Diol-Phase LC Separation of Procyanidin Oligomers
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Solution Overview
Problem
Current HPLC processes for separating procyanidin oligomers face safety concerns due to the use of hazardous solvents like methylene chloride and tetrahydrofuran, and they are not suitable for analytical laboratories with binary pumps, leading to variable column reproducibility and reduced peak intensities.
Innovation Solution
A diol-phase liquid chromatography process using a binary mobile phase comprising a polar aprotic solvent and a polar protic solvent, which allows for the separation and recovery of individual polar protic monomers and oligomers based on degree of polymerization, avoiding hazardous solvents and suitable for use with binary HPLC pumps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If current HPLC processes use hazardous solvents like methylene chloride and tetrahydrofuran for separating procyanidin oligomers, then separation effectiveness is improved, but safety concerns and environmental harm increase
Solution Approach 1:
The patent changes the chemical parameters of the mobile phase by replacing hazardous solvents (methylene chloride, tetrahydrofuran) with safer alternatives (acetonitrile, methanol, water, acetic acid) while maintaining separation effectiveness through optimized gradient elution programs and pH control
Solution Approach 2:
The patent employs commonly available, non-hazardous solvents that are easier to handle and dispose of safely, replacing expensive and hazardous chemical substances with more benign alternatives that achieve comparable or superior separation results
2Manufacturing precision
If current HPLC processes use complex mobile phases, then separation quality is improved, but device complexity and operational difficulty increase
Solution Approach 1:
The patent segments the mobile phase into two simple components (acetonitrile and aqueous methanol with acetic acid) that can be easily mixed and pumped through binary HPLC systems, replacing complex multi-solvent systems while maintaining separation quality through gradient elution
Solution Approach 2:
The patent creates a universal mobile phase system using common solvents that can be used with standard binary HPLC pumps and are compatible with various detectors, making the method widely applicable and operationally simple
3Manufacturing precision
If current HPLC processes use certain solvents and columns, then oligomer separation is improved, but column reproducibility and peak intensity are reduced
Solution Approach 1:
The patent changes the mobile phase pH and solvent composition parameters to reduce adsorption interactions between procyanidin oligomers and the silica column surface, thereby improving peak intensity and column reproducibility while maintaining separation resolution
Solution Approach 2:
The patent introduces acetic acid as an intermediary substance in the mobile phase that modifies the interaction between the oligomers and column stationary phase, reducing unwanted adsorption and improving chromatographic performance
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 process provides improved separation and recovery of procyanidin oligomers, reduces adsorption issues, and is scalable, making it safer, more environmentally friendly, and adaptable for use in analytical laboratories, with enhanced peak resolution and speciation capabilities.
Implementation Method 1
separating the individual monomer(s) and/or oligomer(s), on the basis of degree of polymerization, by passing a binary mobile phase comprising an A phase consisting essentially of a polar aprotic solvent and a B phase consisting essentially of a polar protic solvent through the column
Data Source
AI summary
An improved process for separating and isolating individual polar protic monomer(s) and/or oligomer(s) on the basis of degree of polymerization. A liquid sample containing polar protic monomer(s) and/or oligomer(s) is introduced into a liquid chromatography (LC) column packed with a polar bonded stationary chromatographic phase. The individual polar protic monomer(s) and/or oligomer(s) are separated via a binary mobile phase elution. One or more individual fractions containing the monomer(s) and/or oligomer(s) are eluted. The polar protic monomer(s) and/or oligomer(s) may be proanthocyanidins, hydrolyzable tannins, oligosaccharides, oligonucleotides, peptides, acrylamides, polysorbates, polyketides, poloxamers, polyethylene glycols, polyoxyethylene alcohols or polyvinyl alcohols. The binary mobile phase comprises an A phase consisting essentially of a polar aprotic solvent and a B phase consisting essentially of a polar protic solvent.A process for separating and isolating xanthine(s) (e.g., caffeine and theobromine) from polar protic monomer(s) and/or oligomer(s). A liquid sample containing xanthine(s) and polar protic monomer(s) and/or oligomer(s) is introduced into an LC column packed with a polar bonded stationary chromatographic phase. The xanthines are separated via an isocratic mobile phase elution, and one or more individual fractions containing the xanthines are eluted.