TY  - JOUR
A1  - Tippkötter, Nils
A1  - Duwe, Anna-Maria
A1  - Wiesen, Sebastian
A1  - Sieker, Tim
A1  - Ulber, Roland
T1  - Enzymatic hydrolysis of beech wood lignocellulose at high solid contents and its utilization as substrate for the production of biobutanol and dicarboxylic acids
JF  - Bioresource Technology
N2  - 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.
Y1  - 2014
U6  - http://dx.doi.org/10.1016/j.biortech.2014.06.052
VL  - 167
SP  - 447
EP  - 455
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Wulfhorst, Helene
A1  - Duwe, Anna-Maria
A1  - Merseburg, Johannes
A1  - Tippkötter, Nils
T1  - Compositional analysis of pretreated (beech) wood using differential scanning calorimetry and multivariate data analysis
JF  - Tetrahedron
N2  - 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.
Y1  - 2016
U6  - http://dx.doi.org/10.1016/j.tet.2016.04.029
VL  - 72
IS  - 46
SP  - 7329
EP  - 7334
PB  - Elsevier
CY  - Amsterdam
ER  -