Charged Reversed-Phase Materials for Glycan Resolution
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Solution Overview
Problem
Conventional methods for analyzing glycans, such as HPLC chromatography, lack sufficient sensitivity and selectivity due to the hydrophilic and polar nature of glycans, leading to poor resolution and co-elution issues, especially for N-glycans and O-glycans, which are crucial for biopharmaceutical quality control.
Innovation Solution
The use of high purity chromatographic materials (HPCMs) with a hydrophobic surface and ionizable modifiers, excluding quaternary ammonium ions, to selectively adsorb glycans labeled with amphipathic, strongly basic moieties, allowing for improved separation and detection through chromatographic methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional HPLC chromatography methods are used to analyze glycans, then the analysis can be performed with standard equipment, but the sensitivity and resolution are insufficient due to the hydrophilic and polar nature of glycans
Solution Approach 1:
The patent changes the chemical parameters of the stationary phase by introducing ionizable modifiers (weakly basic groups with pKa 6-10) to the hydrophobic C18 surface, creating a charged surface that interacts with the polar glycans through electrostatic attraction, thereby improving sensitivity and resolution without requiring complex equipment changes
Solution Approach 2:
The patent creates a composite stationary phase combining hydrophobic C18 groups with ionizable weakly basic modifiers on the silica surface, forming a dual-function material that provides both hydrophobic interaction and electrostatic attraction, enabling superior separation of polar glycans
2Measurement precision
If glycans are labeled with amphipathic, strongly basic moieties to increase method sensitivity, then detection sensitivity improves, but the glycans become too strongly retained and insufficiently resolved
Solution Approach 1:
The patent changes the pH and ionization state parameters by using a mobile phase at pH 2.5-4.0, which protonates the weakly basic stationary phase groups, reducing their positive charge density and thereby reducing the electrostatic attraction to the basic glycans, allowing elution while maintaining separation
Solution Approach 2:
The patent creates local charge density variations on the stationary phase surface through the use of weakly basic groups that can be selectively protonated, providing localized interaction zones that differentiate between glycans based on their local charge distribution rather than just overall charge
3Adaptability or versatility
If reversed phase stationary phases bonded with C18 are used, then hydrophobic interactions occur, but separations produce problematic co-elutions due to poor selectivity among glycan structures differing with respect to net charge
Solution Approach 1:
The patent merges two interaction mechanisms - hydrophobic interaction from C18 groups and electrostatic attraction from ionizable weakly basic groups - into a single stationary phase, creating a multimodal system that simultaneously exploits both hydrophobic and charge-based differences in glycans for superior separation
Solution Approach 2:
The patent changes the electrostatic parameter of the stationary phase by incorporating weakly basic groups with pKa 6-10, which can be tuned through mobile phase pH, allowing dynamic adjustment of the electrostatic interaction strength to optimize selectivity for different glycan charge states
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 HPCMs provide enhanced selectivity and resolution for glycans, enabling accurate analysis and detection, particularly for N-glycans and O-glycans, essential for ensuring the quality and consistency of therapeutic products.
Implementation Method 1
the chromatographic surface comprises a hydrophobic surface group
Implementation Method 2
the chromatographic surface comprises a hydrophobic surface group and one or more ionizable modifiers
Implementation Method 3
selectively adsorb glycans labeled with amphipathic, strongly basic moieties
Data Source
AI summary
The present invention provides novel methods for the chromatographic analysis of glycans using high purity chromatographic materials comprising a chromatographic surface wherein the chromatographic surface comprises a hydrophobic surface group and one or more ionizable modifier and a labeling reagent which is capable of providing amphipathic and strongly base labeling moieties to a sample to be analyzed.