Urine-Based Plasmodium Antigen Detection via Lateral Flow
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Solution Overview
Problem
Current malaria diagnosis methods, particularly in resource-poor settings, face challenges due to the need for blood draws, which pose occupational hazards and are inadequate for resource-poor populations, necessitating a rapid and sensitive method for detecting Plasmodium analytes in body fluids other than blood.
Innovation Solution
A method and apparatus for detecting Plasmodium ligands, such as poly-asparagine proteins, HRP II, HRP III, and aldolase, in biological samples like urine using lateral flow devices, immunoassays, or mass spectrometry, allowing for the differentiation between symptomatic and asymptomatic infections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If blood film malaria diagnostic assay is used, then diagnostic accuracy is improved, but occupational hazards increase due to phlebotomy requirements
Solution Approach 1:
The patent extracts the diagnostic function from blood-based methods to urine-based methods. The assay device detects Plasmodium analytes (HRP-II, HRP-III, aldolase) in urine samples, eliminating the need for blood draws while maintaining diagnostic capability. This resolves the contradiction by removing the harmful phlebotomy step while preserving the diagnostic function.
Solution Approach 2:
The patent uses urine as an intermediary fluid to detect Plasmodium infection indirectly. Instead of directly analyzing blood for parasitemia, the assay detects parasite-derived antigens excreted in urine, providing a safe alternative that maintains diagnostic accuracy without occupational exposure risks.
2Ease of operation
If simple assays are used to improve availability, then ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The patent employs signal amplification strategies to enhance detection sensitivity. The assay uses enzyme-conjugated antibodies and chromogenic substrates to amplify the signal from trace amounts of Plasmodium antigens in urine, achieving high sensitivity despite the simplicity of the lateral flow format. This resolves the contradiction by improving detection limits without complicating the assay procedure.
Solution Approach 2:
The assay device integrates multiple functional components into a composite lateral flow strip: nitrocellulose membrane for separation, enzyme-conjugated antibodies for detection, chromogenic substrates for signal amplification, and control elements for quality assurance. This composite structure enables simple operation while maintaining high diagnostic precision.
3Object-affected harmful factors
If urine sampling is used instead of blood, then occupational hazards are reduced, but detection sensitivity may deteriorate due to lower analyte concentration
Solution Approach 1:
The patent incorporates sample preparation steps including filtration to remove debris, concentration to increase analyte density, and pH adjustment to optimize antigen-antibody binding. These preliminary actions on the urine sample ensure that even trace amounts of Plasmodium antigens are sufficiently concentrated and prepared for sensitive detection, resolving the contradiction between safety and sensitivity.
Solution Approach 2:
The patent replaces the mechanical/phlebotomy-based blood collection system with a chemical/biochemical detection system in urine. The lateral flow assay uses immunochromatographic principles and enzyme-linked detection to substitute direct parasitemia visualization with amplified antigen detection, achieving equivalent or superior sensitivity without blood draws.
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
This approach provides a safe, accurate, and highly sensitive method for malaria diagnosis in non-invasive samples like urine, improving treatment options and reducing occupational hazards, with the ability to detect low levels of Plasmodium analytes, enhancing diagnostic capabilities in resource-limited areas.
Implementation Method 1
a sample receiving membrane which conducts flow of a liquid sample
Implementation Method 2
detecting the presence or absence of one or more poly asparagine proteins or fragments thereof in a biological sample
Data Source
AI summary
This invention relates to assays for a Plasmodium analyte in a liquid sample such as a body fluid. More particularly, the invention relates to a method and apparatus for the detection of a ligand in a body fluid such as urine or blood, which can diagnose malarial infection.