期刊
JOURNAL OF INDUSTRIAL MICROBIOLOGY & BIOTECHNOLOGY
卷 37, 期 11, 页码 1183-1192出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s10295-010-0765-y
关键词
Astaxanthin; beta-Carotene; Red yeasts; Value addition
资金
- Department of Grain Science and Industry, Kansas State University
- Kansas Agricultural Experiment Station, Manhattan, USA [10-083-J]
Whole stillage-a co-product of grain-based ethanol-is used as an animal feed in the form of dried distiller's grain with solubles (DDGS). Since animals cannot synthesize carotenoids and animal feed is generally poor in carotenoids, about 30-120 ppm of total carotenoids are added to animal feed to improve animal health, enhance meat color and quality, and increase vitamin A levels in milk and meat. The main objective of this study was to produce carotenoid (astaxanthin and beta-carotene)-enriched DDGS by submerged fermentation of whole stillage. Mono- and mixed cultures of red yeasts, Phaffia rhodozyma (ATCC 24202) and Sporobolomyces roseus (ATCC 28988), were used to produce astaxanthin and beta-carotene. Media optimization was carried out in shake flasks using response surface methodology (RSM). Macro ingredients, namely whole stillage, corn steep liquor and glycerol, were fitted to a second-degree polynomial in RSM. Under optimized conditions, astaxanthin and beta-carotene yields in mixed culture and P. rhodozyma monoculture were 5 and 278, 97, and 275 mu g/g, respectively, while S. roseus produced 278 mu g/g of beta-carotene. Since the carotenoid yields are almost twice the quantity used in animal feed, the carotenoid-enriched DDGS has potential application as value-added animal feed or feed blends..
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