Colloidal Gold Antigen Assay for Mycobacterial Biomarker Detection
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Solution Overview
Problem
Current methods for detecting mycobacterial diseases, such as tuberculosis, are time-consuming, expensive, and unreliable, especially in areas with co-infection with HIV, where protein antibody detection is suppressed, leading to missed diagnoses and urgent need for quick and reliable detection.
Innovation Solution
A method involving linking an antigen to colloidal gold and using it to detect biomarkers, specifically lipid antibodies, which are not suppressed in HIV-positive individuals, by observing color changes in a sample after adding a diagnosis agent, allowing for rapid identification of mycobacterial infections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing diagnostic methods are used, then detection can be performed, but the results take a long time to be known and are not always reliable
Solution Approach 1:
The patent replaces complex mechanical and biochemical diagnostic systems with a simple colorimetric detection system using gold nanoparticles. The gold-antigen conjugates provide visual color changes that can be observed directly without expensive equipment, eliminating the need for complex incubation and reading procedures while delivering rapid results within minutes.
Solution Approach 2:
The patent changes the detection parameter from requiring complex biochemical reactions to observing color changes of gold nanoparticles. By utilizing the inherent color properties of gold particles and their aggregation behavior, the system transforms a complex diagnostic process into a simple visual observation that maintains reliability while dramatically reducing time requirements.
2Ease of operation
If existing diagnostic methods are used, then detection can be performed, but the equipment needed is expensive or difficult to use
Solution Approach 1:
The patent replaces expensive, complex diagnostic equipment with a simple visual observation system. Gold nanoparticle-based assays can be performed with basic laboratory equipment or even in field conditions, requiring only mixing and visual inspection, thereby dramatically simplifying the operational complexity while maintaining diagnostic capability.
Solution Approach 2:
The patent employs disposable gold-antigen conjugate reagents that can be prepared or purchased as ready-to-use solutions. These single-use reagent systems eliminate the need for expensive, maintainable equipment, making the diagnostic process accessible in resource-limited settings while maintaining ease of operation.
3Reliability
If protein antibody detection is used in HIV co-infection, then standard diagnostic protocols can be followed, but the detection is suppressed leading to missed diagnoses
Solution Approach 1:
The patent changes the detection target from protein antibodies to lipid antibodies, which are not suppressed in HIV co-infection. By utilizing lipid-based antigens conjugated to gold particles, the system detects a different immunological marker that remains functional in immunocompromised patients, thereby maintaining detection accuracy while adapting to the specific physiological conditions of HIV co-infection.
Solution Approach 2:
The patent introduces gold nanoparticles as an intermediary that enables detection of lipid antibodies through a different mechanism than traditional protein-based assays. The gold-lipid antigen conjugates interact with lipid antibodies in a way that is not affected by HIV-mediated suppression, serving as a mediator that bypasses the immunosuppression barrier.
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 method provides a quick, reliable, and cost-effective means to detect mycobacterial infections by identifying lipid antibodies indicative of mycobacterial exposure, improving diagnostic accuracy and speed, especially in HIV co-infection scenarios.
Implementation Method 1
linking an antigen to colloidal gold to provide a gold-antigen species... observing the colour of the sample
Data Source
AI summary
A method of determining the presence or absence in a sample of a biomarker, the method comprising: (a) linking an antigen to colloidal gold to provide a gold-antigen species; (b) contacting the gold-antigen species with the sample; (c) adding a diagnosis agent to the sample; and (d) observing the color of the sample.