Simultaneous Enzyme Depolymerization and Fermentation of Starch
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Solution Overview
Problem
Current fermentation processes face inefficiencies when using starch as a carbohydrate source due to the inability of many microorganisms to metabolize starch directly, leading to wasted oligomeric polysaccharides and increased costs from incomplete hydrolysis and energy-intensive sterilization in simultaneous saccharification and fermentation processes.
Innovation Solution
A process involving a fermentation broth with a microorganism that ferments monosaccharides but not oligomeric saccharides, combined with an active enzyme that depolymerizes nonfermentable oligomeric saccharides to form fermentable monosaccharides, allowing for simultaneous depolymerization and fermentation under specific conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If starch is hydrolyzed to form a mixture containing mainly glucose, then the microorganism can ferment the monosaccharide efficiently, but complete hydrolysis adds significant cost and oligomeric polysaccharides are wasted
Solution Approach 1:
The patent combines the hydrolysis function (performed by enzymes like amylase) with the fermentation function (performed by microorganisms) in a single integrated process. The enzyme-treated starch is fed directly to the microorganism, which ferments the monosaccharides while the enzyme system simultaneously breaks down remaining oligomers, merging two separate functions into one unified operation that eliminates waste and reduces costs
Solution Approach 2:
The patent introduces enzymes as intermediary substances that mediate between the starch substrate and the microorganism. These enzymes (such as amylase, glucoamylase, and other glycosidases) act as biological catalysts that break down starch and oligomers into fermentable monosaccharides, enabling the microorganism to utilize the carbon source efficiently without requiring complete hydrolysis
2Productivity
If simultaneous saccharification and fermentation is used, then starch can be broken down and fermented simultaneously, but sterilization is energy-intensive and glucose deactivates enzymes
Solution Approach 1:
The patent performs preliminary starch hydrolysis and oligomer breakdown using enzymes before the fermentation phase. By pre-treating the starch with enzyme mixtures (amylase, glucoamylase, glycosidases), the substrate is converted into fermentable monosaccharides and low oligomers in advance, eliminating the need for energy-intensive sterilization of the entire starch-enzyme mixture and reducing enzyme deactivation issues
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
This approach enables efficient fermentation of inexpensive carbohydrate feedstocks with high yields of desired fermentation products, reducing energy costs and minimizing enzyme inactivation, while effectively utilizing starch hydrolyzates with high concentrations of glucose and oligomers.
Implementation Method 1
an effective amount of at least one active enzyme that depolymerizes at least one of said nonfermentable oligomeric saccharides to form a monosaccharide that is fermentable by the microorganism
Implementation Method 2
a microorganism that ferments the monosaccharide but does not ferment at said nonfermentable oligomeric saccharides
Data Source
AI summary
Sugar mixtures containing nonfermentable oligomers are fermented in the presence of certain enzymes that depolymerize the oligomers simultaneously with the fermentation process.