Multiplex Microparticle Arrays Using Single Dye Intensity
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Solution Overview
Problem
Existing microparticle arrays for multiplex assays face limitations in sensitivity and dynamic range due to size-dependent capture reagent binding, and are difficult to manufacture and analyze, especially for simultaneous detection of multiple analytes using two-dimensional arrays based on fluorescence intensities of multiple dyes.
Innovation Solution
The creation of multidimensional arrays using singly dyed microparticles with overlapping emission spectra, allowing for detection in two channels and enabling the identification of multiple populations through distinct relative emission intensities, simplifies the manufacturing and analysis process while maintaining the advantages of multiply dyed arrays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two-dimensional arrays based on fluorescence intensities of multiple dyes are used for simultaneous detection of multiple analytes, then the number of detectable analytes increases, but the manufacturing complexity and analysis difficulty increase significantly
Solution Approach 1:
The invention extracts the distinguishing feature from multiple fluorescent dyes to a single fluorescent dye by using microparticles of different sizes. Instead of using multiple dyes to create distinguishable populations, the patent uses size variation of microparticles labeled with the same dye, thereby simplifying manufacturing and analysis while maintaining the ability to detect multiple analytes simultaneously
Solution Approach 2:
The invention changes the distinguishing parameter from fluorescent dye type to microparticle size. By varying the size parameter of microparticles while keeping the fluorescent label constant, the patent achieves population differentiation without the complexity of multiple dyes, resolving the contradiction between detection versatility and manufacturing complexity
2Adaptability or versatility
If microparticles of different sizes are used to distinguish multiple analytes, then multiple analytes can be detected simultaneously, but the sensitivity and dynamic range are limited due to size-dependent capture reagent binding
Solution Approach 1:
The invention applies local quality by coating all microparticles with the same capture reagent at optimized concentrations, ensuring uniform binding characteristics across different sized particles. This localized optimization of capture reagent coating compensates for size-dependent variations and maintains consistent sensitivity and dynamic range across the microparticle population
Solution Approach 2:
The invention transitions from using size as the distinguishing dimension to using fluorescent intensity as the distinguishing dimension. By exciting all microparticles with the same wavelength and detecting fluorescence intensity, the patent eliminates size-dependent binding issues while maintaining the ability to distinguish multiple analyte-bound populations based on their fluorescent signal strength
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 allows for the simultaneous detection of multiple analytes with improved sensitivity and dynamic range, simplifying the creation and analysis of multiplex assays, and enables the use of microparticles as solid substrates or labeling reagents in various applications, including flow cytometry and microscopy.
Implementation Method 1
Each microparticle population is labeled with a single fluorescent dye at a different concentration such that when the array is exposed to light, each microparticle population exhibits a distinct relative fluorescent intensity
Data Source
AI summary
Arrays of microparticle populations, each population labeled with a single fluorescent dye, are provided for use in multiplex assays. The populations form a virtual multidimensional array wherein each microparticle is identified by fluorescence intensity in two different fluorescence detection channels. The arrays are useful in a variety of assays, including multiplex, multi-analyte assays for the simultaneous detection of two or more analytes by, for example, flow cytometry, and a labeling reagents in, for example, microscopy. The use of singly-dyed microparticles to form multidimensional arrays greatly simplifies the creation of multiplex assays.