Polymer-Coated CPG Particles for Oligonucleotide Synthesis
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Solution Overview
Problem
Current solid supports for oligonucleotide synthesis, such as controlled porosity glass (CPG) and polystyrene-based particles, face limitations in loading capacity and mechanical stability, leading to compromised yields and compressibility issues.
Innovation Solution
A method for coating CPG particles with a conformal polymeric coating using vinylbenzylchloride, acrylics, or styrene, along with a crosslinking agent, to create a polymer-coated CPG with enhanced mechanical stability and loading capacity, maintaining pore size and volume while allowing for effective nucleoside attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If high pore size CPG particles are used, then synthesis is facilitated, but loading capacity decreases
Solution Approach 1:
The invention creates a composite material by coating CPG particles with a polymeric layer containing reactive groups. The CPG core provides high pore size for easy synthesis, while the polymeric coating provides increased loading capacity through additional reactive groups. This composite structure combines the advantages of both materials to resolve the contradiction between synthesis ease and loading capacity.
2Quantity of substance
If polymeric supports are used to increase loading capacity, then more nucleosides can be loaded, but mechanical stability decreases
Solution Approach 1:
The CPG core provides mechanical stability and structural integrity, while the polymeric coating provides increased nucleoside loading capacity. The composite structure allows the rigid CPG support to bear mechanical loads while the softer polymeric layer provides additional functional groups for nucleoside attachment, resolving the contradiction between strength and loading capacity.
Solution Approach 2:
The polymeric coating is applied only as a surface layer on the CPG particles, providing localized increased loading capacity at the surface while the bulk CPG material maintains its mechanical strength. This local modification allows the system to gain loading capacity without sacrificing overall structural integrity.
3Quantity of substance
If polystyrene of intermediate crosslinking is used, then loading capacity increases, but compressibility increases
Solution Approach 1:
The CPG core provides dimensional stability and resistance to compression, while the polymeric coating provides increased loading capacity. The composite structure allows the system to achieve higher loading capacities without the compressibility problems associated with highly crosslinked polystyrene supports.
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 polymer-coated CPG particles exhibit increased loading capacities and mechanical stability, supporting higher yields in oligonucleotide synthesis without significant pore size reduction, addressing the limitations of traditional CPG and polystyrene-based supports.
Implementation Method 1
mixing the cooled CPG particles and a cold solution comprising a polymer forming coating compound
Implementation Method 2
combining the mixture and a crosslinking agent in a solution comprising a second solvent
Implementation Method 3
rapidly removing the first solvent, while maintaining the CPG mixture at a temperature below about 10 °C
Implementation Method 4
heating the CPG mixture to a temperature of about 38 to about 65°C under an inert gas, to permit formation of the coated CPG particles
Data Source
AI summary
A method for preparing a crosslinked polymer coated controlled porosity glass (CPG) particle is provided. The method involves mixing CPG particles in a solution comprising polyvinylbenzylchloride and a first solvent at a temperature below 10 °C. A second solvent is added and a crosslinking agent is added to the mixture. The first solvent is removed rapidly within 1 1/2 hours of addition of the crosslinking agent. The crosslinking reaction is permitted to proceed and the mixture is then cooled and treated to remove any remaining solvent. The resulting coated CPG particles are washed and dried. Also provided a polymer coated CPG particles using for loading ligand thereon.