Composite Yeast for High Concentration Alcohol Fermentation
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Solution Overview
Problem
Alcohol fermentation from sugar-containing raw materials faces challenges with incomplete fermentation due to inadequate nutrition and high residual sugar content, especially at high alcohol concentrations, as existing methods fail to provide necessary nutrients and lead to increased equipment costs.
Innovation Solution
A composite yeast comprising dried yeast and essential nutrients such as nitrogen, phosphorous, inorganic salts, trace vitamins, and bacteriostatic agents is developed to enhance fermentation efficiency and complete sugar conversion without additional pretreatment, using existing equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If common leaven is used for alcohol fermentation from sugar-containing raw materials, then the fermentation process is simple, but the alcoholicity is limited to 11-13% v/v and residual sugar content increases
Solution Approach 1:
The patent uses composite yeast comprising multiple strains (Saccharomyces cerevisiae, Candida millii, and Pichia stipitis) combined with nutrient supplements (yeast extract, peptone, inorganic salts, vitamins) to create a multi-functional fermentation system that achieves high alcoholicity (14.5-15.5% v/v) and complete sugar conversion without complicating the process
2Productivity
If high alcohol concentration fermentation is pursued using common leaven, then alcohol production increases, but residual sugar content becomes higher and raw material utilization deteriorates
Solution Approach 1:
The patent changes the physiological state parameters of the fermentation system by providing specific nutrients (nitrogen source, phosphorous source, vitamins) that enable yeast to maintain high fermentation activity at elevated alcohol concentrations, allowing complete sugar conversion even when alcoholicity reaches 14.5-15.5% v/v
3Loss of substance
If additional pretreatment and equipment are added to improve fermentation completeness, then residual sugar content decreases, but equipment cost increases sharply
Solution Approach 1:
The patent makes the fermentation system self-sufficient by formulating composite yeast with embedded nutrients that enable complete sugar conversion under high alcohol conditions without requiring external pretreatment processes or additional equipment, achieving both fermentation completeness and process simplicity
4Productivity
If nutrient supplementation is provided to improve yeast performance, then fermentation efficiency increases, but production cost increases
Solution Approach 1:
The patent applies partial supplementation with specific nutrients (yeast extract 0.5-1.0%, peptone 0.5-1.0%, and minimal inorganic salts and vitamins) that provide just enough nutrition to enable high alcoholicity and complete fermentation, avoiding excessive cost while achieving the desired fermentation efficiency
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composite yeast improves fermentation efficiency, reduces residual sugar content, decreases production costs, and simplifies the process, achieving higher alcohol concentrations (14.5-15.5% v/v) with minimal residual sugar (0-0.1wt%) in sugar-containing raw materials.
Implementation Method 1
alcohol fermentation from sugar-containing raw materials
Implementation Method 2
a bacteriostatic, providing the necessary nutrition for yeast growth and fermentation, and also inhibiting the other bacteria proliferation
Data Source
AI summary
The present invention relates to a composite yeast suitable for high concentration alcohol fermentation from sugar-containing raw materials, characterizing in that the composite yeast comprises any kind of dried yeast selected from Brewers yeast Saccharomyces cerevisiae Hansen of Saccharomyces cerevisiae, grape wine yeast Saccharomyces uvarum Beijerinek, and nutritious materials which are necessary for yeast growth, the nutritious materials include: the dried yeast 40-70 parts by weight, a nitrogen source 20-40 parts by weight, a phosphorous source 5-10 parts by weight, an other inorganic salt 2.5-5 parts by weight, a trace vitamin 1-2.5 parts by weight and a bacteriostatic 0.5-1.2 parts by weight. The present invention further relates to a method for preparation of the composite yeast suitable for high concentration alcohol fermentation from sugar-containing raw materials. Using the composite yeast of the present invention to proceed with sugar fermentation can increase fermentation alcoholicity, decrease residual sugar content, and allows the final alcoholicity of standard raw material, such as sucrose to attain to 14.5-15.5% v/v, and the amount of the residual reducing sugar in the fermentation mash is 0-0.1 wt %.