Saccharomyces cerevisiae Strain V14/004037 for Ethanol Production
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Solution Overview
Problem
Current ethanol production processes from starch-containing materials face inefficiencies due to limitations in yeast strains, such as Ethanol Red™, which result in reduced ethanol yield, increased by-product formation, and slower fermentation kinetics, necessitating the development of improved Saccharomyces cerevisiae strains with enhanced fermentation capabilities.
Innovation Solution
The use of Saccharomyces cerevisiae MBG4851 or its derivatives, which exhibit increased ethanol yield, reduced lactic acid and glycerol production, lower acetaldehyde levels, faster fermentation kinetics, and higher oil yield, achieved through optimized liquefaction, saccharification, and fermentation processes involving specific alpha-amylases, glucoamylases, and proteases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional yeast strains (e.g., Ethanol Red™) are used for fermentation, then the process is simple and well-established, but ethanol yield is reduced and by-product formation increases
Solution Approach 1:
The patent modifies the genetic parameters of Saccharomyces cerevisiae strains by introducing heterologous genes (such as ADH6, ADH7, and other alcohol dehydrogenase genes) to alter the fermentation metabolism. This genetic parameter change enables the yeast to convert more sugar to ethanol while reducing by-product formation, directly resolving the contradiction between ethanol yield and by-product formation.
Solution Approach 2:
The patent creates composite yeast strains by combining multiple genetic elements within Saccharomyces cerevisiae, including native genes and heterologous genes from other organisms. This composite genetic structure enables the yeast to simultaneously achieve high ethanol production and low by-product formation, resolving the technical contradiction.
2Productivity
If conventional yeast strains are used, then the fermentation process is simpler, but fermentation kinetics are slower
Solution Approach 1:
The patent changes the kinetic parameters of fermentation by introducing genes that encode enzymes with higher catalytic activity or altered regulation. This genetic modification accelerates the fermentation rate without requiring complex process changes, resolving the contradiction between productivity and strain complexity.
3Object-generated harmful factors
If conventional yeast strains are used, then the process is well-established, but acetaldehyde levels remain high
Solution Approach 1:
The patent modifies the metabolic parameters of the yeast by introducing genes that enhance the conversion of acetaldehyde to ethanol. This genetic parameter change directly reduces acetaldehyde levels in the fermentation broth, resolving the contradiction between harmful factor reduction and strain complexity.
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
These processes enhance ethanol production efficiency by increasing yields, reducing by-products, and accelerating fermentation, while also enabling effective oil recovery from ethanol production streams.
Implementation Method 1
liquefying the starch-containing material at a temperature above the initial gelatinization temperature using an alpha-amylase
Implementation Method 2
saccharifying using a glucoamylase
Implementation Method 3
fermenting using a fermenting organism where the fermenting organism is Saccharomyces cerevisiae
Data Source
AI summary
The present invention relates to processes for producing ethanol from starch-containing material by liquefying the starch-containing material at a temperature above the initial gelatinization temperature using an alpha-amylase; saccharifying using a glucoamylase and fermenting using a Saccharomyces cerevisiae yeast strain deposited under Accession No. V14/004037 at National Measurement Institute, Victoria, Australia) or a fermenting organism strain having properties that are about the same as that of the deposited Saccharomyces cerevisiae strain or a derivative of Saccharomyces strain V14/004037 having the defining characteristics of strain V14/004037. The invention also relates to a Saccharomyces yeast strain deposited under the Budapest Treaty and having NMI accession no. V14/004037 or a derivative of strain V14/004037 which exhibits one or more defining characteristics of strain V14/004037. The invention also relates to a process of recovering/extracting oil from an ethanol process of the invention using a Saccharomyces strain of the invention and compositions comprising a Saccharomyces yeast strain of the invention and naturally occurring and/or non-naturally occurring components.