Sequential Fermentation for Oligosaccharide Purity
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Solution Overview
Problem
Current methods for producing prebiotic oligosaccharides, particularly human milk oligosaccharides, face challenges such as high costs, low purity, and inefficiencies due to the formation of by-products in fermentative processes, making large-scale industrial production difficult.
Innovation Solution
A process involving genetically engineered microbial cells that utilize intermediate oligosaccharides with at least three monosaccharide moieties, allowing for sequential fermentation steps to minimize by-product formation and enhance purity, using specific saccharide importers and enzymes to synthesize desired oligosaccharides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional chemical synthesis or single-step fermentative production is used, then production cost and simplicity are improved, but product purity deteriorates due to by-product formation
Solution Approach 1:
The patent divides the oligosaccharide production process into multiple sequential fermentation steps, where each step is responsible for adding specific monosaccharide units. This segmentation allows for controlled synthesis that minimizes by-product formation while maintaining high purity, resolving the contradiction between process complexity and product purity.
Solution Approach 2:
The patent employs preliminary fermentation steps that produce intermediate oligosaccharides before the final desired product is synthesized. These intermediate products serve as substrates for subsequent steps, allowing the system to build complexity gradually and maintain purity by controlling each step separately.
2Manufacturing precision
If multi-step synthesis is used, then product purity is improved, but production time and cost increase
Solution Approach 1:
The patent implements continuous fermentation processes where intermediate oligosaccharides are directly fed into subsequent steps without interruption or extensive purification between steps. This continuous operation maintains high purity while minimizing idle time and reducing overall production cycle time.
Solution Approach 2:
The patent uses intermediate oligosaccharides as mediators that bridge different fermentation steps. These intermediates are produced in one step and immediately utilized in the next step, creating an efficient flow that reduces total production time while maintaining the purity benefits of multi-step synthesis.
3Productivity
If by-products are formed during fermentation, then production yield is improved, but product purity deteriorates
Solution Approach 1:
The patent applies specific enzymatic activities to specific steps of the synthesis pathway, where each enzyme is selected for its high specificity to produce only the desired monosaccharide unit addition. This local optimization of enzymatic quality minimizes by-product formation while maintaining high yield of the target oligosaccharide.
Solution Approach 2:
The patent converts potential harmful by-products into useful intermediates by designing the fermentation pathway so that substances that would normally be waste products are instead utilized as substrates for subsequent synthesis steps, thereby maintaining high purity while preserving productivity.
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 reduces the presence of undesired by-products, achieving higher purity and cost-effectiveness in producing desired oligosaccharides, such as human milk oligosaccharides, suitable for commercial-scale production.
Implementation Method 1
a saccharide importer which facilitates uptake of an intermediate oligosaccharide by the genetically engineered microbial cell
Implementation Method 2
an enzyme which is able to transfer a monosaccharide moiety from a donor substrate to the intermediate oligosaccharide
Implementation Method 3
sequential fermentation steps to minimize by-product formation and enhance purity
Data Source
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AI summary
Disclosed is a process for the production of a desired oligosaccharide, the process comprises providing a genetically engineered microbial cell which possesses a saccharide importer for the uptake of an intermediate oligosaccharide, and an enzyme being able to convert the intermediated oligosaccharide by transferring a monosaccharide moiety from a donor substrate to the intermediate oligosaccharide; cultivating the genetically engineered microbial cell in the presence of an intermediate oligosaccharide to generate the desired oligosaccharide; and retrieving the desired oligosaccharide.