期刊
ENZYME AND MICROBIAL TECHNOLOGY
卷 55, 期 -, 页码 50-57出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.enzmictec.2013.12.007
关键词
Secondary metabolite; Monascus pigments; Citrinin; Nitrogen source; pH
资金
- National Natural Science Foundation of China [21276155]
Microbial fermentation of citrinin-free Monascus pigments is of great interest to meet the demand of food safety. In the present work, the effect of various nitrogen sources, such as monosodium glutamate (MSG), cornmeal, (NH4)(2)SO4, and NaNO3, on Monascus fermentation was examined under different initial pH conditions. The composition of Monascus pigments and the final pH of fermentation broth after Monascus fermentation were determined. It was found that nitrogen source was directly related to the final pH and the final pH regulated the composition of Monascus pigments and the biosynthesis of citrinin. Thus, an ideal nitrogen source can be selected to control the final pH and then the citrinin biosynthesis. Citrinin-free orange pigments were produced at extremely low initial pH in the medium with (NH4)(2)SO4 or MSG as nitrogen source. No citrinin biosynthesis at extremely low pH was further confirmed by extractive fermentation of intracellular pigments in the nonionic surfactant Triton X-100 micelle aqueous solution. This is the first report about the production of citrinin-free Monascus pigments at extremely low pH. (C) 2013 Elsevier Inc. All rights reserved.
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