Lateral Flow Antibiotic Detection with Methylcellulose Sensitivity
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Solution Overview
Problem
Current methods for detecting antibiotics in samples, such as microbial inhibition tests and competitive immunoassays, are either time-consuming or require extensive user handling and lack sufficient sensitivity.
Innovation Solution
A lateral flow test device with specific regions for sample reception, conjugate interaction, detection, and control, utilizing labeled receptors and control reagents, and incorporating compounds like methylcellulose to enhance sensitivity, allowing for rapid and user-friendly detection of antibiotics by comparing signal intensities between detection and control zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If microbial inhibition tests are used to detect antibiotics, then detection can be performed, but it takes a relatively long time to obtain results
Solution Approach 1:
The patent replaces the biological growth observation system (microbial inhibition tests requiring incubation and visual assessment of growth zones) with a lateral flow immunoassay system that uses antibody-antigen binding and visual signal detection. This substitution eliminates the time-consuming microbial culture process while maintaining detection capability through specific antibody binding to antibiotic analytes.
Solution Approach 2:
The patent changes the detection parameter from measuring microbial growth inhibition (which requires extended incubation time) to measuring the presence/absence of antibody-analyte complexes through visual signal intensity. This parameter change enables rapid detection within minutes rather than hours or days.
2Loss of time
If competitive immunoassays are used to detect antibiotics, then detection speed improves, but extensive user handling is required making them not user friendly
Solution Approach 1:
The patent merges the conjugate preparation, sample mixing, and detection steps into a single integrated lateral flow strip device. The pre-coated strip contains all necessary reagents (antibodies, control reagents, labels) that automatically mix with the sample during capillary flow, eliminating the need for separate preparation steps and extensive user handling.
Solution Approach 2:
The lateral flow strip performs self-mixing and self-detection through capillary action. The sample automatically flows through the conjugate region and detection region, and the result is visually displayed on the strip itself without requiring external equipment or complex user operations. Users simply apply the sample and read the result.
3Loss of time
If competitive immunoassays are used to detect antibiotics, then detection speed improves, but sensitivity is not sufficient
Solution Approach 1:
The patent applies different compounds (methylcellulose, carboxymethylcellulose, hydroxymethylcellulose, carboxyethylcellulose, or hydroxyethylcellulose) to specific regions of the lateral flow strip (between the proximal end and detection region) to optimize local conditions for enhanced sensitivity. This localized modification improves antibody-antigen binding efficiency and signal intensity at critical detection zones without affecting the overall assay speed.
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 method provides a fast, user-friendly, and sensitive means to detect antibiotics, improving upon existing techniques by enabling quick identification of antibiotic presence with clear signal differentiation, enhancing sensitivity through the use of methylcellulose in the test device.
Implementation Method 1
a conjugate region comprising a labeled receptor capable to bind the analyte and a labeled control reagent, a detection region comprising at least two zones: A. a detection zone comprising an immobilized binding agent capable of binding the labeled receptor, when said labeled receptor is unbound by analyte from the sample
Implementation Method 2
a test device having a proximal and a distal end, said test device configured to allow lateral flow from the proximal to the distal end
Data Source
AI summary
The present invention relates to a competitive assay device and method for 5 detecting analytes in a sample. The competitive assay device comprises a sample receiving region, a conjugate region, a detection region, an absorbing region, and optionally a handling region, and comprises, between its proximal end and the detection region, a compound selected from the list consisting of methylcellulose, carboxymethylcellulose, hydroxymethylcellulose, carboxyethylcellulose, and 10 hydroxyethylcellulose. The test is suitable for the detection of antibiotics such as beta- lactams and has superior sensitivity.