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  • Title: Production of beta-carotene-enriched rice bran using solid-state fermentation of Rhodotorula glutinis.
    Author: Roadjanakamolson M, Suntornsuk W.
    Journal: J Microbiol Biotechnol; 2010 Mar; 20(3):525-31. PubMed ID: 20372023.
    Abstract:
    This work was aimed at utilizing rice bran as a substrate for beta-carotene production by Rhodotorula glutinis DM 28 under optimized conditions of solid-state fermentation. The biomass and beta-carotene content of Rhodotorula glutinis DM 28 grown on rice bran as a sole substrate under solid-state fermentation were 54 g/kg rice bran and 1.65 mg/kg rice bran, respectively. Its biomass and beta-carotene content, however, could be improved by 60% and 30%, respectively, using the Central Composite Design for the optimization of its cultivation conditions. The optimized conditions obtained were a pH of 5, a moisture content of 70% (w/w), and a carbon-to-nitrogen ratio of 4. Under these conditions, rice bran containing R. glutinis DM 28 had nutritional values of beta-carotene, protein, and fat higher than those of rice bran alone. Yeast-grown rice bran could be suitable, therefore, to use as a beta-carotene-enriched supplement in animal feeds.
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