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Methods for producing ethanol from carbon substrates

  • US 20050100996A1
  • Filed: 05/27/2004
  • Published: 05/12/2005
  • Est. Priority Date: 02/08/2002
  • Status: Abandoned Application
First Claim
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1. A method for producing an alcohol as an end-product comprising the steps of:

  • a) contacting a biomass carbon substrate which includes raw starch and at least two substrate-converting glucoamylase enzymes to produce an intermediate comprising pentoses. hexoses or combinations thereof;

    wherein one substrate-converting glucoamylase is a raw starch hydrolyzing (RSH) glucoamylase; and

    b) contacting said intermediate with at least one intermediate-converting enzyme produced by an ethanologenic microorganism, wherein said intermediate is substantially all converted by said intermediate-converting enzyme to said alcohol end-product and the presence of the alcohol end-product does not inhibit the further production of said alcohol end-product.

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