METHOD FOR CELLULASE PRODUCTION
First Claim
1. A fermentation process for the production of a cellulase mixture comprising providing a cellulase-secreting host cell of the genus Trichoderma or Hypocrea with a carbon source for cellulase enzyme production, the carbon source comprising a hemicellulose-derived carbohydrate from about 40 weight percent to about 97 weight percent of the total carbon present in the carbon source, and a cellulase-inducing carbohydrate from about 3 weight percent to about 20 weight percent of the total carbon present in the carbon source, for from about 3 to about 30 days, at a temperature of about 20°
- C. to about 35°
C., at a pH of from about 3.0 to about 6.5, and obtaining the cellulose mixture.
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Abstract
A fermentation process using hemicellulose-derived carbohydrates for the production of cellulase mixtures with a high proportion of cellulases relative to hemicellulases is provided. The cellulases produced by the process of the invention are further characterized by high specific productivity. The resulting cellulase mixtures comprise at least two times more cellulase than hemicellulase and are useful for the hydrolysis of cellulosic substrated, particularly, pretreated lignocellulosic substrate.
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Citations
18 Claims
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1. A fermentation process for the production of a cellulase mixture comprising providing a cellulase-secreting host cell of the genus Trichoderma or Hypocrea with a carbon source for cellulase enzyme production, the carbon source comprising a hemicellulose-derived carbohydrate from about 40 weight percent to about 97 weight percent of the total carbon present in the carbon source, and a cellulase-inducing carbohydrate from about 3 weight percent to about 20 weight percent of the total carbon present in the carbon source, for from about 3 to about 30 days, at a temperature of about 20°
- C. to about 35°
C., at a pH of from about 3.0 to about 6.5, and obtaining the cellulose mixture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
- C. to about 35°
Specification