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- W1996479105 abstract "An efficient fermentation-strengthening approach was developed to improve the anaerobic production of vitamin B12 by cultivation process optimization with Propionibacterium freudenreichii. The effects of the byproduct propionic acid and the precursor 5,6-dimethylbenzimidazole (DMB) on vitamin B12 biosynthesis were investigated. Byproduct inhibition experiments showed that maintaining propionic acid concentration in broth below 10–20 g/L in the early stage and 20–30 g/L in the late stage can efficiently improve vitamin B12 biosynthesis. Batch fermentation indicated the occurrence of feed-back inhibition in intracellular intermediate biosynthesis. In addition, the incorporation of the precursor DMB depended on the fermentation level of the vitamin B12 intermediate. High vitamin B12 concentration (58.8 mg/L) and production (0.37 mg/g) were obtained with an expanded bed adsorption bioreactor by using the propionic acid and DMB control method. The optimum concentration and production of 59.5 and 0.59 mg/L h for vitamin B12 production were respectively achieved after five continuous batches." @default.
- W1996479105 created "2016-06-24" @default.
- W1996479105 creator A5001733948 @default.
- W1996479105 creator A5025052608 @default.
- W1996479105 date "2008-01-01" @default.
- W1996479105 modified "2023-09-23" @default.
- W1996479105 title "Vitamin B12 and α-ribonucleosides" @default.
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