期刊
BIOCHEMICAL ENGINEERING JOURNAL
卷 65, 期 -, 页码 10-15出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.bej.2012.03.010
关键词
Aspergillus awamori; Aspergillus oryzae; Actinobacillus succinogenes; Biorefinery; Food waste
资金
- Department of Chemical and Biomolecular Engineering at the HKUST
- Division of Life Science at the HKUST
- Department of Physics at the HKUST
- City University of Hong Kong [72000248]
A novel biorefinery concept of utilising waste bread as a sole nutrient source for the production of a nutrient rich feedstock for the fermentative succinic acid production by Actinobacillus succinogenes has been developed. Waste bread was used in the solid-state fermentations of Aspergillus awamori and Aspergillus oryzae that produce enzyme complexes rich in amylolytic and proteolytic enzymes, respectively. The resulting fermentation solids were added directly to a bread suspension to generate a hydrolysate containing over 100g/L glucose and 490 mg/L free amino nitrogen (FAN). A first-order kinetic model was used to describe the effect of initial bread mass ratio on glucose and FAN profiles. The bread hydrolysate was used as the sole feedstock for A. succinogenes fermentations, which led to the production of 47.3 g/L succinic acid with a yield and productivity of 1.16 g SA/g glucose and 1.12 g/L h. This corresponds to an overall yield of 0.55 g succinic acid per g bread. This is the highest succinic acid yield compared from other food waste-derived media reported to date. The proposed process could be potentially utilised to transform no-value food waste into succinic acid, one of the future platform chemicals of a sustainable chemical industry. Crown Copyright (c) 2012 Published by Elsevier B.V. All rights reserved.
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