Controlled Polymer-Grafted Anion Exchange Particles for RNA Resolution

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Solution Overview

Problem

Existing ion exchange chromatographic materials face challenges with poor control over surface density of ionic functionalities and polymer chain lengths, leading to low efficiency, batch inconsistency, and poor performance in separating large nucleic acids like RNA and DNA fragments.

Innovation Solution

Anion exchange chromatographic particles with a non-porous core coated by a hydrophilic polymer and surface-grafted polyionic chains are developed through a controlled grafting process, ensuring precise control over surface functionalities and architecture.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional free radical polymerization methods are used for preparing ion exchange stationary phases, then a wide range of silica, silica-polymer hybrid, or polymer-based ion exchange stationary phases can be fabricated, but poor control over surface density of ionic functionalities and polymer chain lengths is achieved

Engineering Contradiction:

Improverange of ion exchange stationary phasesVSAvoidcontrol over surface density and chain lengths

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent employs controlled radical polymerization techniques (ATRP, RAFT, NMP) that enable precise control over polymerization parameters including initiation rate, propagation rate, and termination. This allows systematic adjustment of polymer chain length distribution and surface density of ionic functionalities, directly resolving the precision control issue while maintaining versatility in stationary phase fabrication

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces conventional free radical polymerization with controlled radical polymerization mechanisms. This substitution introduces reversible deactivation pathways that control radical activity, enabling precise temporal and spatial control over polymer growth. The result is uniform polymer chains with controlled lengths and predictable surface functionality distribution, eliminating the uncontrolled nature of conventional methods

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Adaptability or versatility

If organic chromatographic materials are used, then flexibility in mobile phase pH choice is achieved, but columns show shrinking and swelling when mobile phase composition changes

Engineering Contradiction:

Improvemobile phase pH flexibilityVSAvoidcolumn dimensional stability

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The patent creates composite chromatographic materials combining organic polymer chains with inorganic silica cores. The silica core provides dimensional stability and resistance to swelling/shrinking, while the grafted organic polymer chains provide pH flexibility and ion exchange functionality. This composite structure resolves the contradiction by assigning different functional requirements to different material components

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent applies local quality differentiation by derivatizing only the surface region of the silica core with polymer chains bearing ionic functionalities. The bulk silica core maintains structural stability, while the surface polymer layer provides pH adaptability. This spatial differentiation of properties allows simultaneous achievement of dimensional stability and chemical flexibility

Inventive Principle:

Principle #3Local quality

3Reliability

If conventional ion exchange chromatographic materials are used, then general ion exchange capability is achieved, but poor performance in separating large nucleic acids is observed

Engineering Contradiction:

Improveion exchange capabilityVSAvoidseparation efficiency for large nucleic acids

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent optimizes polymer chain parameters including length, density, and ionic group composition specifically for large nucleic acid separation. By controlling polymerization conditions, the patent creates polymer chains with optimal hydrodynamic volumes and charge densities that enhance interaction with large nucleic acids while maintaining general ion exchange capability. This parameter optimization directly improves separation efficiency for large biomolecules

Inventive Principle:

Principle #35Parameter changes

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 particles provide high resolution separations for large nucleic acids, improving recovery, reducing carry-over, and enhancing batch-to-batch consistency and column lifetime.

Implementation Method 1

Anion exchange chromatography (AEX) separates molecules based on the differences in number and localization of negative surface charges of an analyte

Methodology Applied

Scientific EffectAnion exchange: Ion Exchange

Data Source

PatentUS20250325974A1Anion exchange chromatographic particles with controlled grafted polymer chains

Publication Date: 2025.10.23 WATERS TECHNOLOGY CORP

AI summary

The present disclosure pertains to compositions comprising a non-porous particle core coated with a hydrophilic polymer with surface-grafted polyionic chains. In some aspects, the present disclosure pertains to chromatographic separation devices that comprise such compositions. In some further aspects, the present disclosure pertains to chromatographic methods that comprise: (a) loading a sample onto a chromatographic column comprising such compositions and (b) flowing a mobile phase through the column.