Bioresource Technology, Vol.227, 35-43, 2017
Production of a generic microbial feedstock for lignocellulose biorefineries through sequential bioprocessing
Lignocellulosic materials, mostly from agricultural and forestry residues, provide a potential renewable resource for sustainable biorefineries. Reducing sugars can be produced only after a pre-treatment stage, which normally involves chemicals but can be biological. In this case, two steps are usually necessary: solid-state cultivation of fungi for deconstruction, followed by enzymatic hydrolysis using cellulolytic enzymes. In this research, the utilisation of solid-state bioprocessing using the fungus Trichoderma longibrachiatum was implemented as a simultaneous microbial pretreatment and in-situ enzyme production method for fungal autolysis and further enzyme hydrolysis of fermented solids. Suspending the fermented solids in water at 50 degrees C led to the highest hydrolysis yields of 226 mg/g reducing sugar and 7.7 mg/g free amino nitrogen (FAN). The resultant feedstock was shown to be suitable for the production of various products including ethanol. (C) 2017 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license.
Keywords:Trichoderma longibrachiatum;Solid-state bioprocessing;Sugarcane bagasse;Soybean hull;In-situ enzyme hydrolysis;Generic microbial feedstock