Dual-Modified SEC Porous Material for Low Nonspecific Interaction

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing stationary phase materials for size exclusion chromatography suffer from non-specific interactions, leading to peak broadening, tailing, and loss of resolution due to ionic and hydrophobic interactions, despite surface modifications like diol-bonding and PEG coatings, which still require complex mobile phase development.

Innovation Solution

A material surface is modified with a combination of polyethylene glycol (PEG) functionality and diol functionality at specific coverage densities to enhance resistance to non-specific interactions, using hydroxy-terminated or alkoxy-terminated PEG-alkylsilanes and diol-terminated alkylsilanes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If surface modification with diol-bonding is applied, then non-specific interactions are reduced, but hydrophobic secondary interactions continue to exist and mobile phase development becomes tedious

Engineering Contradiction:

Improvenon-specific interactionsVSAvoidmobile phase development

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent applies composite surface modification by combining two different functional groups (diol and PEG) on the stationary phase surface. This composite approach leverages the hydrophilic properties of both groups to create a synergistic effect that more effectively eliminates hydrophobic secondary interactions compared to single modification, thereby simplifying mobile phase development while maintaining reduced non-specific interactions.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent changes the surface chemical parameters by introducing PEG functionality with specific coverage density (at least 0.05 μmol/m2) in addition to diol groups. This parameter change in surface composition alters the hydrophilic character of the stationary phase, making it more resistant to hydrophobic interactions and reducing the complexity of mobile phase optimization.

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If surface modification with PEG is applied, then resistance to non-specific interactions is enhanced, but coverage density must be maintained at specific levels to ensure effectiveness

Engineering Contradiction:

Improvenon-specific interactionsVSAvoidcoverage density control

Core Design Contradiction:

Object-affected harmful factorsVSManufacturing precision

Solution Approach 1:

The patent specifies a minimum coverage density threshold (at least 0.05 μmol/m2) for PEG functionality rather than requiring precise optimal values. This partial action approach ensures effective reduction of non-specific interactions by meeting a sufficient threshold level, providing manufacturing tolerance and reducing precision requirements while maintaining functional effectiveness.

Inventive Principle:

Principle #16Partial or excessive action

3Object-affected harmful factors

If dual surface modification with PEG and diol is applied, then resistance to hydrophobic non-specific interactions is further enhanced, but manufacturing complexity increases

Engineering Contradiction:

Improvehydrophobic non-specific interactionsVSAvoidsurface modification process

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent merges two surface modification approaches (diol-bonding and PEG coating) into a single dual-modified stationary phase. By combining these modifications, the patent achieves enhanced resistance to hydrophobic non-specific interactions through synergistic hydrophilic effects, while the merged structure provides consistent performance across varying method parameters.

Inventive Principle:

Principle #5Merging (Combining)

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 dual-modified surface significantly reduces non-specific interactions, improving chromatographic separation efficiency and maintaining resolution across varying method parameters, as demonstrated by reduced tailing and improved peak shape in SEC separations.

Implementation Method 1

PEGs are generally hydrophilic in nature, electrical neutral, and possess hydrogen-bond acceptor/donor properties. In addition, PEG surface modification provides a stable hydration layer through hydrogen bonds with nearby water.

Methodology Applied

Scientific EffectHydrogen bonding:

Implementation Method 2

Surface modification with polar groups is a very common strategy to reduce non-specific interactions, for example, in size exclusion chromatography.

Methodology Applied

Scientific EffectPolar interaction:

Data Source

PatentUS12551864B2Double surface modified porous material with minimized nonspecific interaction

Publication Date: 2026.02.17 WATERS TECHNOLOGY CORP

AI summary

The present disclosure is directed to surface modified materials such as stationary phase materials for performing size exclusion chromatography. Aspects of the present disclosure feature materials surface modified with a moiety including a polyethylene glycol (PEG) functionality and a moiety comprising a diol functionality. Such surface modified materials exhibit a reduced propensity for ionic and hydrophobic secondary interactions.