Lateral Flow Device for Real-Time Liquid Analyte Detection
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Solution Overview
Problem
Conventional methods for detecting substances in liquids are often cumbersome, slow, and lack selectivity and sensitivity, particularly in real-time applications such as detecting drugs or allergens, and can be interfered with by beverage components like acidity or high ethanol concentrations.
Innovation Solution
A miniaturized lateral flow assay apparatus and method using a lateral flow device with a chromatographic membrane, buffer solutions, and anti-analyte antibodies or aptamers to provide rapid, selective, and sensitive detection of substances, including drugs and allergens, through a visual indication system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional testing methods are used, then detection capability is achieved, but the device is too cumbersome and takes too long to evaluate
Solution Approach 1:
The conventional testing system is segmented into a miniaturized lateral flow device that can be held in one hand, separating the detection function from the cumbersome laboratory equipment. The device includes discrete components (sample application area, test line, control line) that work together in a compact form factor.
Solution Approach 2:
The mechanical and chemical processes of conventional laboratory testing are replaced with a lateral flow mechanism driven by capillary action and immunological reactions. The test substance migrates through the membrane via capillary forces, eliminating the need for complex mechanical sample preparation and analysis equipment.
2Productivity
If conventional testing methods are used, then detection capability is achieved, but time to evaluate is too long
Solution Approach 1:
The antibodies and test substances are pre-immobilized on the lateral flow membrane in specific zones. When sample is applied, the detection reaction occurs immediately as the sample migrates through the pre-prepared test zones, eliminating the need for sequential preparation steps and reducing total detection time to under one minute.
Solution Approach 2:
The lateral flow mechanism rapidly transports the sample through the membrane and test zones using capillary action, accelerating the detection process. The sample quickly migrates from the application area through the test and control lines, providing results in under a minute compared to conventional methods.
3Measurement precision
If conventional testing methods are used, then detection capability is achieved, but selectivity and sensitivity to many compounds is insufficient
Solution Approach 1:
The lateral flow device uses universal detection principles (immunological binding, capillary flow) that can be applied to detect multiple different compounds by simply changing the immobilized antibody or aptamer. The same device structure and operating procedure can detect drugs, allergens, or other substances, providing versatile compound coverage.
Solution Approach 2:
The device achieves high selectivity through specific immunological parameters (antibody-antigen binding affinity, specificity) and physical parameters (capillary flow rate, line intensity). By changing the immobilized recognition element or detection label, the device can selectively detect different compounds with high precision.
4Reliability
If conventional testing methods are used, then detection capability is achieved, but beverage components interfere with testing
Solution Approach 1:
The lateral flow membrane and buffer solutions act as intermediaries that protect the detection system from beverage components. The membrane selectively allows passage of target analytes while retaining interfering substances, and the buffer maintains optimal pH and ionic conditions, neutralizing the harmful effects of beverage acidity and ethanol.
Solution Approach 2:
The device converts potential harmful effects into beneficial ones: the acidity and ethanol in beverages are used to drive rapid capillary flow through the membrane, actually accelerating the detection process. The buffer system converts acidic interference into a controlled pH environment that enhances antibody binding specificity.
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
Enables rapid, discreet, and accurate real-time detection of targeted substances in liquids, reducing sample volume and time to results, while overcoming interference from beverage components, with results displayed in under a minute.
Implementation Method 1
a liquid to be analyzed migrates along a fluid path from a sample area, across a conjugate area, across a chromatographic membrane
Implementation Method 2
The target substance or analyte, if present, reacts with an anti-analyte antibody and the reaction results in a visual indication of whether the target analyte is present in the liquid
Data Source
AI summary
Described herein are apparatus and methods for detecting substances of abuse or other analytes in liquids. For example, the apparatus and methods described herein can be used for real-time detection of analytes, such as substances of abuse. The methods comprise providing a detection area comprising a chromatographic membrane capable of receiving the liquid and allowing for migration of the liquid, the chromatographic membrane comprising an anti-analyte antibody-particle conjugate, an analyte-conjugate protein at a test line; exposing at least the first location of the apparatus to the liquid; and determining whether an interaction between the analyte-conjugate protein and the liquid occurs to detect the presence of the analyte. The chromatographic membrane may further comprise an anti-species antibody at a control line. Specific buffers are disclosed, and these buffers may be used in the preparation of the apparatus to overcome challenges associated with miniaturization and challenges associated with exposure to beverages.