Methods for improving the efficiency of simultaneous saccharification and fermentation reactions
First Claim
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1. A method for simultaneous saccharification and fermentation (SSF) comprising culturing a complete fermentation medium, said complete fermentation medium comprising at least one fermenting microorganism, at least one xylan-containing biomass, at least one cellulase, at least one hemicellulase, at least one retaining β
- -xylosidase, and at least one inverting β
-xylosidase, for a period and under conditions suitable for producing a fermentation product, which is an alcohol, wherein the at least one inverting β
-xylosidase comprises an Fv43D polypeptide having at least 90% sequence identity to SEQ ID NO;
2, or to residues 21 to 350 of SEQ ID NO;
2, and the complete fermentation medium comprises a greater amount of the at least one inverting β
-xylosidase than that of the at least one retaining β
-xylosidase on a mole basis.
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Abstract
The present disclosure is directed, in a first aspect, to the use of inverting beta-xylosidase enzymes to reduce byproduct formation and increase the yield of fermentation products, as well as, in a second aspect, to the use of retaining beta-xylosidase enzymes to improve production of alkyl-beta-xylopyranoside compounds, in a simultaneous saccharification and fermentation reactions.
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39 Claims
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1. A method for simultaneous saccharification and fermentation (SSF) comprising culturing a complete fermentation medium, said complete fermentation medium comprising at least one fermenting microorganism, at least one xylan-containing biomass, at least one cellulase, at least one hemicellulase, at least one retaining β
- -xylosidase, and at least one inverting β
-xylosidase, for a period and under conditions suitable for producing a fermentation product, which is an alcohol, wherein the at least one inverting β
-xylosidase comprises an Fv43D polypeptide having at least 90% sequence identity to SEQ ID NO;
2, or to residues 21 to 350 of SEQ ID NO;
2, and the complete fermentation medium comprises a greater amount of the at least one inverting β
-xylosidase than that of the at least one retaining β
-xylosidase on a mole basis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
- -xylosidase, and at least one inverting β
Specification