Influence of the nitrogen source on growth and ethanol production by Pichia stipitis NRRL Y-7124
1992
Guebel, D.V. | Cordenons, A. | Cascone, O. | Giulietti, A.M. | Nudel, C.
Growth and ethanol production by Pichia stipitis in media containing different nitrogen sources were compared. Ammonium sulphate (plus vitamins and trace elements) increased ethanol productivity 57% and ethanol-biomass yield 113%, compared to yeast extract. Consumption of ammonium, amino-acids and total nitrogen was determined. Two ammonium effects, low uptake in complex media and fermentation stimulation in defined media are discussed in terms of ammonium-ammonia futile cycling and maintenance energy.
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