Electrochemical AST ALT Detection Using Pyruvate Oxidase
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Solution Overview
Problem
Existing point-of-care tests for liver enzymes AST and ALT face challenges such as temperamental chromogens, instability, light sensitivity, and limited pH ranges, which affect sensitivity and precision, and require larger sample sizes and membrane reliance.
Innovation Solution
An electrochemical system that produces pyruvate from AST and ALT using pyruvate oxidase from E. Coli, eliminating the need for chromophores and incorporating a sampler with reactants and a heating element, and an electrochemical test strip with phosphate and ferricyanide, allowing for rapid and precise detection without additional reaction steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If chromogens are used in point-of-care tests for AST and ALT, then colorimetric detection can be achieved, but the tests suffer from temperamental chromogens, instability, light sensitivity, and limited pH ranges
Solution Approach 1:
The patent replaces the optical/colorimetric detection system with an electrochemical detection system. Instead of using chromogens that produce color changes, the invention uses electrochemical reactions where AST and ALT enzymes catalyze reactions that produce measurable electrical signals (current). This substitution eliminates the inherent problems of chromogens (instability, light sensitivity, pH limitations) while maintaining detection precision through electrochemical measurement of reaction products.
Solution Approach 2:
The patent changes the detection parameter from optical (colorimetric) to electrochemical. By measuring electrical current instead of color intensity, the system avoids the limitations of chromogens. The electrochemical detection method provides stable, reliable measurements across a broader pH range and without light sensitivity issues, while maintaining precision through quantitative electrical signal measurement.
2Ease of operation
If conventional point-of-care tests are used, then AST and ALT detection can be performed, but larger sample sizes are required
Solution Approach 1:
The patent employs pyruvate oxidase in the electrochemical reaction system to accelerate the oxidation of pyruvate produced by AST and ALT reactions. This enzymatic oxidation generates hydrogen peroxide, which is then detected electrochemically. The use of strong oxidants and efficient enzymatic reactions increases the sensitivity of detection, allowing for accurate measurement with smaller sample volumes compared to conventional colorimetric methods.
3Productivity
If conventional colorimetric methods are used, then AST and ALT can be detected, but additional reaction steps and membranes are required
Solution Approach 1:
The patent replaces the multi-step colorimetric reaction system with a streamlined electrochemical detection system. The electrochemical method integrates the detection process into fewer steps, eliminating the need for separate color development, incubation, and reading steps required by colorimetric methods. This substitution reduces device complexity and increases testing speed by combining reaction and detection in a more efficient manner.
Solution Approach 2:
The patent extracts and eliminates unnecessary components from the conventional testing system, specifically removing the need for membranes and additional reaction steps. By using electrochemical detection directly on the test strip without requiring membrane-based separation or multiple reagent additions, the system simplifies the overall process while maintaining detection accuracy and improving throughput.
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 system provides a cost-effective, precise, and sensitive method for detecting AST and ALT, reducing sample size and eliminating membrane reliance, with improved precision and speed, suitable for point-of-care testing and potential use in monitoring liver health and medication effects.
Implementation Method 1
the electrochemical test strip includes phosphate and ferricyanide. Optionally, the electrochemical test strip further includes pyruvate oxidase
Implementation Method 2
a meter for reading the electrochemical test strip and indicating an amount of AST in the sample
Implementation Method 3
In one configuration, the sampler includes a heating element. In another alternative, the sampler includes a timer
Implementation Method 4
the electrochemical test strip includes phosphate and ferricyanide
Data Source
AI summary
A system for electrochemically detecting AST and ALT includes a first sampler for producing pyruvate from ALT and a second sampler for producing pyruvate from AST. The system further includes an electrochemical test strip for receiving processed samples from the first and second samplers, the processed samples containing pyruvate. The system further includes a meter for reading the electrochemical test strip and indicating an amount of AST and ALT in the sample.