Composite yeast suitable for high concentration alcohol fermentation

• US 8,697,425 B2
• Filed: 12/30/2005
• Issued: 04/15/2014
• Est. Priority Date: 07/20/2005
• Status: Active Grant

• Current Assignee: Angel Yeast Company Limited
• Original Assignee: Angel Yeast Company Limited
• Inventors: Yu, Xuefeng, Li, Zhihong, Yu, Minghua, Yao, Juan, Li, Zhijun, Liu, Daiwu
• Primary Examiner(s): Marx, Irene
• Application Number:
  US11/914,475
• Publication Number:
  US 20080187987A1
• Time in Patent Office: 3,028 Days
• Field of Search: None
• US Class Current: 435/255.2
• CPC Class Codes: C12C 12/006 Yeasts processes for seeding C12C11/02
• CPC Class Codes: C12G 1/0203 by microbiological or enzymatic treatment
• CPC Class Codes: C12J 1/00 Vinegar; Preparation or purification thereof
• CPC Class Codes: C12N 1/18 Baker's yeast; Brewer's yeast
• CPC Class Codes: C12N 9/16 acting on ester bonds (3.1)
• CPC Class Codes: C12N 9/2402 hydrolysing O- and S- glycosyl compounds (3.2.1)
• CPC Class Codes: C12N 9/2437 Cellulases (3.2.1.4; 3.2.1.74; 3.2.1.91; 3.2.1.150)
• CPC Class Codes: C12N 9/244 Endo-1,3(4)-beta-glucanase (3.2.1.6)
• CPC Class Codes: C12N 9/60 from yeast
• CPC Class Codes: C12P 7/06 Ethanol, i.e. non-beverage
• CPC Class Codes: C12Y 302/01004 Cellulase (3.2.1.4), i.e. endo-1,4-beta-glucanase
• CPC Class Codes: C12Y 302/01006 Endo-1,3(4)-beta-glucanase (3.2.1.6)
• CPC Class Codes: C12Y 302/01015 Polygalacturonase (3.2.1.15)
• CPC Class Codes: Y02E 50/10 Biofuels, e.g. bio-diesel

Abstract

The present invention relates to a composite yeast for high concentration alcohol fermentation, which includes thermostable Saccharomyces cerevisiae, acid protease, phytase, cellulose, β-glucanase, and pectinase, and is suitable for the high concentration alcohol fermentation for various raw materials. In addition to normal fermentation, the composite yeast of the present invention can degrade the raw materials, increase the nutrient ingredients in the mash, promote the growth of yeast and provide stress tolerance protection.

Claims

1. A yeast composition suitable for high concentration alcohol fermentation, consisting of thermostable Saccharomyces cerevisiae, acid protease, phytase, cellulase, β

-glucanase, and pectinase in weight ratios of;

thermostable Saccharomyces cerevisiae 61-83 wt %

acid protease 5-30 wt %

phytase 3-10 wt %

cellulase 2-10 wt %

β

-glucanase 1-2 wt %

pectinase 1-2 wt %.

2. A yeast composition according to claim 1, wherein the weight ratios are:

thermostable Saccharomyces cerevisiae 61-78 wt %

acid protease 10-20 wt %

phytase 3-8 wt %

cellulase 5-8 wt %

β

-glucanase 1-1.8 wt %

pectinase 1-1.5 wt %.

3. A yeast composition according to claim 2, wherein the weight ratios are:

thermostable Saccharomyces cerevisiae 75 wt %

acid protease 12 wt %

phytase 5 wt %

cellulase 5 wt %

β

-glucanase 1.5 wt %

pectinase 1.5 wt %.