Vitrified Lateral Flow Assay for Cold-Chain-Free Rapid Detection
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Solution Overview
Problem
Standard serological diagnostic methods for detecting antibodies or pathogens in biological samples require cold-chain shipping and storage, specialized equipment, and skilled labor, leading to lengthy delays and potential sample degradation, which can result in false positives or negatives, especially during pandemic events.
Innovation Solution
The development of a vitrified matrix-based diagnostic device that includes capture agents and reporter molecules, which can be stored at elevated temperatures for weeks or months without losing activity, allowing for rapid, point-of-care detection of target analytes using a lateral flow immunoassay without complex instrumentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If standard serological diagnostic methods (ELISA, PCR, bead-based profiling) are used, then detection accuracy is maintained, but test duration extends to 3 hours or more and requires cold-chain storage
Solution Approach 1:
The patent changes the physical-chemical parameters of the assay reagents by vitrifying capture agents and reporter molecules in a glassy matrix state. This allows the reagents to be stored at room temperature without cold-chain while maintaining stability. Upon sample contact, the matrix rehydrates and the vitrified reagents become active, enabling rapid detection within 20 minutes while preserving accuracy through the stable glassy state storage that prevents degradation and contamination.
2Measurement precision
If complex laboratory procedures with specialized equipment are used, then detection precision is improved, but device complexity and operational difficulty increase
Solution Approach 1:
The patent extracts the detection function from complex laboratory equipment and consolidates it into a simple lateral flow membrane device. The vitrified capture agents and reporter molecules are directly incorporated into the membrane matrix, eliminating the need for separate reagent storage systems, incubators, washers, and detectors. The assay can be read visually or with simple colorimetric detection, removing the need for complex instrumentation while maintaining detection precision through the stable glassy state reagents.
Solution Approach 2:
The device performs self-service by using the sample fluid itself to rehydrate and activate the vitrified reagents in the membrane. The lateral flow mechanism automatically transports the sample through the assay zones, and the visual color change provides self-indication of results. This eliminates the need for skilled operators to perform complex procedures with specialized equipment.
3Stability of the object's composition
If cold-chain storage is used, then reagent stability is maintained, but storage cost and logistical complexity increase
Solution Approach 1:
The patent utilizes the phase transition between glassy (vitrified) and hydrated states of the reagent matrix. In the glassy state, capture agents and reporter molecules are locked in a stable, low-mobility configuration that prevents degradation and allows room-temperature storage. Upon contact with sample fluid, the matrix transitions to a hydrated state, reactivating the reagents for detection. This phase transition mechanism eliminates the need for cold-chain storage while maintaining reagent stability during transport and storage.
4Productivity
If rapid detection methods are developed, then test time is reduced, but reliability and accuracy may be compromised
Solution Approach 1:
The patent applies preliminary action by pre-vitrifying the capture agents and reporter molecules in the membrane matrix before use. This pre-preparation in the stable glassy state ensures that when the sample is applied, the reagents are immediately available in optimal configuration for rapid binding and detection. The vitrification process preserves the spatial arrangement and binding capacity of the reagents, enabling fast 20-minute detection without compromising accuracy that would normally require lengthy incubation and washing steps.
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 device provides rapid, robust, and quantitative detection of target analytes in 20 minutes or less, eliminating the need for cold-chain storage and enabling immediate results at the point-of-care.
Implementation Method 1
a membrane that includes a vitrified matrix comprising capture agents that may or may not be optionally covalently bound to the matrix and that may or may not themselves include a detectable label
Data Source
AI summary
Provided herein is a rapid lateral flow device for detection of a target analyte in a liquid biological sample comprising a membrane strip, the membrane strip including: a matrix; a conjugate pad having at least one reporter vitrified into the matrix; one or more test sites including a covalently or electrostatically bound capture agent vitrified into or onto the matrix; and, optionally, a control line including one or more capture agents vitrified into or onto the matrix. Also provided are methods of rapid detection of a target analyte in a liquid biological sample.