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- W2094598071 abstract "The effect of nitrogen sources including yeast extract, peptone, soybean hydrolyzate and some inorganic nitrogen sources, as well as the nitrogen concentration on the fermentative production of pyruvate by Torulopsis glabrata WSH-IP12 was investigated. The addition of yeast extract greatly inhibited pyruvate accumulation, while peptone was shown to be the most favorable nitrogen source. In flask culture, 15 g l−1 peptone was needed to consume 80 g l−1 glucose with 23.4 g l−1of pyruvate accumulated. Pyruvate production was markedly dependent on the ratio of carbon to nitrogen (C:N), its production was improved by increasing the concentration of glucose and peptone proportionally and reduced by exclusively increasing the glucose concentration. In a glucose fed-batch culture, cell growth and pyruvate production slowed after 28 h. However, cell growth and pyruvate production recovered after further nitrogen, in the form of peptone and ammonium sulfate, was added to the culture. A final concentration of pyruvate of 54.5 g l−1 was achieved at 64 h (yield to glucose consumed of 0.471 g g−l). By using aqueous ammonia instead of potassium hydroxide for pH control, 57.3 g l−1 pyruvate with a yield of 0.498 g g−1 was produced by 55 h. This result further indicates that nitrogen level plays an important role in the production of pyruvate." @default.
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- W2094598071 date "2000-07-01" @default.
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- W2094598071 title "Effect of nitrogen source and nitrogen concentration on the production of pyruvate by Torulopsis glabrata" @default.
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- W2094598071 doi "https://doi.org/10.1016/s0168-1656(00)00273-x" @default.
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