Galactomannan Hydrolysis via Trichoderma reesei Fermentation
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Solution Overview
Problem
Current methods for producing small-molecule galactomannans (GMs) and galactomannan oligosaccharides (GMOS) using enzymatic hydrolysis face challenges due to high β-mannosidase activity, which reduces yields and increases production costs, particularly when using Trichoderma reesei for fermentation, as it also synthesizes β-mannosidase, necessitating costly purification steps.
Innovation Solution
A one-step fermentation process using Trichoderma reesei with microcrystalline cellulose (MCC) and melibiose as carbon sources to produce a special complex enzyme with a low β-mannosidase activity, allowing direct use for hydrolyzing GMs to GMs and GMOS without purification, optimizing the β-mannanase to α-galactosidase ratio for enhanced yields and reduced production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Trichoderma reesei is used for fermentation to produce β-mannanase, then the enzymatic hydrolysis of galactomannan is improved, but β-mannosidase is also synthesized which reduces the yield of small-molecule GM and GMOS
Solution Approach 1:
The patent extracts and removes β-mannosidase from the complex enzyme system produced by Trichoderma reesei fermentation. By separating the harmful enzyme component (β-mannosidase) from the useful enzyme (β-mannanase), the system achieves high hydrolysis efficiency while preventing excessive degradation of oligosaccharides into monosaccharides, thus maintaining high yields of small-molecule GM and GMOS.
Solution Approach 2:
The patent changes the enzymatic activity ratio parameter by controlling the fermentation process to achieve a specific ratio of β-mannanase to β-mannosidase activities (8:2 to 20:1). This parameter optimization ensures that β-mannanase dominates the enzyme system, enabling efficient hydrolysis while minimizing unwanted degradation by β-mannosidase.
2Quantity of substance
If β-mannosidase is removed through purification, then the yield of small-molecule GM and GMOS is improved, but the production cost increases
Solution Approach 1:
The patent applies preliminary action by controlling the fermentation process in advance to produce an enzyme system with an optimized ratio of β-mannanase to β-mannosidase activities. This preliminary optimization during fermentation reduces or eliminates the need for costly purification steps, as the enzyme system is already configured to achieve high yields without excessive degradation.
Solution Approach 2:
The patent changes the fermentation parameters (carbon sources, nitrogen sources, pH, temperature) to control the enzymatic activity ratio produced by Trichoderma reesei. By optimizing these parameters, the system produces an enzyme complex with the desired activity ratio directly, avoiding the need for expensive purification processes while maintaining high product yields.
3Stability of the object's composition
If galactose branched chains are present in GM, then the natural structure is maintained, but steric hindrance occurs which reduces the efficiency of β-mannanase degradation
Solution Approach 1:
The patent introduces α-galactosidase as an intermediary enzyme that specifically removes galactose residues from the GM structure before β-mannanase acts on the backbone. This intermediary action eliminates the steric hindrance caused by galactose branched chains, allowing β-mannanase to efficiently degrade the mannose backbone while preserving the overall structural integrity needed for producing small-molecule GM and GMOS.
Solution Approach 2:
The patent segments the degradation process into two distinct stages: first, α-galactosidase removes galactose side chains, and second, β-mannanase degrades the mannose backbone. This segmentation allows each enzyme to perform its function optimally without interference, improving overall degradation efficiency while maintaining control over the final product composition.
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 method effectively increases the yields of small-molecule GMs and GMOS while reducing production costs by minimizing β-mannosidase activity and allowing for direct use of the enzyme solution, improving the efficiency and cost-effectiveness of the enzymatic hydrolysis process.
Implementation Method 1
conducting fermentation with Trichoderma reesei as an enzyme-producing strain and microcrystalline cellulose (MCC) and melibiose as carbon sources
Implementation Method 2
the β-mannanase mainly degrades β-1,4-glycosidic bonds on a GM backbone to degrade a macromolecular polysaccharide into small molecules
Implementation Method 3
α-galactosidase is an enzyme that can specifically hydrolyze the α-1,6-glycosidic bond formed between mannose and galactose in a GM molecule
Data Source
AI summary
A method and special complex enzyme for hydrolyzing a galactomannan (GM) to prepare a small-molecule GM and a galactomannan oligosaccharide (GMOS) is provided. The method includes: conducting fermentation with microcrystalline cellulose (MCC) and melibiose as carbon sources and Trichoderma reesei (T. reesei) as an enzyme-producing strain to obtain a supernatant, which is a complex enzyme solution with enzymatic activities of β-mannanase and α-galactosidase; and directly using the complex enzyme solution for enzymatic hydrolysis of a GM as a substrate to prepare the small-molecule GM and the GMOS.