Fermentation ofd-xylose,d-glucose andl-arabinose mixture byPichia stipitis Y 7124: sugar tolerance |
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Authors: | J P Delgenes R Moletta J M Navarro |
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Institution: | (1) Station d'Oenologie et de Technologie des Produits Végétaux, Institut National de la Recherche Agronomique, Boulevard du Général de Gaulle, F-11104 Narbonne Cedex, France;(2) Centre de Génie et Technologie Alimentaires - Microbiologie Industrielle, Université des Sciences et Techniques du Languedoc, Place E. Bataillon, F-34060 Montpellier Cedex, France |
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Abstract: | Summary The effect of substrate concentration (S
0) on the fermentation parameters of a sugar mixture byPichia stipitis Y 7124 was investigated under anaerobic and microaerobic conditions. Under microaerobiosisP. stipitis maintained high ethanol yield and productivity when initial substrate concentration did not exceed 150 g/l; ethanol yield of about 0.40 g/g and volumetric productivity up to 0.39 g/l per hour were obtained. Optimal specific ethanol productivity (0.2 g/g per hour) was observed withS
0=110 g/l. Under anaerobic conditionsP. stipitis exhibited the highest fermentative performances atS
0=20 g/l; it produced ethanol with a yield of 0.42 g/g, with a specific rate of 1.1 g/g per day. When the initial substrate level increased, specific ethanol productivity declined gradually and ethanol yield was dependent on the degree of utilization of each sugar in the mixture.Abbreviations
E
m
maximum produced ethanol (g/l)
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E
0
initial ethanol (g/l)
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E
v
evaporated ethanol (g/l)
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Q
p
volumetric productivity of ethanol (g ethanol/l per hour or g/l per day)
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q
p
specific productivity of ethanol (g ethanol/g cells per hour)
-
q
pm
maximum specific productivity of ethanol (g/l per hour)
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S
0
initial substrate concentration (g/l)
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t
f
time at which produced ethanol is maximum (h)
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Y
p/s
ethanol yield (g ethanol produced/g substrate utilized)
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Y
x/s
cell yeild (g cells produced/g substrate utilized)
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Y
xo/xy
xylitol yield (g xylitol produced/g xylose utilized)
-
probability coefficient
-
specific growth rate coefficient (h-1 or d-1) |
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Keywords: | |
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