BioChem - DOS

Wheat bran biorefinery - An insight into the process chain for the production of lactic acid

Bioresource technology : biomass, bioenergy, biowastes, conversion technologies, biotransformations, production technologies

Tirpanalan, O.; Reisinger, M.; Smerilli, M.; Huber, F.; Neureiter, M.; Kneifel, W.; Novalin, S.

The present study investigates a wheat bran biorefinery including major processing steps pre-extraction, pre-treatment and lactic acid fermentation. Concerning the dry mass distribution, during the pre-extraction 32% of the feedstock was recovered, offering some perspectives for applications in food area. The pre-treatment (hydrothermal/enzymatic hydrolysis) of the remaining cake solubilized 34% of dry mass and led to a fermentable sugar concentration of 21g/L. The fermentation resulted in a lactic acid yield of 0.73g/g substrate. Concentrating the fermentation feed via nanofiltration did not improve the lactic acid productivity. Taking into account that Lactobacillus pentosus, a heterofermentative microorganism was used, the dry mass balance revealed a product yield of 47% (32% extract, 15% lactic acid). Based on a theoretical consideration involving a cellulolytic enzyme production (10% feedstock allocation) and lignin utilization, under optimized conditions a maximum product yield of around 80% (35% extract, 39% lactic acid, 6% lignin) could be expected.

2015

Elsevier Applied Science

0960-8524

180

pp.242-249

10.1016/j.biortech.2015.01.021

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART71414817

Wheat bran; Biorefinery; Lactic acid; Lignocellulose; Fermentation