Capillary Immunoassay Imaging for Wash-Free Multiplex Detection
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Solution Overview
Problem
Current POC tests for infectious diseases often require complex sample preparation and expensive instrumentation, limiting their applicability in resource-limited settings, and multiplexed tests lack evidence of real-world performance for rapid detection of multiple diseases from a single sample.
Innovation Solution
A novel multiplexed microparticle immunoassay method using a capillary channel with analyte-specific capture domains and digital imaging, eliminating the need for a washing step by measuring bound fluorescence labels directly, allowing for rapid detection of multiple analytes from a single sample without bulk separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional flow cytometry-based assays are used for high accuracy and multiplexing, then measurement precision and adaptability are improved, but device complexity and ease of operation deteriorate
Solution Approach 1:
The patent replaces complex flow cytometry instrumentation with a simple capillary channel device. The mechanical complexity of flow cytometers is substituted by using capillary action for fluid transport and digital imaging for detection, maintaining measurement precision while dramatically simplifying the device.
Solution Approach 2:
The patent uses digital imaging to capture and analyze bead positions and fluorescence signals, creating a digital copy of the physical assay state. This allows complex multiplexed measurements to be performed and analyzed through software rather than requiring complex hardware differentiation.
2Adaptability or versatility
If traditional flow cytometry-based assays are used for high accuracy and multiplexing, then adaptability is improved, but ease of operation deteriorates
Solution Approach 1:
The patent creates a universal platform where a single capillary channel device can detect multiple analytes simultaneously using fluorescently labeled beads with different emission wavelengths. The same basic device structure handles diverse infectious disease markers, making it both adaptable and easy to use.
Solution Approach 2:
The patent introduces fluorescently labeled beads as intermediaries that mediate between the sample analytes and the detection system. These beads carry specific binding members for different analytes and provide distinguishable fluorescence signals, enabling multiplexing without increasing operational complexity.
3Measurement precision
If washing steps are included to remove sample components, then measurement precision is improved, but productivity and duration of action deteriorate
Solution Approach 1:
The patent extracts and removes the washing step from the traditional immunoassay protocol. By using fluorescently labeled beads with specific binding members that capture target analytes directly, the method eliminates the need for washing away unbound components, thereby maintaining precision while dramatically speeding up the assay.
Solution Approach 2:
The patent skips the traditional washing step entirely, rushing through the detection process by directly imaging the fluorescent signals from bead-analyte complexes. This skipping of the washing step maintains measurement precision while reducing the assay duration from hours to minutes.
4Adaptability or versatility
If multiple analytes are detected from a single sample, then adaptability is improved, but device complexity deteriorates
Solution Approach 1:
The patent adds the dimension of fluorescence wavelength differentiation to the detection system. By using beads with different fluorescent labels that emit at distinct wavelengths, the system can detect multiple analytes simultaneously in a single capillary channel without increasing structural complexity, effectively using spectral dimensionality to achieve multiplexing.
Data Source
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AI summary
The present disclosure provides methods for the detection of one or more analytes in a sample. Aspects of the methods include flowing a sample (e.g., a biological sample, such as blood) through a channel comprising an analyte specific capture domain stably associated with a surface thereof, wherein the analyte specific capture domain comprises particles displaying a specific binding member for an analyte; and imaging the analyte specific capture domain to detect whether the analyte is present in the sample. Also provided are systems, devices, and kits that may be used in practicing the subject methods. Methods and compositions as described herein find use in a variety of different applications, including diagnostic applications.