Wheat bran biorefinery – An insight into the process chain for the production of lactic acid. (March 2015)

• Record Type: Journal Article
• Authors: Tirpanalan, Özge; Reisinger, Michael; Smerilli, Marina; Huber, Florian; Neureiter, Markus; Kneifel, Wolfgang; Novalin, Senad
• Is Part Of: Bioresource technology. Volume 180(2015)
• Page Start: 242
• Page End: 249
• Publication Date: 2015-03
• Subjects: Wheat bran -- Biorefinery -- Lactic acid -- Lignocellulose -- Fermentation; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2015.01.021
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: A wheat bran biorefinery concept including the major processing steps was studied. A pre-extract containing 32% of the total dry mass was obtained. Fermentation of lignocellulosic fraction yielded 0.73 g lactic acid/g substrate. An overall product efficiency of 47% was achieved experimentally. A maximum product yield of 80% could be estimated theoretically. Abstract: 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 21 g/L. The fermentation resulted in a lactic acid yield of 0.73 g/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.