@inproceedings{DeterdingTippkoetterUlber2006, author = {Deterding, A. and Tippk{\"o}tter, Nils and Ulber, R.}, title = {Online-Essigs{\"a}ureanalytik in Fermentationsbr{\"u}hen mittels Fließdiffusionstechnik (FDT)}, series = {Technische Systeme f{\"u}r Biotechnologie und Umwelt : 13. Heiligenst{\"a}dter Kolloquium, Heilbad Heiligenstadt, 25.09. - 27.09.2006}, booktitle = {Technische Systeme f{\"u}r Biotechnologie und Umwelt : 13. Heiligenst{\"a}dter Kolloquium, Heilbad Heiligenstadt, 25.09. - 27.09.2006}, editor = {Beckmann, Dieter}, address = {Heiligenstadt}, organization = {Institut f{\"u}r Bioprozeß- und Analysenmeßtechnik}, isbn = {978-3-00-018621-9}, pages = {273 -- 280}, year = {2006}, language = {de} } @article{WerkhausenAlbrachtCroninetal.2017, author = {Werkhausen, Amelie and Albracht, Kirsten and Cronin, Neil J. and Meier, Rahel and Mojsen-Moeller, Jens and Seynnes, Olivier R.}, title = {Modulation of muscle-tendon interaction in the human triceps surae during an energy dissipation task}, series = {Journal of Experimental Biology}, volume = {220}, journal = {Journal of Experimental Biology}, number = {22}, issn = {0022-0949}, doi = {10.1242/jeb.164111}, pages = {4141 -- 4149}, year = {2017}, language = {en} } @article{DemmerChowdhurySelmeretal.2017, author = {Demmer, Julius K. and Chowdhury, Nilanjan Pal and Selmer, Thorsten and Ermler, Ulrich and Buckel, Wolfgang}, title = {The semiquinone swing in the bifurcating electron transferring flavoprotein/butyryl-CoA dehydrogenase complex from Clostridium difficile}, series = {Nature Communications}, volume = {8}, journal = {Nature Communications}, number = {1}, issn = {2041-1723}, doi = {10.1038/s41467-017-01746-3}, pages = {1 -- 10}, year = {2017}, language = {en} } @article{BreuerMangSchoeningetal.2017, author = {Breuer, Lars and Mang, Thomas and Sch{\"o}ning, Michael Josef and Thoelen, Ronald and Wagner, Torsten}, title = {Investigation of the spatial resolution of a laser-based stimulation process for light-addressable hydrogels with incorporated graphene oxide by means of IR thermography}, series = {Sensors and Actuators A: Physical}, volume = {268}, journal = {Sensors and Actuators A: Physical}, publisher = {Elsevier}, address = {Amsterdam}, issn = {0924-4247}, doi = {10.1016/j.sna.2017.11.031}, pages = {126 -- 132}, year = {2017}, language = {en} } @article{UlberTippkoetter2009, author = {Ulber, Roland and Tippk{\"o}tter, Nils}, title = {Nitratfreie Molke}, series = {Rundschau f{\"u}r Fleischhygiene und Lebensmittel{\"u}berwachung}, journal = {Rundschau f{\"u}r Fleischhygiene und Lebensmittel{\"u}berwachung}, number = {4}, pages = {150 -- 152}, year = {2009}, language = {de} } @article{TippkoetterStueckmannKrolletal.2009, author = {Tippk{\"o}tter, Nils and St{\"u}ckmann, Henning and Kroll, Stephen and Winkelmann, Gunda and Noack, Udo and Scheper, Thomas and Ulber, Roland}, title = {A semi-quantitative dipstick assay for microcystin}, series = {Analytical and Bioanalytical Chemistry}, volume = {394}, journal = {Analytical and Bioanalytical Chemistry}, number = {3}, publisher = {springer}, address = {Berlin}, issn = {1618-2650}, doi = {10.1007/s00216-009-2750-8}, pages = {863 -- 869}, year = {2009}, abstract = {An immunochromatographic lateral flow dipstick assay for the fast detection of microcystin-LR was developed. Colloid gold particles with diameters of 40 nm were used as red-colored antibody labels for the visual detection of the antigen. The new dipstick sensor is capable of detecting down to 5 µg·l-1 (ppb; total inversion of the color signal) or 1 ppb (observation of color grading) of microcystin-LR. The course of the labeling reaction was observed via spectrometric wave shifts caused by the change of particle size during the binding of antibodies. Different stabilizing reagents showed that especially bovine serum albumin (BSA) and casein increase the assays sensitivity and the conjugate stability. Performance of the dipsticks was quantified by pattern processing of capture zone CCD images. Storage stability of dipsticks and conjugate suspensions over 115 days under different conditions were monitored. The ready-to-use dipsticks were successfully tested with microcystin-LR-spiked samples of outdoor drinking- and salt water and applied to the tissue of microcystin-fed mussels.}, language = {en} } @article{UlberTippkoetterBuchholzetal.2008, author = {Ulber, R. and Tippk{\"o}tter, Nils and Buchholz, H. and Demmer, W. and Scheper, T.}, title = {Innovative Verfahren in der Molkeaufarbeitung zur Gewinnung neuer Produkte}, series = {Deutsche Milchwirtschaft}, volume = {59}, journal = {Deutsche Milchwirtschaft}, number = {19}, issn = {0012-0480}, pages = {704 -- 706}, year = {2008}, language = {de} } @article{TippkoetterRoikaewUlber2008, author = {Tippk{\"o}tter, Nils and Roikaew, W. and Ulber, R.}, title = {Nitrate removal from whey concentrate with biotechnological regeneration of the waste water}, series = {European dairy magazine : EDM}, journal = {European dairy magazine : EDM}, number = {1}, isbn = {0936-6318}, pages = {30 -- 32}, year = {2008}, language = {en} } @article{TippkoetterRoikaewUlber2007, author = {Tippk{\"o}tter, Nils and Roikaew, N. and Ulber, R.}, title = {Nitratentfernung aus Molkekonzentrat mit biotechnologischer Regeneration der Abw{\"a}sser}, series = {Deutsche Milchwirtschaft}, volume = {58}, journal = {Deutsche Milchwirtschaft}, number = {15}, issn = {0012-0480}, pages = {540 -- 542}, year = {2007}, language = {de} } @misc{StadtmuellerTippkoetterUlber2013, author = {Stadtm{\"u}ller, Ralf and Tippk{\"o}tter, Nils and Ulber, Roland}, title = {A method for production of single-stranded nucleic acids [Europ{\"a}ische Patentanmeldung]}, publisher = {Europ{\"a}isches Patentamt}, address = {Den Hague}, pages = {14 Seiten}, year = {2013}, language = {en} } @misc{AlKaidyTippkoetterUlber2013, author = {Al-Kaidy, Huschyar and Tippk{\"o}tter, Nils and Ulber, Roland}, title = {A system and a method for the implementation of chemical, biological or physical reactions [Europ{\"a}ische Patentanmeldung]}, publisher = {Europ{\"a}isches Patentamt}, address = {Den Hague}, pages = {16 Seiten}, year = {2013}, abstract = {The invention relates to a system for the implementation of chemical, biological or physical reactions, consisting of - one or more magnetic micro-reactors, each comprising a shell made of hydrophobic magnetic nanoparticles encapsulating an aqueous core, - a plane platform comprising a surface to receive the micro-reactors, - a source that generates a magnetic field above or underneath the platform for manipulating the one or more hydrophobic magnetic micro-reactors, or for moving them along the surface of the platform from one position to another position, characterized in that the aqueous core of the one or more magnetic micro-reactors contains a reaction solution or buffer, and wherein the magnetic field generated by the source correlates to a defined position on the surface of the platform.}, language = {en} } @misc{AlKaidyTippkoetterUlber2014, author = {Al-Kaidy, Huschyar and Tippk{\"o}tter, Nils and Ulber, Roland}, title = {Vorrichtung und Verfahren zur Bestimmung des Kontaktwinkels eines fl{\"u}ssigen oder mit Fl{\"u}ssigkeit gef{\"u}llten K{\"o}rpers [Offenlegungsschrift]}, publisher = {Deutsches Patent- und Markenamt}, address = {M{\"u}nchen}, pages = {13 Seiten}, year = {2014}, abstract = {Die vorliegende Erfindung betrifft eine Vorrichtung und ein Verfahren zur Bestimmung des Kontaktwinkels eines fl{\"u}ssigen oder mit Fl{\"u}ssigkeit gef{\"u}llten K{\"o}rpers. Dieser besteht aus einem Tr{\"a}ger (1) und einer damit verbundenen, in einem Winkelbereich von mehr als 0° bis maximal 90° neigbaren Ebene (8) mit einer darin ausgebildeten Abrollbahn (9) f{\"u}r den fl{\"u}ssigen oder mit Fl{\"u}ssigkeit gef{\"u}llten K{\"o}rper. An der Ebene (8) sind mehrere Sensoren (11, 12) zur Erfassung der Rolldauer des K{\"o}rpers entlang der Rollstrecke angeordnet. Erfindungsgem{\"a}ß ist vorgesehen, dass die Einstellung des Neigungswinkels der Ebene (8) {\"u}ber ein Winkelmessger{\"a}t (10) erfolgt, wodurch ein Abrollwinkel erfassbar ist, bei dem der K{\"o}rper in Bewegung ger{\"a}t. Aus der Rolldauer, der Rollstrecke und dem Abrollwinkel wird der Kontaktwinkel des K{\"o}rpers ermittelt.}, language = {de} } @inproceedings{SiekerDuwePothetal.2012, author = {Sieker, T. and Duwe, A. and Poth, S. and Tippk{\"o}tter, Nils and Ulber, R.}, title = {Herstellung von Itacons{\"a}ure aus Buchenholzhydrolysaten}, series = {Kurzfassungsband / GVC-DECHEMA Vortrags- und Diskussionstagung Biopharmazeutische Produktion : 14. - 16. Mai 2012. Konzerthaus Freibung}, booktitle = {Kurzfassungsband / GVC-DECHEMA Vortrags- und Diskussionstagung Biopharmazeutische Produktion : 14. - 16. Mai 2012. Konzerthaus Freibung}, publisher = {DECHEMA}, address = {Frankfurt, M.}, pages = {57}, year = {2012}, language = {de} } @inproceedings{WulfhorstDuweMoehringetal.2016, author = {Wulfhorst, H. and Duwe, A. and M{\"o}hring, S. and Jurca, O. and Tippk{\"o}tter, Nils}, title = {Analysis of pretreated biomass by differential scanning 132 calorimetry and multivariate data analysis}, series = {New frontiers of biotech-processes (Himmelfahrtstagung) : 02-04 May 2016, Rhein-Mosel-Halle, Koblenz/Germany}, booktitle = {New frontiers of biotech-processes (Himmelfahrtstagung) : 02-04 May 2016, Rhein-Mosel-Halle, Koblenz/Germany}, publisher = {DECHEMA}, address = {Frankfurt am Main}, pages = {132}, year = {2016}, language = {en} } @inproceedings{CapitainHeringTippkoetteretal.2016, author = {Capitain, C. and Hering, T. and Tippk{\"o}tter, Nils and Ulber, R.}, title = {Enzymatic polymerization of lignin model compounds and solubilized lignin in an aqueous ethanol extract}, series = {New frontiers of biotech-processes (Himmelfahrtstagung) : 02-04 May 2016, Rhein-Mosel-Halle, Koblenz/Germany}, booktitle = {New frontiers of biotech-processes (Himmelfahrtstagung) : 02-04 May 2016, Rhein-Mosel-Halle, Koblenz/Germany}, publisher = {DECHEMA}, address = {Frankfurt am Main}, pages = {151 -- 152}, year = {2016}, language = {en} } @inproceedings{MoehringWulfhorstRothetal.2016, author = {M{\"o}hring, S. and Wulfhorst, H. and Roth, J. and Tippk{\"o}tter, Nils}, title = {Pretreatment strategies for lignocellulosic biomass}, series = {New frontiers of biotech-processes (Himmelfahrtstagung) : 02-04 May 2016, Rhein-Mosel-Halle, Koblenz/Germany}, booktitle = {New frontiers of biotech-processes (Himmelfahrtstagung) : 02-04 May 2016, Rhein-Mosel-Halle, Koblenz/Germany}, publisher = {DECHEMA}, address = {Frankfurt am Main}, pages = {131}, year = {2016}, language = {en} } @inproceedings{RothMoehringTippkoetter2016, author = {Roth, J. and M{\"o}hring, S. and Tippk{\"o}tter, Nils}, title = {Characterization and evaluation of lignocellulosic biomass 130 hydrolysates for ABE fermentation}, series = {New frontiers of biotech-processes (Himmelfahrtstagung) : 02-04 May 2016, Rhein-Mosel-Halle, Koblenz/Germany}, booktitle = {New frontiers of biotech-processes (Himmelfahrtstagung) : 02-04 May 2016, Rhein-Mosel-Halle, Koblenz/Germany}, publisher = {DECHEMA}, address = {Frankfurt am Main}, pages = {130}, year = {2016}, language = {en} } @inproceedings{HeringUlberTippkoetter2016, author = {Hering, T. and Ulber, Roland and Tippk{\"o}tter, Nils}, title = {Development of a screening system for antimicrobial surfaces}, series = {New frontiers of biotech-processes (Himmelfahrtstagung) : 02-04 May 2016, Rhein-Mosel-Halle, Koblenz/Germany}, booktitle = {New frontiers of biotech-processes (Himmelfahrtstagung) : 02-04 May 2016, Rhein-Mosel-Halle, Koblenz/Germany}, publisher = {DECHEMA}, address = {Frankfurt am Main}, pages = {129}, year = {2016}, language = {en} } @inproceedings{EngelThieringerTippkoetter2016, author = {Engel, M. and Thieringer, J. and Tippk{\"o}tter, Nils}, title = {Microbial electrosynthesis for sustainable biobutanol production}, series = {New frontiers of biotech-processes (Himmelfahrtstagung) : 02-04 May 2016, Rhein-Mosel-Halle, Koblenz/Germany}, booktitle = {New frontiers of biotech-processes (Himmelfahrtstagung) : 02-04 May 2016, Rhein-Mosel-Halle, Koblenz/Germany}, publisher = {DECHEMA}, address = {Frankfurt am Main}, pages = {77 -- 78}, year = {2016}, language = {en} } @article{SeifarthGrosseGrossmannetal.2017, author = {Seifarth, Volker and Grosse, Joachim O. and Grossmann, Matthias and Janke, Heinz Peter and Arndt, Patrick and Koch, Sabine and Epple, Matthias and Artmann, Gerhard and Temiz Artmann, Ayseg{\"u}l}, title = {Mechanical induction of bi-directional orientation of primary porcine bladder smooth muscle cells in tubular fibrin-poly(vinylidene fluoride) scaffolds for ureteral and urethral repair using cyclic and focal balloon catheter stimulation}, series = {Journal of Biomaterials Applications}, volume = {32}, journal = {Journal of Biomaterials Applications}, number = {3}, publisher = {Sage}, address = {London}, issn = {1530-8022}, doi = {10.1177/0885328217723178}, pages = {321 -- 330}, year = {2017}, language = {en} } @article{PilasYaziciSelmeretal.2017, author = {Pilas, Johanna and Yazici, Yasemen and Selmer, Thorsten and Keusgen, Michael and Sch{\"o}ning, Michael Josef}, title = {Optimization of an amperometric biosensor array for simultaneous measurement of ethanol, formate, d- and l-lactate}, series = {Electrochimica Acta}, volume = {251}, journal = {Electrochimica Acta}, publisher = {Elsevier}, address = {Amsterdam}, issn = {0013-4686}, doi = {10.1016/j.electacta.2017.07.119}, pages = {256 -- 262}, year = {2017}, abstract = {The immobilization of NAD+-dependent dehydrogenases, in combination with a diaphorase, enables the facile development of multiparametric sensing devices. In this work, an amperometric biosensor array for simultaneous determination of ethanol, formate, d- and l-lactate is presented. Enzyme immobilization on platinum thin-film electrodes was realized by chemical cross-linking with glutaraldehyde. The optimization of the sensor performance was investigated with regard to enzyme loading, glutaraldehyde concentration, pH, cofactor concentration and temperature. Under optimal working conditions (potassium phosphate buffer with pH 7.5, 2.5 mmol L-1 NAD+, 2.0 mmol L-1 ferricyanide, 25 °C and 0.4\% glutaraldehyde) the linear working range and sensitivity of the four sensor elements was improved. Simultaneous and cross-talk free measurements of four different metabolic parameters were performed successfully. The reliable analytical performance of the biosensor array was demonstrated by application in a clarified sample of inoculum sludge. Thereby, a promising approach for on-site monitoring of fermentation processes is provided.}, language = {en} } @article{RoehlenPilasSchoeningetal.2017, author = {R{\"o}hlen, Desiree and Pilas, Johanna and Sch{\"o}ning, Michael Josef and Selmer, Thorsten}, title = {Development of an amperometric biosensor platform for the combined determination of l-Malic, Fumaric, and l-Aspartic acid}, series = {Applied Biochemistry and Biotechnology}, volume = {183}, journal = {Applied Biochemistry and Biotechnology}, publisher = {Springer}, address = {Berlin}, issn = {1559-0291}, doi = {10.1007/s12010-017-2578-1}, pages = {566 -- 581}, year = {2017}, abstract = {Three amperometric biosensors have been developed for the detection of L-malic acid, fumaric acid, and L -aspartic acid, all based on the combination of a malate-specific dehydrogenase (MDH, EC 1.1.1.37) and diaphorase (DIA, EC 1.8.1.4). The stepwise expansion of the malate platform with the enzymes fumarate hydratase (FH, EC 4.2.1.2) and aspartate ammonia-lyase (ASPA, EC 4.3.1.1) resulted in multi-enzyme reaction cascades and, thus, augmentation of the substrate spectrum of the sensors. Electrochemical measurements were carried out in presence of the cofactor β-nicotinamide adenine dinucleotide (NAD+) and the redox mediator hexacyanoferrate (III) (HCFIII). The amperometric detection is mediated by oxidation of hexacyanoferrate (II) (HCFII) at an applied potential of + 0.3 V vs. Ag/AgCl. For each biosensor, optimum working conditions were defined by adjustment of cofactor concentrations, buffer pH, and immobilization procedure. Under these improved conditions, amperometric responses were linear up to 3.0 mM for L-malate and fumarate, respectively, with a corresponding sensitivity of 0.7 μA mM-1 (L-malate biosensor) and 0.4 μA mM-1 (fumarate biosensor). The L-aspartate detection system displayed a linear range of 1.0-10.0 mM with a sensitivity of 0.09 μA mM-1. The sensor characteristics suggest that the developed platform provides a promising method for the detection and differentiation of the three substrates.}, language = {en} } @article{MuschallikMolinnusBongaertsetal.2017, author = {Muschallik, Lukas and Molinnus, Denise and Bongaerts, Johannes and Pohl, Martina and Wagner, Torsten and Sch{\"o}ning, Michael Josef and Siegert, Petra and Selmer, Thorsten}, title = {(R,R)-Butane-2,3-diol Dehydrogenase from Bacillus clausii DSM 8716T: Cloning and Expression of the bdhA-Gene, and Initial Characterization of Enzyme}, series = {Journal of Biotechnology}, volume = {258}, journal = {Journal of Biotechnology}, publisher = {Elsevier}, address = {Amsterdam}, issn = {0168-1656}, doi = {10.1016/j.jbiotec.2017.07.020}, pages = {41 -- 50}, year = {2017}, abstract = {The gene encoding a putative (R,R)-butane-2,3-diol dehydrogenase (bdhA) from Bacillus clausii DSM 8716T was isolated, sequenced and expressed in Escherichia coli. The amino acid sequence of the encoded protein is only distantly related to previously studied enzymes (identity 33-43\%) and exhibited some uncharted peculiarities. An N-terminally StrepII-tagged enzyme variant was purified and initially characterized. The isolated enzyme catalyzed the (R)-specific oxidation of (R,R)- and meso-butane-2,3-diol to (R)- and (S)-acetoin with specific activities of 12 U/mg and 23 U/mg, respectively. Likewise, racemic acetoin was reduced with a specific activity of up to 115 U/mg yielding a mixture of (R,R)- and meso-butane-2,3-diol, while the enzyme reduced butane-2,3-dione (Vmax 74 U/mg) solely to (R,R)-butane-2,3-diol via (R)-acetoin. For these reactions only activity with the co-substrates NADH/NAD+ was observed. The enzyme accepted a selection of vicinal diketones, α-hydroxy ketones and vicinal diols as alternative substrates. Although the physiological function of the enzyme in B. clausii remains elusive, the data presented herein clearly demonstrates that the encoded enzyme is a genuine (R,R)-butane-2,3-diol dehydrogenase with potential for applications in biocatalysis and sensor development.}, language = {en} } @article{TippkoetterDuweWiesenetal.2014, author = {Tippk{\"o}tter, Nils and Duwe, Anna-Maria and Wiesen, Sebastian and Sieker, Tim and Ulber, Roland}, title = {Enzymatic hydrolysis of beech wood lignocellulose at high solid contents and its utilization as substrate for the production of biobutanol and dicarboxylic acids}, series = {Bioresource Technology}, volume = {167}, journal = {Bioresource Technology}, publisher = {Elsevier}, address = {Amsterdam}, doi = {10.1016/j.biortech.2014.06.052}, pages = {447 -- 455}, year = {2014}, abstract = {The development of a cost-effective hydrolysis for crude cellulose is an essential part of biorefinery developments. To establish such high solid hydrolysis, a new solid state reactor with static mixing is used. However, concentrations >10\% (w/w) cause a rate and yield reduction of enzymatic hydrolysis. By optimizing the synergetic activity of cellulolytic enzymes at solid concentrations of 9\%, 17\% and 23\% (w/w) of crude Organosolv cellulose, glucose concentrations of 57, 113 and 152 g L⁻¹ are reached. However, the glucose yield decreases from 0.81 to 0.72gg⁻¹ at 17\% (w/w). Optimal conditions for hydrolysis scale-up under minimal enzyme addition are identified. As result, at 23\% (w/w) crude cellulose the glucose yield increases from 0.29 to 0.49gg⁻¹. As proof of its applicability, biobutanol, succinic and itaconic acid are produced with the crude hydrolysate. The potential of the substrate is proven e.g. by a high butanol yield of 0.33gg⁻¹.}, language = {en} } @article{WiesenTippkoetterMuffleretal.2015, author = {Wiesen, Sebastian and Tippk{\"o}tter, Nils and Muffler, Kai and Suck, Kirstin and Sohling, Ulrich and Ruf, Friedrich and Ulber, Roland}, title = {Adsorption of fatty acids to layered double hydroxides in aqueous systems}, series = {Adsorption}, volume = {21}, journal = {Adsorption}, number = {6-7}, publisher = {Springer}, address = {Berlin}, pages = {459 -- 466}, year = {2015}, abstract = {Due to their anion exchange characteristics, layered double hydroxides (LDHs) are suitable for the detoxification of aqueous, fatty acid containing fermentation substrates. The aim of this study is to examine the adsorption mechanism, using crude glycerol from plant oil esterification as a model system. Changes in the intercalation structure in relation to the amount of fatty acids adsorbed are monitored by X-ray diffraction and infra-red spectroscopy. Additionally, calcination of LDH is investigated in order to increase the binding capacity for fatty acids. Our data propose that, at ambient temperature, fatty acids can be bound to the hydrotalcite by adsorption or in addition by intercalation, depending on fatty acid concentration. The adsorption of fatty acids from crude glycerol shows a BET-like behavior. Above a fatty acid concentration of 3.5 g L-1, intercalation of fatty acids can be shown by the appearance of an increased interlayer spacing. This observation suggests a two phase adsorption process. Calcination of LDHs allows increasing the binding capacity for fatty acids by more than six times, mainly by reduction of structural CO32-.}, language = {en} } @article{WulfhorstDuweMerseburgetal.2016, author = {Wulfhorst, Helene and Duwe, Anna-Maria and Merseburg, Johannes and Tippk{\"o}tter, Nils}, title = {Compositional analysis of pretreated (beech) wood using differential scanning calorimetry and multivariate data analysis}, series = {Tetrahedron}, volume = {72}, journal = {Tetrahedron}, number = {46}, publisher = {Elsevier}, address = {Amsterdam}, doi = {10.1016/j.tet.2016.04.029}, pages = {7329 -- 7334}, year = {2016}, abstract = {The composition of plant biomass varies depending on the feedstock and pre-treatment conditions and influences its processing in biorefineries. In order to ensure optimal process conditions, the quantitative proportion of the main polymeric components of the pre-treated biomass has to be determined. Current standard procedures for biomass compositional analysis are complex, the measurements are afflicted with errors and therefore often not comparable. Hence, new powerful analytical methods are urgently required to characterize biomass. In this contribution, Differential Scanning Calorimetry (DSC) was applied in combination with multivariate data analysis (MVA) to detect the cellulose content of the plant biomass pretreated by Liquid Hot Water (LHW) and Organosolv processes under various conditions. Unlike conventional techniques, the developed analytic method enables the accurate quantification of monosaccharide content of the plant biomass without any previous sample preparation. It is easy to handle and avoids errors in sample preparation.}, language = {en} } @article{AlKaidyKuthanHeringetal.2016, author = {Al-Kaidy, Huschyar and Kuthan, Kai and Hering, Thomas and Tippk{\"o}tter, Nils}, title = {Aqueous droplets used as enzymatic microreactors and their electromagnetic actuation}, series = {Journal of Visualized Experiments}, journal = {Journal of Visualized Experiments}, number = {Issue 126}, issn = {1940-087X}, doi = {10.3791/54643}, year = {2016}, abstract = {For the successful implementation of microfluidic reaction systems, such as PCR and electrophoresis, the movement of small liquid volumes is essential. In conventional lab-on-a-chip-platforms, solvents and samples are passed through defined microfluidic channels with complex flow control installations. The droplet actuation platform presented here is a promising alternative. With it, it is possible to move a liquid drop (microreactor) on a planar surface of a reaction platform (lab-in-a-drop). The actuation of microreactors on the hydrophobic surface of the platform is based on the use of magnetic forces acting on the outer shell of the liquid drops which is made of a thin layer of superhydrophobic magnetite particles. The hydrophobic surface of the platform is needed to avoid any contact between the liquid core and the surface to allow a smooth movement of the microreactor. On the platform, one or more microreactors with volumes of 10 µL can be positioned and moved simultaneously. The platform itself consists of a 3 x 3 matrix of electrical double coils which accommodate either neodymium or iron cores. The magnetic field gradients are automatically controlled. By variation of the magnetic field gradients, the microreactors' magnetic hydrophobic shell can be manipulated automatically to move the microreactor or open the shell reversibly. Reactions of substrates and corresponding enzymes can be initiated by merging the microreactors or bringing them into contact with surface immobilized catalysts.}, language = {en} } @article{SiekerUlberDimitrovaetal.2009, author = {Sieker, Tim and Ulber, Roland and Dimitrova, Darina and Bart, Hans-J{\"o}rg and Neuner, Andreas and Heinzle, Elmar and Tippk{\"o}tter, Nils}, title = {Silage : Fermentationsrohstoff f{\"u}r die chemische Industrie?}, series = {labor\&more}, journal = {labor\&more}, number = {2}, pages = {44 -- 45}, year = {2009}, abstract = {In Anbetracht des zu erwartenden R{\"u}ckgangs der Verf{\"u}gbarkeit fossiler Rohstoffe m{\"u}ssen nicht nur f{\"u}r den Energiesektor, sondern auch f{\"u}r die Herstellung industrieller Produkte alternative Rohstoffe gefunden werden. Ein Beispiel f{\"u}r einen nicht in Nahrungsmittelkonkurrenz stehenden nachwachsenden Rohstoff ist gr{\"u}ne Biomasse wie Gras und Klee. Diese lassen sich in Deutschland auf großen Fl{\"a}chen anbauen und enthalten eine Vielzahl potenzieller Substrate f{\"u}r Fermentationen.}, language = {de} } @article{TippkoetterWollnyKampeisetal.2011, author = {Tippk{\"o}tter, Nils and Wollny, S. and Kampeis, P. and Oster, J. and Schneider, H. and Ulber, R.}, title = {Magnetseparation von Proteinen : Separation von Zielmolek{\"u}len durch hochselektive Aptamere}, series = {GIT Labor-Fachzeitschrift}, volume = {55}, journal = {GIT Labor-Fachzeitschrift}, number = {10}, publisher = {Wiley}, address = {Weinheim}, pages = {666}, year = {2011}, abstract = {Durch die Kombination von Oligonukleotid-Liganden (Aptameren) hoher Bindungsaffinit{\"a}ten mit hochselektiv abtrennbaren magnetisierbaren Mikropartikeln wird eine einstufige Separation von Zielmolek{\"u}len aus mikrobiologischen Produktionsans{\"a}tzen m{\"o}glich. Die Aptamere werden hierf{\"u}r reversibel auf den Partikeloberfl{\"a}chen gebunden und f{\"u}r die spezifische Isolierung von Bioprodukten eingesetzt. Die Abtrennung der beladenen Partikel erfolgt durch einen neuen Rotor-Stator-Separator mit Hochgradient-Magnetfeld.}, language = {de} } @inproceedings{PothMonzonTippkoetteretal.2010, author = {Poth, Sebastian and Monzon, Magaly and Tippk{\"o}tter, Nils and Ulber, Roland}, title = {Lignocellulosic biorefinery : process integration of hydrolysis and fermentation}, series = {Proceedings / 11th European Workshop on Lignocellulosics and Pulp : August 16 - 19, 2010, Hamburg, Germany}, booktitle = {Proceedings / 11th European Workshop on Lignocellulosics and Pulp : August 16 - 19, 2010, Hamburg, Germany}, publisher = {vTi}, address = {Hamburg}, pages = {65 -- 68}, year = {2010}, language = {en} } @book{Tippkoetter2010, author = {Tippk{\"o}tter, Nils}, title = {Reaktionssysteme zur Aufarbeitung und Umsetzung nachwachsender Rohstoffe : Einsatz chromatographischer Verfahren sowie Membran- und Festbettreaktoren zur Verarbeitung von Molke, St{\"a}rke und Cellulose}, publisher = {Logos-Verlag}, address = {Berlin}, isbn = {978-3-8325-2717-4}, pages = {III, 269 Seiten}, year = {2010}, language = {de} } @incollection{MufflerTippkoetterUlber2010, author = {Muffler, Kai and Tippk{\"o}tter, Nils and Ulber, Roland}, title = {Chemical feedstocks and fine chemicals from other substrates}, series = {Handbook of hydrocarbon and lipid microbiology. Volume 4: Consequences of microbial interactions with hydrocarbons, oils and lipids. - (Springer reference)}, booktitle = {Handbook of hydrocarbon and lipid microbiology. Volume 4: Consequences of microbial interactions with hydrocarbons, oils and lipids. - (Springer reference)}, editor = {Timmis, Kenneth N.}, publisher = {Springer}, address = {Berlin [u.a.]}, isbn = {978-3-540-77588-1}, doi = {10.1007\%2F978-3-540-77587-4_214}, pages = {2891 -- 2902}, year = {2010}, language = {en} } @incollection{MufflerPothSiekeretal.2011, author = {Muffler, Kai and Poth, Sabastian and Sieker, Tim and Tippk{\"o}tter, Nils and Ulber, Roland and Sell, Dieter}, title = {Bio-feedstocks}, series = {Comprehensive biotechnology : principles and practices in industry, agcriculture, medicine and the environment. Volume 2: Engineering fundamentals of biotechnology}, booktitle = {Comprehensive biotechnology : principles and practices in industry, agcriculture, medicine and the environment. Volume 2: Engineering fundamentals of biotechnology}, editor = {Moo-Young, Murray}, edition = {2. edition}, publisher = {Elsevier}, address = {Amsterdam}, isbn = {978-0-444-53352-4}, doi = {10.1016/B978-0-08-088504-9.00088-X}, pages = {93 -- 101}, year = {2011}, language = {en} } @incollection{HahnKellyMuffleretal.2011, author = {Hahn, Thomas and Kelly, Svenja and Muffler, Kai and Tippk{\"o}tter, Nils and Ulber, Roland}, title = {Extraction of lignocellulose and algae for the production of bulk and fine chemicals}, series = {Industrial scale natural products extraction}, booktitle = {Industrial scale natural products extraction}, editor = {Hans-J{\"o}rg, Bart and Pilz, Stephan}, publisher = {Wiley-VCH}, address = {Weinheim}, isbn = {978-3-527-32504-7 (Print)}, doi = {10.1002/9783527635122}, pages = {221 -- 245}, year = {2011}, language = {en} } @incollection{Tippkoetter2016, author = {Tippk{\"o}tter, Nils}, title = {Grundlagen der bio-chemischen Umwandlung}, series = {Energie aus Biomasse : Grundlagen, Techniken und Verfahren}, booktitle = {Energie aus Biomasse : Grundlagen, Techniken und Verfahren}, editor = {Kaltschmidt, Martin}, edition = {3., aktualisierte, erweiterte Auflage}, publisher = {Springer Vieweg}, address = {Berlin ; Heidelberg}, isbn = {978-3-662-47437-2 (Print)}, doi = {10.1007/978-3-662-47438-9}, pages = {1447 -- 1500}, year = {2016}, language = {de} } @article{KapplerTanudyayaSchmittTippkoetteretal.2007, author = {Kappler-Tanudyaya, Nathalie and Schmitt, Heike and Tippk{\"o}tter, Nils and Meyer, Lina and Lenzen, Sigurd and Ulber, Roland}, title = {Combination of biotransformation and chromatography for the isolation and purification of mannoheptulose}, series = {Biotechnology Journal}, volume = {2}, journal = {Biotechnology Journal}, number = {6}, issn = {1860-7314}, doi = {10.1002/biot.200700004}, pages = {692 -- 699}, year = {2007}, abstract = {Mannoheptulose is a seven-carbon sugar. It is an inhibitor of glucose-induced insulin secretion due to its ability to selectively inhibit the enzyme glucokinase. An improved procedure for mannoheptulose isolation from avocados is described in this study (based upon the original method by La Forge). The study focuses on the combination of biotransformation and downstream processing (preparative chromatography) as an efficient method to produce a pure extract of mannoheptulose. The experiments were divided into two major phases. In the first phase, several methods and parameters were compared to optimize the mannoheptulose extraction with respect to efficiency and purity. In the second phase, a mass balance of mannoheptulose over the whole extraction process was undertaken to estimate the yield and efficiency of the total extraction process. The combination of biotransformation and preparative chromatography allowed the production of a pure mannoheptulose extract. In a biological test, the sugar inhibited the glucokinase enzyme activity efficiently.}, language = {en} } @article{TippkoetterDeterdingUlber2008, author = {Tippk{\"o}tter, Nils and Deterding, A. and Ulber, Roland}, title = {Determination of acetic acid in fermentation broth by gas-diffusion technique}, series = {Engineering in Life Sciences}, volume = {8}, journal = {Engineering in Life Sciences}, number = {1, Special Issue: Technical Systems for the Use in Life Sciences}, doi = {10.1002/elsc.200820227}, pages = {62 -- 67}, year = {2008}, abstract = {Due to the interfering effects of acetic acid in many fermentation processes, a gas-diffusion technique was developed for the online determination of acetic acid. The measurements were accomplished with a flow diffusion analysis (FDA) unit from the TRACE Analytics GmbH, Braunschweig, Germany. The diffusion analysis is based on the UV-absorbance of acetic acid at 205 nm. The measurement was achieved by the separation of an acceptor and a carrier stream (acidified fermentation broth) using a gas permeable polytetrafluoroethylene (PTFE) membrane, whereby broth constituents that would otherwise disturb the UV-measurement of acetic acid, are held back efficiently. Merely, the fermentation by-products, e.g. formic acid, is capable of diffusing through the membrane. While formic acid can disturb the measurement, carbon dioxide does not absorb at 205 nm. The method operates with time-dependent sample enrichment. During the analysis, a small volume of the acceptor stream is stopped for a defined time interval in the acceptor chamber. During this period, the gaseous acetic acid diffuses through the membrane and is enriched in the acceptor chamber. Subsequently after the enrichment, the acceptor stream flows through a UV-detector. The intensity of the signal is proportional to the acetic acid concentration. Online measurements in bioreactors via a sterile filtration probe have been accomplished. A linear calibration in the range of 0.5-5.0 g/L acetic acid with a relative standard deviation of <5 \% was obtained. A sampling rate of 8 samples per hour was possible. The system was applied for the determination of acetic acid in E. coli fermentation broth. The instrument is easy to clean, very user-friendly and does not require any toxic or expensive reagents.}, language = {en} } @article{GrafSteinhofLotzetal.2009, author = {Graf, Alain-Michel and Steinhof, Rafael and Lotz, Martin and Tippk{\"o}tter, Nils and Kasper, Cornelia and Beutel, Sascha and Ulber, Roland}, title = {Downstream-Processing mit Membranadsorbern zur Isolierung nativer Proteinfraktionen aus Kartoffelfruchtwasser}, series = {Chemie Ingenieur Technik}, volume = {81}, journal = {Chemie Ingenieur Technik}, number = {3}, publisher = {Wiley}, address = {Weinheim}, doi = {10.1002/cite.200800139}, pages = {267 -- 274}, year = {2009}, abstract = {Bei der St{\"a}rkeproduktion entstehendes Kartoffelfruchtwasser besitzt mit 2 - 3 \% einen hohen Anteil an ern{\"a}hrungsphysiologisch interessanten Proteinen. Die industrielle Gewinnung dieser Proteinfracht liefert jedoch lediglich ein minderwertiges, denaturiertes Produkt. Mit Hilfe der Membranadsorber-Technologie lassen sich aus Kartoffelfruchtwasser unter milden Reaktionsbedingungen native bioaktive Proteinfraktionen gewinnen. Geeignete Trennbedingungen wurden im Labormaßstab entwickelt und in den Technikumsmaßstab {\"u}bertragen. An Anionenaustauscher-Membranadsorbern mit einer Membranfl{\"a}che von 10 000 cm2 wurde eine Patatinhaltige Fraktion (44 kDa) mit Bindungskapazit{\"a}ten von 0,37 mg/cm2 isoliert. Eine niedermolekulare Proteinfraktion mit Protease-Inhibitoren konnte durch Kationenaustauscher-Membranadsorber mit Bindungskapazit{\"a}ten von 1,00 mg/cm2 gewonnen werden. Sie ist f{\"u}r verschiedenste Applikationen in der pharmazeutischen, kosmetischen und der Nahrungsmittelindustrie interessant z. B. f{\"u}r Appetitz{\"u}gler oder muskelaufbauende Proteinpr{\"a}parate. Der Aufreinigung der nativen Proteinfraktionen durch Ultra-/Diafiltration schließt sich die Konfektionierung durch Spr{\"u}htrocknung an. Die bioanalytische Charakterisierung der Produkte belegt die Reinheit und die enzymatische Aktivit{\"a}t sowie die Abreicherung von St{\"o}rkomponenten wie Glykoalkaloide und Polyphenoloxidasen.}, language = {de} } @article{UlberPothMonzonetal.2010, author = {Ulber, Roland and Poth, Sebastian and Monzon, Magaly and Tippk{\"o}tter, Nils}, title = {Prozessintegration von Hydrolyse und Fermentation von Cellulose- Faserstoff}, series = {Chemie Ingenieur Technik}, volume = {82}, journal = {Chemie Ingenieur Technik}, number = {1-2}, issn = {1522-2640}, doi = {10.1002/cite.200900103}, pages = {135 -- 139}, year = {2010}, abstract = {Ein viel versprechender erneuerbarer Rohstoff f{\"u}r die Produktion von Chemikalien und Treibstoffen ist Lignocellulose aus pflanzlicher Biomasse. Die darin enthaltenen Zucker k{\"o}nnen mittels enzymatischer Hydrolyse freigesetzt und fermentativ zu Ethanol umgesetzt werden. Ein interessanter Ansatz ist dabei die simultane Verzuckerung und Fermentation. Hefen und Enzyme haben mit 30 °C bzw. 50 °C zwar unterschiedliche Temperaturoptima, es konnte aber gezeigt werden, dass auch bei den niedrigeren Temperaturen eine Umsetzung der Cellulose zu Glucose erfolgt, wenn auch langsamer als bei optimalen Bedingungen. Außerdem konnte in Vorversuchen gezeigt werden, dass Ethanol in den zu erwartenden Konzentrationen keinen Einfluss auf die enzymatische Umsetzung hat.}, language = {de} } @article{SiekerNeunerDimitrovaetal.2010, author = {Sieker, Tim and Neuner, Andreas and Dimitrova, Darina and Tippk{\"o}tter, Nils and Bart, Hans-J{\"o}rg and Heinzle, Elmar and Ulber, Roland}, title = {Grassilage als Rohstoff f{\"u}r die chemische Industrie}, series = {Chemie Ingenieur Technik}, volume = {82}, journal = {Chemie Ingenieur Technik}, number = {8, Special Issue: Industrielle Nutzung nachwachsender Rohstoffe}, publisher = {Wiley-VCH}, address = {Weinheim}, issn = {1522-2640}, doi = {10.1002/cite.201000088}, pages = {1153 -- 1159}, year = {2010}, abstract = {Grassilage stellt einen nachwachsenden Rohstoff mit großem Potenzial dar. Neben Cellulose und Hemicellulose enth{\"a}lt sie auch organische S{\"a}uren, insbesondere Milchs{\"a}ure. In einem Bioraffinerie-Projekt wird die Milchs{\"a}ure aus der Silage isoliert und mit gentechnisch optimierten St{\"a}mmen zu L-Lysin weiterverarbeitet. Die Lignocellulose wird hydrolysiert und zu Ethanol fermentiert. Ein besonderes Augenmerk liegt auf der Integration der unterschiedlichen Prozesse sowie der einzelnen Prozessschritte zu einem Gesamtprozess, der s{\"a}mtliche Inhaltsstoffe der Silage verwertet.}, language = {de} } @article{TippkoetterRoikaewUlberetal.2010, author = {Tippk{\"o}tter, Nils and Roikaew, Wipa and Ulber, Roland and Hoffmann, Alexander and Denzler, Hans-J{\"o}rg and Buchholz, Heinrich}, title = {Paracoccus denitrificans for the effluent recycling during continuous denitrification of liquid food}, series = {Biotechnology Progress}, volume = {26}, journal = {Biotechnology Progress}, number = {3}, publisher = {Wiley}, address = {Hoboken, NJ}, issn = {8756-7938}, doi = {10.1002/btpr.384}, pages = {756 -- 762}, year = {2010}, abstract = {Nitrate is an undesirable component of several foods. A typical case of contamination with high nitrate contents is whey concentrate, containing nitrate in concentrations up to 25 l. The microbiological removal of nitrate by Paracoccus denitrificans under formation of harmless nitrogen in combination with a cell retention reactor is described here. Focus lies on the resource-conserving design of a microbal denitrification process. Two methods are compared. The application of polyvinyl alcohol-immobilized cells, which can be applied several times in whey feed, is compared with the implementation of a two step denitrification system. First, the whey concentrate's nitrate is removed by ion exchange and subsequently the eluent regenerated by microorganisms under their retention by crossflow filtration. Nitrite and nitrate concentrations were determined by reflectometric color measurement with a commercially available Reflectoquant® device. Correction factors for these media had to be determined. During the pilot development, bioreactors from 4 to 250 mg·L-1 and crossflow units with membrane areas from 0.02 to 0.80 m2 were examined. Based on the results of the pilot plants, a scaling for the exemplary process of denitrifying 1,000 tons per day is discussed.}, language = {en} } @article{PothMonzonTippkoetteretal.2011, author = {Poth, Sebastian and Monzon, Magaly and Tippk{\"o}tter, Nils and Ulber, Roland}, title = {Lignocellulosic biorefinery: Process integration of hydrolysis and fermentation (SSF process)}, series = {Holzforschung}, volume = {65}, journal = {Holzforschung}, number = {5}, publisher = {De Gruyter}, address = {Berlin}, pages = {633 -- 637}, year = {2011}, abstract = {The aim of the present work is the process integration and the optimization of the enzymatic hydrolysis of wood and the following fermentation of the products to ethanol. The substrate is a fiber fraction obtained by organosolv pre-treatment of beech wood. For the ethanol production, a co-fermentation by two different yeasts (Saccharomyces cerevisiae and Pachysolen tannophilus) was carried out to convert glucose as well as xylose. Two approaches has been followed: 1. A two step process, in which the hydrolysis of the fiber fraction and the fermentation to product are separated from each other. 2. A process, in which the hydrolysis and the fermentation are carried out in one single process step as simultaneous saccharification and fermentation (SSF). Following the first approach, a yield of about 0.15 g ethanol per gram substrate can be reached. Based on the SSF, one process step can be saved, and additionally, the gained yield can be raised up to 0.3 g ethanol per gram substrate.}, language = {en} } @article{SiekerNeunerDimitrovaetal.2011, author = {Sieker, Tim and Neuner, Andreas and Dimitrova, Darina and Tippk{\"o}tter, Nils and Muffler, Kai and Bart, Hans-J{\"o}rg and Heinzle, Elmar and Ulber, Roland}, title = {Ethanol production from grass silage by simultaneous pretreatment, saccharification and fermentation: First steps in the process development}, series = {Engineering in Life Sciences}, volume = {11}, journal = {Engineering in Life Sciences}, number = {4}, publisher = {Wiley}, address = {Weinheim}, doi = {10.1002/elsc.201000160}, pages = {436 -- 442}, year = {2011}, abstract = {Grass silage provides a great potential as renewable feedstock. Two fractions of the grass silage, a press juice and the fiber fraction, were evaluated for their possible use for bioethanol production. Direct production of ethanol from press juice is not possible due to high concentrations of organic acids. For the fiber fraction, alkaline peroxide or enzymatic pretreatment was used, which removes the phenolic acids in the cell wall. In this study, we demonstrate the possibility to integrate the enzymatic pretreatment with a simultaneous saccharification and fermentation to achieve ethanol production from grass silage in a one-process step. Achieved yields were about 53 g ethanol per kg silage with the alkaline peroxide pretreatment and 91 g/kg with the enzymatic pretreatment at concentrations of 8.5 and 14.6 g/L, respectively. Furthermore, it was shown that additional supplementation of the fermentation medium with vitamins, trace elements and nutrient salts is not necessary when the press juice is directly used in the fermentation step.}, language = {en} } @article{TippkoetterAlKaidyWollnyetal.2013, author = {Tippk{\"o}tter, Nils and Al-Kaidy, Huschyar and Wollny, Steffen and Ulber, Roland}, title = {Functionalized magnetizable particles for downstream processing in single-use systems}, series = {Chemie Ingenieur Technik}, volume = {85}, journal = {Chemie Ingenieur Technik}, number = {1-2: Special Issue: Single-Use Technology}, publisher = {Wiley}, address = {Weinheim}, doi = {10.1002/cite.201200130}, pages = {76 -- 86}, year = {2013}, abstract = {Biotechnological downstream processing is usually an elaborate procedure, requiring a multitude of unit operations to isolate the target component. Besides the disadvantageous space-time yield, the risks of cross-contaminations and product loss grow fast with the complexity of the isolation procedure. A significant reduction of unit operations can be achieved by application of magnetic particles, especially if these are functionalized with affinity ligands. As magnetic susceptible materials are highly uncommon in biotechnological processes, target binding and selective separation of such particles from fermentation or reactions broths can be done in a single step. Since the magnetizable particles can be produced from iron salts and low priced polymers, a single-use implementation of these systems is highly conceivable. In this article, the principles of magnetizable particles, their synthesis and functionalization are explained. Furthermore, applications in the area of reaction engineering, microfluidics and downstream processing are discussed focusing on established single-use technologies and development potential.}, language = {en} } @article{ThielTippkoetterSucketal.2013, author = {Thiel, Alexander and Tippk{\"o}tter, Nils and Suck, Kirstin and Sohling, Ulrich and Ruf, Friedrich and Ulber, Roland}, title = {New zeolite adsorbents for downstream processing of polyphenols from renewable resources}, series = {Engineering in Life Sciences}, volume = {13}, journal = {Engineering in Life Sciences}, number = {3}, publisher = {Wiley}, address = {Weinheim}, doi = {10.1002/elsc.201200188}, pages = {239 -- 246}, year = {2013}, abstract = {Commercial materials with polyvinylpolypyrrolidone and polymeric amberlites (XAD7HP, XAD16) are commonly used for the adsorptive downstream processing of polyphenols from renewable resources. In this study, beta-zeolite-based adsorbent systems were examined, and their properties were compared to organic resins. Batch adsorption experiments were conducted with synthetic solutions of major polyphenols. Adsorption isotherms and desorption characteristics of individual adsorbent were determined based on these results. Maximum adsorption capacities were calculated using the Langmuir model. For example, the zeolites had capacities up to 203.2 mg/g for ferulic acid. To extend these results to a complex system, additional experiments were performed on rapeseed meal and wheat seed extracts as representative renewable resources. HPLC analysis showed that with 7.5\% w/v, which is regarded as the optimum amount of zeolites, zeolites A and B could bind 100\% of the major polyphenols as well as release polyphenols at high yields. Additionally, regeneration experiments were performed with isopropyl alcohol at 99°C to evaluate how zeolites regenerate under mild conditions. The results showed only a negligible loss of adsorption capacity and no loss of desorption capacity. In summary, it was concluded that beta-zeolites were promising adsorbents for developing new processes to isolate polyphenols from renewable resources.}, language = {en} } @article{AlKaidyDuweHusteretal.2014, author = {Al-Kaidy, Huschyar and Duwe, Anna and Huster, Manuel and Muffler, Kai and Schlegel, Christin and Sieker, Tim and Stadtm{\"u}ller, Ralf and Tippk{\"o}tter, Nils and Ulber, Roland}, title = {Biotechnologie und Bioverfahrenstechnik - Vom ersten Ullmanns Artikel bis hin zu aktuellen Forschungsthemen}, series = {Chemie Ingenieur Technik}, volume = {86}, journal = {Chemie Ingenieur Technik}, number = {12}, publisher = {Wiley-VCH}, address = {Weinheim}, issn = {0009-286X}, doi = {10.1002/cite.201400083}, pages = {2215 -- 2225}, year = {2014}, abstract = {Biotechnologie und die mit ihr verbundenen technischen Prozesse pr{\"a}gen seit Jahrtausenden die Entwicklung der Menschheit. Ausgehend von empirischen Verfahren, insbesondere zur Herstellung von Lebensmitteln und t{\"a}glichen Gebrauchsg{\"u}tern, haben sich diese Disziplinen zu einem der innovativsten Zukunftsfelder entwickelt. Durch das immer detailliertere Verst{\"a}ndnis zellul{\"a}rer Vorg{\"a}nge k{\"o}nnen mittlerweile Produktionsst{\"a}mme gezielt optimiert werden. Im Zusammenspiel mit moderner Prozesstechnik k{\"o}nnen so eine Vielzahl von Bulk- und Feinchemikalien sowie Pharmazeutika effizient hergestellt werden. In diesem Artikel werden exemplarisch einige der aktuellen Trends vorgestellt.}, language = {de} } @article{WiesenTippkoetterMuffleretal.2014, author = {Wiesen, Sebastian and Tippk{\"o}tter, Nils and Muffler, Kai and Suck, Kirstin and Sohling, Ulrich and Ruf, Nils and Ulber, Roland}, title = {Adsorptive Vorbehandlung von Rohglycerin f{\"u}r die 1,3-Propandiol Fermentation mit Clostridium diolis}, series = {Chemie Ingenieur Technik}, volume = {86}, journal = {Chemie Ingenieur Technik}, number = {1-2}, publisher = {Wiley-VCH}, address = {Weinheim}, doi = {10.1002/cite.201300080}, pages = {129 -- 135}, year = {2014}, abstract = {Bei der Gewinnung von Fetts{\"a}uren aus Pflanzen{\"o}len, z. B. zur Herstellung von Biopolymeren, oder bei der Biodiesel- und Seifenproduktion, f{\"a}llt Glycerin als Nebenprodukt an. Bei der Biokonversion dieses Rohstoffes zu 1,3-Propandiol wird der Produktionsorganismus Clostridium diolis durch Verunreinigungen im Rohglycerin gehemmt. Als inhibierende Substanzen konnten freie Fetts{\"a}uren identifiziert werden. Mithilfe eines adsorptiven Aufarbeitungsverfahrens ist es gelungen, die Fetts{\"a}uren zu entfernen und die Konversionseffizienz zu 1,3-Propandiol zu erh{\"o}hen.}, language = {de} } @article{TippkoetterWollnySucketal.2014, author = {Tippk{\"o}tter, Nils and Wollny, Steffen and Suck, Kirstin and Sohling, Ulrich and Ruf, Friedrich and Ulber, Roland}, title = {Recycling of spent oil bleaching earth as source of glycerol for the anaerobic production of acetone, butanol, and ethanol with Clostridium diolis and lipolytic Clostridium lundense}, series = {Engineering in Life Sciences}, volume = {14}, journal = {Engineering in Life Sciences}, number = {4}, publisher = {Wiley-VCH}, address = {Weinheim}, issn = {1618-2863}, doi = {10.1002/elsc.201300113}, pages = {425 -- 432}, year = {2014}, abstract = {A major part of edible oil is subjected to bleaching procedures, primarily with minerals applied as adsorbers. Their recycling is currently done either by regaining the oil via organic solvent extraction or by using the spent bleaching earth (SBE) as additive for animal feed, etc. As a new method, the reutilization of the by-product SBE for the microbiologic formation of acetone, butanol, and ethanol (ABE) is presented as proof-of-concept. The SBE was taken from a palm oil cleaning process. The recycling concept is based on the application of lipolytic clostridia strains. Due to considerably long fermentation times, co-fermentation with Candida rugosa and enzymatic hydrolyses of the bound oil with a subsequent clostridia fermentation are shown as alternative routes. Anaerobic fermentations under comparison of different clostridia strains were performed with glycerol media, enzymatically hydrolyzed palm oil and SBE. Solutes, side product compositions and productivities were quantified via HPLC. A successful production of ABE solutes from SBE has been done with a yield of 0.15 g butanol per gram of bound glycerol. Thus, the biotechnological recycling of the waste stream is possible in principle. Inhibition of the substrate suspension has been observed. A chromatographic ion-exchange of substrates increased the biomass concentration.}, language = {en} } @article{PasteurTippkoetterKampeisetal.2014, author = {Pasteur, Aline and Tippk{\"o}tter, Nils and Kampeis, Percy and Ulber, Roland}, title = {Optimization of high gradient magnetic separation filter units for the purification of fermentation products}, series = {IEEE TRANSACTIONS ON MAGNETICS}, volume = {50}, journal = {IEEE TRANSACTIONS ON MAGNETICS}, number = {10}, publisher = {IEEE}, address = {New York, NY}, issn = {0018-9464}, doi = {10.1109/TMAG.2014.2325535}, pages = {Artikel 5000607}, year = {2014}, abstract = {High gradient magnetic separation (HGMS) has been established since the early 1970s. A more recent application of these systems is the use in bioprocesses. To integrate the HGMS in a fermentation process, it is necessary to optimize the separation matrix with regard to the magnetic separation characteristics and permeability of the non-magnetizable components of the fermentation broth. As part of the work presented here, a combined fluidic and magnetic force finite element model simulation was created using the software COMSOL Multiphysics and compared with separation experiments. Finally, as optimal lattice orientation of the separation matrix, a transversal rhombohedral arrangement was defined. The high suitability of the new filter matrix has been verified by separation experiments.}, language = {en} } @article{ThielMufflerTippkoetteretal.2015, author = {Thiel, Alexander and Muffler, Kai and Tippk{\"o}tter, Nils and Suck, Kirstin and Sohling, Ulrich and Ruf, Friedrich and Ulber, Roland}, title = {Aufarbeitung von Polyphenolen aus Weizen mittels Zeolithen am Beispiel der Ferulas{\"a}ure}, series = {Chemie IngenieurTechnik}, volume = {87}, journal = {Chemie IngenieurTechnik}, number = {1-2}, publisher = {Wiley}, address = {Weinheim}, doi = {10.1002/cite.201400031}, pages = {128 -- 136}, year = {2015}, abstract = {Aufarbeitung von Polyphenolen aus Weizenmittels Zeolithen am Beispiel der Ferulasa¨ ureAlexander Thiel1, Kai Muffler1, Nils Tippko¨ tter1, Kirstin Suck2, Ulrich Sohling2, Friedrich Ruf3und Roland Ulber1,*DOI: 10.1002/cite.201400031Bei der Ferulasa¨ure handelt es sich um einen Wertstoff, der aus Weizen gewonnen und in der Lebensmittel- und Pharma-industrie eingesetzt werden kann. Der Einsatz von Weizen als nachwachsende Rohstoffquelle ist allerdings nur dann wirt-schaftlich durchfu¨hrbar, wenn eine Prozessintegration in die bestehenden industriellen Verfahren gewa¨hrleistet oder einedirekte Konkurrenz zur Mehl- und Sta¨rkeindustrie vermieden werden kann. In diesem Artikel wird ein Verfahren aufge-zeigt, welches hohe Ausbeuten ermo¨glicht und eine Konkurrenz zu bestehenden Verwertungspfaden vermeidet.}, language = {de} }