Elongated Hydrogel Microparticle Multiplexing via Length and Dye Intensity
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Solution Overview
Problem
Current multiplexing methods for hydrogel microparticles are complex and do not efficiently utilize the length parameter, limiting their multiplexing capabilities and requiring sophisticated imaging and decoding algorithms.
Innovation Solution
Incorporating a length scale and varying fluorescent dye concentrations into elongated hydrogel microparticles, allowing for simple and effective multiplexing by measuring length and burst intensity using flow cytometry or laser-induced fluorescence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional bead-based multiplexing using fluorescent beads with varying dye amounts is used, then multiplexing capability is achieved, but the method lacks utilization of the length parameter and requires complex imaging and decoding algorithms
Solution Approach 1:
The patent introduces length as an additional dimension for multiplexing coding. By varying the length of fluorescent elements within microparticles, the system adds a new parameter (length) to the traditional dye-intensity-based coding approach. This dimensional addition enables more combinations without increasing algorithmic complexity, as length can be directly measured by flow cytometry rather than requiring sophisticated image analysis.
Solution Approach 2:
The patent replaces complex imaging and decoding algorithms with flow cytometry-based length measurement. Instead of using microscopy and image processing to decode particle identities, the system uses flow cytometry to measure the length of fluorescent elements, which simplifies the detection mechanism and reduces computational requirements while maintaining high multiplexing capability.
2Adaptability or versatility
If quantum dots with sharp spectral emission profiles are mixed in microparticles for multiplexing, then significant multiplexing levels are achieved, but the method requires sophisticated imaging and decoding algorithms
Solution Approach 1:
The patent changes the parameter used for coding from spectral emission ratios (requiring complex spectroscopic analysis) to physical length measurements. By encoding information in the length of fluorescent elements rather than in spectral ratios, the system simplifies detection to straightforward length measurements obtainable by flow cytometry, reducing the difficulty of detection and measurement while maintaining high multiplexing levels.
Solution Approach 2:
The patent substitutes complex spectral analysis systems with simpler length measurement systems. Instead of requiring sophisticated imaging systems capable of resolving and ratioing spectral emissions, the system uses flow cytometry to measure the length of fluorescent elements, which is a more straightforward and less complex measurement process.
3Loss of information
If barcodes (1D or 2D) are added to microparticles for unique identification, then unique intensity versus time profile signatures are achieved, but sophisticated imaging and decoding algorithms are required
Solution Approach 1:
The patent extracts the coding function from complex visual barcodes and transfers it to simple length variations of fluorescent elements. Instead of using 1D or 2D barcode patterns that require imaging and decoding, the system uses the length of fluorescent elements as the coding parameter, which can be directly measured by flow cytometry without requiring image capture or decoding algorithms.
Solution Approach 2:
The patent replaces the imaging-based barcode detection system with a flow cytometry-based length measurement system. This substitution eliminates the need for sophisticated imaging and decoding algorithms while preserving the ability to uniquely identify particles through their coded characteristics.
4Object-generated harmful factors
If PEG microparticles are used instead of conventional polymeric particles, then low autofluorescence and low non-specific binding are achieved, but the fabrication process requires UV curing of acrylate functionalized PEG
Solution Approach 1:
The patent changes the chemical composition parameter of the microparticles by using PEG-based materials with acrylate functional groups instead of conventional polymeric particles. This compositional change provides beneficial properties (low autofluorescence and low non-specific binding) while enabling UV curing fabrication. The parameter change in material composition simultaneously addresses both the harmful factors reduction and enables a specific fabrication approach.
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 achieves high levels of multiplexing with fewer detectors needed, increasing practicality and simplicity by leveraging length and dye intensity measurements, enabling up to 250 combinations and reducing the complexity of image analysis.
Implementation Method 1
a microparticle coded by a fluorescent dye concentration... measuring length and burst intensity using flow cytometry or laser-induced fluorescence
Implementation Method 2
PEG-monoacrylate (PEGMA) and PEG-diacrylate (PEGDA) are common forms of UV curable PEG. This involves the use of a photoinitiator with an acrylate functionalized PEG mixture. Exposure to UV leads to the initiation of the reaction and thus the formation of the particles.
Data Source
AI summary
Multiplexing microparticles by measurement of particle length and dye. Utilization of length-based measurements in combination with dye concentrations to attain multiplexing for bioassays.