Permselective Membrane Electrochemical Test Strip for Paracetamol Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for detecting paracetamol poisoning, such as spectrophotometric and competitive lateral flow immunoassays, are not suitable for point-of-care testing due to complexity, high cost, and interference issues, leading to inaccurate results and a need for a mobile, simple, and quantitative assay.
Innovation Solution
A disposable multilayer test strip with a carbon-based electrode assembly, including a pseudoreference electrode and permselective membrane, that allows for the detection of neutral analytes like paracetamol in a sample, using a voltage-controlled electrochemical method, enabling quick and accurate measurements with minimal sample treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If spectrophotometric methods are used for paracetamol detection, then the method is simple and low cost, but it is confined to specialized laboratories and suffers from interference causing inaccurate results
Solution Approach 1:
The patent introduces a permselective membrane as an intermediary layer between the sample and the electrochemical sensor. This membrane selectively allows neutral molecules like paracetamol to pass through while blocking interfering substances, thus improving measurement accuracy without compromising the simplicity of the test strip operation
Solution Approach 2:
The patent replaces the optical detection system (spectrophotometry) with an electrochemical detection system. This substitution enables the development of a portable test strip that eliminates interference issues while maintaining operational simplicity and reducing the need for specialized laboratory equipment
2Ease of operation
If competitive lateral flow immunoassays are used for paracetamol detection, then qualitative determination is possible, but the tests are not quantitative and show false negatives due to high cut-off concentrations
Solution Approach 1:
The patent replaces the immunoassay-based optical detection system with an electrochemical detection system. This substitution enables quantitative measurement of paracetamol at low concentrations by measuring current proportional to analyte concentration, eliminating the false negative problem while maintaining the simplicity of a point-of-care test strip
Solution Approach 2:
The patent changes the detection parameter from optical signal (in immunoassays) to electrochemical current. This parameter change enables quantitative detection across a wider concentration range, including low concentrations that were previously undetectable by lateral flow immunoassays with high cut-off concentrations
3Adaptability or versatility
If a point-of-care assay for paracetamol detection is developed, then mobility and simplicity are improved, but detection sensitivity and quantitative accuracy must be maintained
Solution Approach 1:
The patent merges multiple functions into a single integrated test strip: the permselective membrane provides both sample preparation (blocking interferents) and selective transport (allowing neutral analytes through), while the electrochemical sensor provides both detection and quantitative measurement. This integration maintains high detection sensitivity in a portable format suitable for point-of-care use
Solution Approach 2:
The patent uses composite materials including the permselective membrane (made from materials like Nafion or carboxymethyl cellulose) combined with electrochemical sensing elements. This composite structure provides both the selectivity needed for sensitive detection and the portability required for point-of-care applications
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 provides rapid, quantitative, and selective detection of paracetamol with low detection limits and wide linear range, achieving results in under 5 minutes using a small sample volume, even in the presence of interferents, and is suitable for point-of-care use.
Implementation Method 1
The permselective membrane has a structure adapted to allow passage of one or more electronically neutral analytes in a sample to be analysed across the permselective membrane to the electrode assembly
Implementation Method 2
a carbon-based working electrode, a carbon-based counter electrode and a pseudoreference electrode... measuring a current between the working electrode and counter electrode
Data Source
AI summary
According to an example aspect of the present invention, there is provided a disposable multilayer test strip comprising a substrate onto which is deposited an electrode assembly comprising a carbon-based working electrode, a carbon-based counter electrode, a pseudoreference electrode, wherein the pseudo reference electrode, the working electrode and the counter electrode, are arranged adjacent to each other in the same plane, contacts for contacting the electrodes directly to a voltage supply, and the test strip further comprises a permselective membrane layer. The electrodes of the electrode assembly layer are electrically separated from one another and said electrode assembly layer is positioned between the substrate and the permselective membrane layer. The permselective membrane has a structure adapted to allow passage of one or more electronically neutral analytes in a sample to be analysed across the permselective membrane to the electrode assembly.