Journal
BIORESOURCE TECHNOLOGY
Volume 98, Issue 5, Pages 1138-1143Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2006.04.021
Keywords
potato chips; protein enrichment; solid-state fermentation; yeast; starch waste waters
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Potato starch obtained from waste waters of chips manufacturing was used as a fermentation substrate for yeast protein enrichment. Among 18 yeast strains, 6 strains were screened according to their biomass yield and protein content after fermentation for 16 h at 30 degrees C in an aerated glucose-based liquid media (4.5 Ls). Using concentrated media (25% solids) made from potato starch pre-hydrolyzed with malt flour and batch-fermented for 20 h at 26 degrees C under aerobic conditions, Candida utilis ATCC 9256 was the most efficient proteinforming strain. Scaled-up at the 100 Ls level, the aerobic batch process was improved under fed-batch conditions with molasses supplementation. After drying, fermented starch contained 11-12% protein, including 7-8% yeast protein. Crown Copyright (c) 2006 Published by Elsevier Ltd. All rights reserved.
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