Feruloyl Esterase Refining for Cellulosic Saccharification
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Solution Overview
Problem
Pretreatment of cellulosic materials for ethanol production introduces impurities that inhibit cellulase enzymes and reduce enzymatic hydrolysis efficiency, necessitating a method to improve the refining process for saccharification.
Innovation Solution
A process involving the separation of a liquor from pretreated cellulosic material, contact with feruloyl esterase, and recycling it to refine the material, thereby reducing or eliminating toxic esters that hinder hydrolysis, using specific enzymes with sequences similar to SEQ ID NOS: 133, 134, 135, or 136, and performing treatments under controlled conditions of pH, temperature, and enzyme dosage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pretreatment is applied to cellulosic materials to enable enzymatic hydrolysis, then the material becomes accessible to enzymes, but impurities are introduced that inhibit cellulase enzymes and reduce hydrolysis efficiency
Solution Approach 1:
The feruloyl esterase treatment is applied as a preliminary step before the main enzymatic hydrolysis process. By removing ester toxins in advance through the feruloyl esterase enzyme treatment of the liquor, the subsequent cellulase hydrolysis proceeds without inhibition, thus improving overall productivity
Solution Approach 2:
The feruloyl esterase enzyme acts as an intermediary that mediates between the pretreated cellulosic material and the cellulase enzymes. It removes harmful ester compounds from the liquor, creating a favorable environment for cellulase action without directly participating in the hydrolysis of cellulose itself
2Reliability
If feruloyl esterase is used to remove toxic esters from pretreated cellulosic material, then enzymatic hydrolysis performance improves, but additional process steps and enzyme dosage requirements are introduced
Solution Approach 1:
The feruloyl esterase treatment is merged with the existing liquor separation and recycling process. The enzyme is added to the liquor stream that is already being separated from pretreated material and recycled back to the pretreatment step, combining detoxification with an existing unit operation
Solution Approach 2:
The system uses its own recycled liquor as the medium for feruloyl esterase treatment. The liquor that is separated from pretreated material serves dual purposes: it is recycled back to pretreatment and simultaneously used as the reaction medium for ester removal, making the system self-sufficient
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 process enhances enzymatic hydrolysis performance by reducing ester toxins, improving the yield of fermentable sugars, and increasing the efficiency of saccharification, allowing for effective conversion of pretreated cellulosic materials into fermentation products.
Implementation Method 1
contacting the liquor with feruloyl esterase... The feruloyl esterase reduces and/or eliminates toxic esters that inhibit hydrolysis of pretreated cellulosic materials
Data Source
AI summary
The present invention relates to processes for processes for enzymatic refining of a pretreated cellulosic material for saccharification.