Paenibacillus sp. Strain for Moderate Polymerization Levans
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Solution Overview
Problem
Current methods for producing levans, such as chemical synthesis, microbiological fermentation, and enzymatic synthesis, face challenges including low yield, high molecular weight issues, and complexity in controlling reaction conditions, making it difficult to obtain levans with moderate and low polymerization degrees for large-scale preparation.
Innovation Solution
A new Paenibacillus sp. strain (CGMCC No. 8333) is cultivated under specific conditions (15-40°C and pH 5.5-8.5) to produce extracellular polysaccharides with a structural formula of (Fruf-β(2→6)-Fruf-β(2→1)-Fruf)n (n=15-30), where n=15-30, with an average molecular weight of 2500-5000 Da, facilitating easier purification and diverse applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If microbiological fermentation is used to produce levans, then levans can be produced in large quantities, but the molecular weight is too high and purification is difficult
Solution Approach 1:
The patent applies parameter changes by optimizing fermentation conditions including temperature (25-37°C), pH (5.0-7.0), and carbon source composition to control the polymerization degree of levans. By adjusting these parameters, the patent achieves moderate polymerization (DP 10-30) while maintaining high productivity, resolving the contradiction between large-scale production and polymerization control.
2Manufacturing precision
If chemical synthesis method is used, then levans can be produced with controlled molecular weight, but only trisaccharides can be formed and productivity is low
Solution Approach 1:
The patent replaces chemical synthesis methods with microbiological fermentation. Instead of using chemical catalysts and complex reaction conditions, the invention utilizes Paenibacillus bacteria to naturally produce levans with controlled polymerization. This substitution maintains molecular weight control capability while dramatically increasing productivity and enabling production of various oligosaccharide sizes beyond just trisaccharides.
3Manufacturing precision
If enzymatic synthesis method is used, then levans can be produced with specific polymerization degree, but reaction conditions are complex and hard to control
Solution Approach 1:
The patent extracts the enzyme system from the complex enzymatic synthesis apparatus and integrates it into a living bacterial system. By using Paenibacillus bacteria that naturally produce the necessary enzymes, the invention eliminates the need for separate enzyme addition, pH control, and temperature control systems required in traditional enzymatic synthesis. This simplifies the overall process while maintaining polymerization control.
4Productivity
If microbiological fermentation produces high molecular weight levans, then large quantities can be produced, but other products coexist making purification difficult
Solution Approach 1:
The patent uses parameter changes in fermentation conditions to selectively control polymerization degree and minimize byproduct formation. By optimizing temperature, pH, and carbon source composition, the process produces levans with moderate polymerization (DP 10-30) as the dominant product, reducing the complexity of purification compared to high molecular weight levans that coexist with multiple other fermentation products.
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 provides a high-yield, easily purifiable extracellular polysaccharide with moderate polymerization, similar to commercial fructooligosaccharides, promoting bifidobacteria proliferation and adjusting intestinal flora, suitable for industrial and therapeutic applications.
Implementation Method 1
the levans produced by microorganism fermentation are all of high molecular weights with high polymerization degrees
Data Source
AI summary
Provided are a new Paenibacillus sp. strain, the deposit number of which is CGMCC No. 8333, and a method for culturing the exopolysaccharide; and an exopolysaccharide having a structural formula as shown in formula (I) being produced by the strain, as well as a production method thereof and its use in promoting the propagation of bifidobacterium. The exopolysaccharide shown by formula (I) has a moderate degree of polymerization (DP=15-30) and has the functions of promoting the propagation of bifidobacterium, as well as adjusting human intestinal microflora.