期刊
FOOD RESEARCH INTERNATIONAL
卷 73, 期 -, 页码 31-37出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.foodres.2014.12.023
关键词
Lactic acid: fermentation; Brewer's spent grain
资金
- Ministry of Education, Science and Technological Development of Republic of Serbia [TR-31017]
Brewer's spent grain (BSG) is the major by-product of the brewing industry, representing around 85% of the total. by-products generated. In this study BSG hydrolysate was produced using optimal conditions. Hydrolysates were used for lactic acid (LA) fermentation by Lactobacillus fermentum (PL-1) and Lactobacillus rhamnosus (ATCC 7469). The aim of this study was to evaluate possibilities of the BSG hydrolysate utilization as a substrate for LA fermentation. The effect of calcium-carbonate (2%) and yeast extract (0.5 to 5%) addition in hydrolysate on LA fermentation were investigated. The LA production by L. fermentum and L. rhamnosus in BSG hydrolysate was influenced by calcium-carbonate and yeast extract supplementation. L. fermentum produced a racemic mixture of L-(+)- and D-(-)-LA while L. rhamnosus produced mostly L-(+)-LA (95-98%) in all fermentations. Calcium-carbonate addition increased total LA yield by 13% in L. fermentum fermentations and by 17% in L rhamnosus fermentations. Yeast extract addition increased total LA yield by 4-26% in L. fennentum fermentations and by 6-8% in L. rhamnosus fermentations. (C) 2014 Elsevier Ltd. All rights reserved.
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