Polymer Particles with Controlled Size and High Diffusivity
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Solution Overview
Problem
Existing methods for nucleic acid analysis, such as hybrid selection, in-gel PCR, and emulsion PCR, face limitations including amplicon format, reagent access, and fragment density, which hinder signal-to-noise ratios and sequencing efficiency due to the use of solid beads that lack diffusivity and have inconsistent size distributions.
Innovation Solution
The development of novel methods for making polymer particles and scaffold nucleic acid polymer particles (SNAPPs) through forming an aqueous gel reaction mixture, creating an emulsion with dispersed micelles, adding a polymerization initiator, and performing polymerization in the micelles, which results in polyacrylamide particles with controlled size and high diffusivity, enabling efficient analyte and reporter molecule diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid beads are used as particulate supports, then amplicons can be spatially concentrated for enhanced signal-to-noise ratios, but the solid structure lacks diffusivity for efficient analyte and reporter molecule diffusion
Solution Approach 1:
The patent employs porous polymer particles with controlled pore structures that enable both spatial concentration of amplicons on the particle surface and efficient diffusion of analytes and reporter molecules through the porous interior. The porosity allows reagents to access trapped amplicons while maintaining high local concentration for signal enhancement.
Solution Approach 2:
The invention uses composite particulate supports combining polymer matrices with porous structures, creating materials that simultaneously provide surface area for amplicon attachment and internal pathways for reagent diffusion. This composite structure resolves the contradiction between concentration and diffusivity.
2Ease of manufacture
If traditional bead production methods are used, then particles can be formed, but they exhibit widely varying size distributions particularly at lower size ranges
Solution Approach 1:
The patent employs preliminary emulsion formation with pre-defined droplet sizes before polymerization. By controlling the emulsification process and using standardized droplet generation methods, particles with narrow size distributions are formed from the outset, eliminating the need for post-formation size control.
Solution Approach 2:
The invention systematically controls emulsion parameters including surfactant concentrations, agitation speeds, and droplet generation conditions to produce polymer particles with consistent sizes. By optimizing these parameters, the method achieves narrow size distributions across different particle size ranges.
3Ease of operation
If amplicons are placed on bead surfaces, then spatial concentration is achieved, but fragment density is insufficient for adequate signal-to-noise ratios
Solution Approach 1:
The patent implements a nested structure where amplicons are trapped within the porous interior of polymer particles rather than merely attached to surfaces. This nesting allows high local concentration of fragments within the particle volume, achieving both spatial confinement and high fragment density for enhanced signals.
Solution Approach 2:
The invention transitions from two-dimensional surface attachment to three-dimensional volume utilization by trapping amplicons throughout the porous particle interior. This dimensional expansion increases the effective capacity for fragment concentration while maintaining spatial organization.
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
This approach produces polymer particles and SNAPPs with improved sequencing quality, higher template loads, and reduced primer damage, achieving higher signal-to-noise ratios and more consistent particle sizes, enhancing the efficiency of nucleic acid analysis.
Implementation Method 1
adding an initiator oil comprising at least one polymerization initiator to the continuous phase; and performing a polymerization reaction in the micelles
Implementation Method 2
forming an emulsion comprising dispersed aqueous phase micelles of gel reaction mixture in a continuous phase
Implementation Method 3
The gel particles have the advantage of increasing diffusivity of analytes and reporter molecules through the gel-based material
Data Source
AI summary
The disclosure relates to methods of making polymer particles, said methods including the steps of: making an aqueous gel reaction mixture; forming an emulsion having dispersed aqueous phase micelles of gel reaction mixture in a continuous phase; adding an initiator oil comprising at least one polymerization initiator to the continuous phase; and performing a polymerization reaction in the micelles. Further, the initiator oil is present in a volume % relative to a volume of the aqueous gel reaction mixture of between about 1 vol % to about 20 vol %. The disclosure also relates to methods of making nucleic acid polymer particles having the same method steps and wherein the aqueous gel reaction mixture includes a nucleic acid fragment, such as a primer.