Composite Chromatography Particles for High-pH Column Stability
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Solution Overview
Problem
Chromatographic separation technologies face challenges with silica-based stationary phases that dissolve at high pH, leading to column failure, and polymer-based materials have limitations in column efficiency, especially for small molecules, necessitating a stable chromatographic material that maintains integrity under prolonged high pH conditions.
Innovation Solution
The development of superficially porous composite particles with a non-porous polymer core, a non-porous hybrid organic-inorganic material, and a porous inorganic material, which provides stability and reduces silica core dissolution, enhancing retention and separation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If silica-based stationary phases are used, then stability at neutral pH and high temperature is improved, but stability at high pH deteriorates due to particle erosion caused by dissolution
Solution Approach 1:
The patent applies composite materials by creating a core-shell structure where a silica core is coated with a polymer shell. This composite structure combines the thermal stability of silica with the high pH stability of polymer materials, resolving the contradiction between temperature stability and pH stability.
Solution Approach 2:
The patent uses a polymer shell (thin film) coating the silica core. This flexible shell protects the silica core from direct contact with high pH mobile phases, preventing dissolution while allowing the core to provide thermal stability.
2Reliability
If polymer-based stationary particles are used, then high pH stability is improved, but column efficiency deteriorates especially in the separation of small molecules
Solution Approach 1:
The patent applies local quality by creating different functional zones: the silica core provides thermal stability and structural integrity, while the polymer shell provides high pH stability. The shell thickness and porosity are locally optimized to maintain column efficiency for small molecule separation while ensuring high pH stability.
3Reliability
If hybrid organic-inorganic coating is applied to improve high pH stability, then prolonged high pH exposure stability deteriorates due to solid silica core dissolution
Solution Approach 1:
The patent uses a polymer shell (thin film) as a protective barrier between the silica core and the high pH mobile phase. This shell prevents direct contact and dissolution of the silica core, thereby extending column lifetime under prolonged high pH conditions.
Solution Approach 2:
The core-shell composite structure combines the advantages of both materials: the silica core provides thermal stability and the polymer shell provides high pH stability, preventing core dissolution and extending column lifetime.
Data Source
AI summary
The present disclosure pertains to composite particles with polymer-based cores, which eliminate the high pH failure mechanism of silica-based core-shell silica particles. In various embodiments, a non-porous polymer core is surface modified. In various embodiments, a non-porous hybrid organic-inorganic material is in contact with the modified surface of the core, and a porous inorganic material is in contact with the non-porous hybrid organic-inorganic material. The present disclosure pertains to chromatographic separation devices that comprise such composite particles.