@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{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}
}
@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}
}
@incollection{UlberMufflerTippkoetteretal.2011,
  author    = {Ulber, Roland and Muffler, Kai and Tippk{\"o}tter, Nils and Hirth, Thomas and Sell, Dieter},
  title     = {Introduction to Renewable Resources in the Chemical Industry},
  series = {Renewable raw materials : new feedstocks for the chemical industry},
  booktitle = {Renewable raw materials : new feedstocks for the chemical industry},
  editor    = {Ulber, Roland and Sell, Dieter and Hirth, Thomas},
  edition   = {1. Auflage},
  publisher = {Wiley-VCH-Verlag},
  address   = {Weinheim},
  isbn      = {978-3-527-32548-1},
  pages     = {1 -- 6},
  year      = {2011},
  language  = {de}
}