Lateral Flow Immunoassay Fluorescence Detection
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Solution Overview
Problem
Lateral flow immunoassays face challenges in sensitivity, particularly in detecting weak positives and differentiating between viral and bacterial infections, leading to potential false positives and misdiagnosis.
Innovation Solution
Incorporating a small quantity of fluorescing elements, such as dyes or latex bead conjugates, into the conjugate material to enhance sensitivity and using combined visual/fluorescence detection, allowing for UV light excitation to confirm test results, and employing specific markers for viral and bacterial infections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If lateral flow immunoassay uses only visual detection, then the test is simple and rapid, but the sensitivity is insufficient leading to false positives and inability to detect weak positives
Solution Approach 1:
The patent combines visual detection and fluorescence detection into a single lateral flow immunoassay test strip. The conjugate material contains both visually detectable particles (colloidal gold) and fluorescing elements (fluorescein isothiocyanate-conjugated latex beads), allowing the same test to provide both visual and fluorescence readouts without requiring separate tests.
Solution Approach 2:
The patent introduces fluorescing elements as an intermediary that enhances the detection capability. These fluorescent markers serve as a mediator between the antigen-antibody binding event and the final detection, providing amplified signal that can be detected by UV light to confirm weak positives and reduce false readings.
2Measurement precision
If lateral flow immunoassay uses only visual detection, then the operation is simple, but the ability to differentiate viral and bacterial infections is limited
Solution Approach 1:
The patent applies different detection modalities to different test lines on the same strip. The first test line uses visually detectable colloidal gold for general detection, while the second test line uses fluorescing latex beads for enhanced differentiation. This local differentiation of detection quality allows simultaneous simple operation and accurate infection type differentiation.
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 solution increases test sensitivity tenfold, enables rapid differentiation of viral and bacterial infections, and reduces false readings, providing accurate results within minutes, thus improving diagnostic accuracy and reducing healthcare costs.
Implementation Method 1
a light of an appropriate spectrum, such as a UV spectrum, is cast on the test line to correctly interpret the test results. If the test is positive, the UV light will excite and fluoresce the fluorescing dye or the fluorescing latex beads which are bound in the test line to enhance the visible color at the test line
Data Source
AI summary
The sensitivity of visually read lateral flow immunoassay tests is enhanced by adding a small quantity of fluorescing dye or fluorescing latex bead conjugates to the initial conjugate material. When the visible spectrum test line is visibly present, the test result is observed and recorded. However, in the case where the result is indeterminate, a light of an appropriate spectrum, such as a UV, visible, or infrared spectrum, is cast on the test line to excite and fluoresce the fluorescing latex beads which are bound in the test line in true positive tests to enhance the visible color at the test line.