BPS-DVB Chromatography for Separating Neutral Oligosaccharides
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Solution Overview
Problem
Current methods for separating structurally similar hydrophilic neutral oligosaccharides, such as human milk oligosaccharides, are inefficient and not suitable for industrial-scale purification, particularly in fermentation broths, leading to significant contamination and low purity of the desired oligosaccharides.
Innovation Solution
The use of a hydrophobic stationary phase composed of bromine-functionalized polystyrene cross-linked with divinylbenzene (BPS-DVB) for chromatography to separate hydrophilic neutral oligosaccharides based on their molecular weight and structural differences, allowing for effective separation and purification of oligosaccharides like LNnT and pLNnH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional separation methods (ultrafiltration, ion exchange, gel filtration) are used to separate oligosaccharides from fermentation broth, then non-carbohydrate components can be removed, but the oligosaccharide components cannot be separated from each other significantly
Solution Approach 1:
The patent changes the fundamental parameter of the stationary phase from hydrophilic (conventional) to hydrophobic (brominated polystyrene-divinylbenzene). This parameter change enables the stationary phase to interact differently with oligosaccharides based on their hydrophobicity, which varies with molecular weight and structure,从而实现有效分离
Solution Approach 2:
The patent uses a composite stationary phase material consisting of polystyrene cross-linked with divinylbenzene and functionalized with bromine. This composite material combines the mechanical stability of cross-linked polystyrene with the enhanced hydrophobic interaction capability of bromine functional groups, enabling superior separation performance
2Manufacturing precision
If gel filtration is used to separate structurally close oligosaccharides, then separation can be achieved, but it is considered a laboratory method rather than industrially profitable
Solution Approach 1:
The patent transitions from size-based separation (gel filtration) to hydrophobicity-based separation by changing the stationary phase chemistry. This allows the use of conventional chromatography equipment at industrial scale while achieving separation of structurally close oligosaccharides that gel filtration cannot resolve
Solution Approach 2:
The patent replaces the mechanical size-exclusion mechanism of gel filtration with chemical hydrophobic interaction mechanisms. This substitution enables the use of more compact, scalable chromatography systems rather than requiring large-volume gel filtration columns
3Quantity of substance
If conventional chromatography with hydrophilic stationary phases is used, then oligosaccharides can be retained, but separation based on molecular weight differences is not achieved
Solution Approach 1:
The patent fundamentally changes the stationary phase parameter from hydrophilic to hydrophobic by introducing bromine functional groups. This creates hydrophobic interaction forces that vary with the hydrophobic character of different oligosaccharides, enabling separation by molecular weight and structure while maintaining retention
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 BPS-DVB chromatography method achieves high purity and enrichment of target oligosaccharides, suitable for industrial-scale operations, with robust performance and reduced microbial growth risks, and allows for the recovery of high-purity human milk oligosaccharides.
Implementation Method 1
treating the aqueous medium by chromatography using a hydrophobic stationary phase which is a polystyrene cross-linked with divinylbenzene (PS-DVB) and functionalized with bromine on the aromatic ring
Implementation Method 2
treating the aqueous medium by chromatography using a hydrophobic stationary phase
Data Source
AI summary
The invention relates to a method for the separation of two hydrophilic neutral oligosaccharides from each other with a chromatography on a bromine functionalized polystyrene cross-linked with divinylbenzene (BPS-DVB) stationary medium.