Macroporous Beads for Multiplex Assay Sensitivity
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Solution Overview
Problem
Existing multiplex assays, such as flow cytometry and xMAP technology, do not effectively utilize macroporous microspheres for quantitative single or multiplexed biological assays, leading to limitations in detection time and sensitivity.
Innovation Solution
The use of macroporous particles synthesized through methods like seeded emulsions, dispersion polymerizations, and mini-emulsions, with low crosslinker levels to incorporate distinguishable fluorochromes or magnetic materials, enhancing surface area and signal detection in multiplex assays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If suspension polymerization with inert diluent is used to produce macroporous microspheres, then porous structure is achieved, but particles are large and polydisperse which reduces chromatography efficiency
Solution Approach 1:
The patent uses an inert porogen (diluent) as an intermediary substance during polymerization that creates pores in the final product. The porogen acts as a template that is removed after polymerization, leaving behind a porous structure. This mediator approach allows control over pore formation while achieving monodispersity through careful selection of polymerization conditions
Solution Approach 2:
The patent optimizes multiple parameters including crosslinker concentration (5-50%), porogen-to-monomer ratio, polymerization temperature, and initiator concentration to achieve both monodispersity and desired pore structure. By systematically adjusting these parameters, the invention resolves the contradiction between manufacturing ease and particle uniformity
2Manufacturing precision
If seeded emulsion polymerization is used to produce uniform macroporous microspheres, then particle uniformity is improved, but relatively high levels of crosslinker are required which increases manufacturing complexity
Solution Approach 1:
The patent systematically varies crosslinker concentration (testing ranges from 5-50%) and identifies optimal levels that achieve both particle uniformity and reduced crosslinker requirements. This parameter optimization resolves the contradiction by finding the minimum crosslinker level needed for uniform particle formation
Solution Approach 2:
The seeded emulsion polymerization method uses pre-formed seed particles as templates for subsequent polymerization. This preliminary action of creating uniform seeds ensures that final particles are monodisperse without requiring excessive crosslinker, as the seed structure guides uniform growth
3Measurement precision
If conventional multiplex assays are used, then detection capability is achieved, but detection time is extended and sensitivity is reduced
Solution Approach 1:
The patent employs macroporous microspheres with controlled pore sizes (20-200 nm) and high surface area (10-1000 m²/g) that enable simultaneous binding of multiple analytes. The porous structure provides increased binding capacity while maintaining rapid equilibrium, achieving both high sensitivity and fast detection in multiplex assays
Solution Approach 2:
The macroporous microspheres are functionalized with universal binding groups (carboxyl, amine, hydroxyl) that can simultaneously bind multiple different analytes. This multi-functional capability allows a single bead type to participate in multiplex detection of various targets, reducing overall detection time while maintaining sensitivity
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 approach enables simultaneous, multiple interrogations of specimens with increased sensitivity and detection efficiency in multiplex assays by creating uniquely distinguishable macroporous particles with enhanced surface area, suitable for use in flow cytometry and other analytical techniques.
Implementation Method 1
incorporate distinguishable fluorochromes or magnetic materials, enhancing surface area and signal detection in multiplex assays
Implementation Method 2
macroporous microspheres are microspheres with pore diameter sizes exceeding about 20 nm. The fact that these macroporous microspheres are porous yields the unique ability to form interactions on the interior 'pores' as well as the exterior surface
Implementation Method 3
incorporate distinguishable fluorochromes or magnetic materials
Data Source
AI summary
Macroporous beads and a method of manufacturing and using such macroporous beads. wherein the beads are distinguishable for use in a multiplex assay. Preferably, the beads are distinguishable by two or more unique fluorochromes, and at least some of the beads are magnetically responsive. In a preferred form, some of the macroporous beads have interior pores with a different moiety from the exterior surface, allowing beads with different attached functional groups.