Alcoholic fermentation process in the presence of a high alcohol tolerant yeast and a maltotriose positive yeast

Abstract

The invention relates to an alcoholic fermentation process in the presence of one or more high alcohol tolerant yeast and one or more maltotriose positive yeast. The process of the present invention can be a fermentation process for the production of ethanol, for the production of beer, for the production of wine and the like. In a preferred embodiment, the present invention relates to a process for the production of ethanol in the presence of distiller's yeast and baker's yeast.

1 .- 13 . (canceled) 
     
     
         14 . A composition for use in a process for the production of ethanol characterized in that said composition comprises one or more high alcohol tolerant yeasts and one or more maltotriose positive yeasts. 
     
     
         15 . A composition comprising one or more high alcohol tolerant yeast and/or extracts there from, and one or more maltotriose positive yeast and/or extracts there from, characterized in that said composition is a by-product of a fermentation process comprising fermenting a carbohydrate containing substrate in the presence of one or more high alcohol tolerant yeasts having an alcohol tolerance of at least 100 g/l and one or more maltotriose positive yeasts, wherein the substrate comprises maltose and maltotriose. 
     
     
         16 . The composition of  claim 15 , wherein the by-product comprises whole stillage or a composition derived therefrom. 
     
     
         17 . The composition of  claim 15 , wherein the by-product comprises distillers wet grains, thin stillage, condensed thin stillage, distillers dried grain, distillers dried grains and solubles, or a mixture thereof. 
     
     
         18 . The composition of  claim 15 , wherein the one or more high alcohol tolerant yeast is maltotriose negative and/or wherein the one or more maltotriose positive yeasts is low alcohol tolerant. 
     
     
         19 . The composition of  claim 15 , wherein the one or more maltotriose positive yeasts has the ability to ferment maltose faster than the high alcohol tolerant yeast. 
     
     
         20 . The composition of  claim 15 , wherein the one or more high alcohol tolerant yeasts is distiller's yeast. 
     
     
         21 . The composition of  claim 15 , wherein the one or more high alcohol tolerant yeasts is brewer's yeast. 
     
     
         22 . The composition of  claim 15 , wherein the one or more maltotriose positive yeasts comprises baker's yeast. 
     
     
         23 . The composition of  claim 15 , wherein the ratio of high alcohol tolerant yeast to maltotriose positive yeast is 75:25 to 25:75. 
     
     
         24 . The composition of  claim 15 , wherein the ratio of high alcohol tolerant yeast to low alcohol tolerant yeast is about 50:50.