Stimulus-Responsive Gel for Enzyme-Free Lactic Acid Detection
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Solution Overview
Problem
Existing non-invasive biochemical sensors for detecting components like lactic acid in sweat require complex structures, are heavy, and rely on expensive enzymes that are unstable and sensitive to temperature and humidity, limiting their reliability and quantitative performance.
Innovation Solution
A stimulus-responsive gel material composed of a first polymer with an OH group, a second polymer with a phenylboronic acid structure, fine particles, and a solvent, which changes state in response to stimuli, allowing for stable and sensitive detection of lactic acid concentrations without the need for enzymes or complex structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an electrode method using a dye or an enzyme is used for non-invasive detection, then detection capability is achieved, but the structure becomes complicated and weight increases due to needing processing sections, display sections, and power sources
Solution Approach 1:
The patent extracts and eliminates the complex electronic components (electrode, processing section, display section, power source) from the detection system. Instead, it uses a simple gel material that directly exhibits color changes in response to analyte concentration, thereby achieving detection capability without the complicated structure and weight of electronic components.
Solution Approach 2:
The patent replaces the mechanical/electronic detection system (electrode method requiring power sources and processing sections) with a chemical/optical system based on gel materials that undergo direct color changes. This substitution eliminates the need for complex electronic components while maintaining detection functionality.
2Measurement precision
If an enzyme is used for detection, then detection capability is achieved, but reliability decreases because the enzyme is expensive, susceptible to temperature and humidity, and exhibits unstable properties
Solution Approach 1:
The patent replaces expensive enzymes with inexpensive gel materials that do not degrade over time or under environmental conditions. The gel material provides a stable, cost-effective alternative that eliminates the reliability issues associated with enzyme susceptibility to temperature, humidity, and batch variations.
Solution Approach 2:
The patent changes the detection mechanism from enzyme-based biochemical reactions to gel material-based color changes. This parameter change in the detection principle eliminates the instability inherent in enzyme systems, as the gel materials maintain consistent properties across batches and over time without being affected by environmental conditions.
3Measurement precision
If an enzyme is used for detection, then detection capability is achieved, but manufacturing precision decreases due to great variation in quality among production lots and depending on manufacturers
Solution Approach 1:
The patent uses gel materials that exhibit homogeneous and consistent properties across different production batches and manufacturers. Unlike enzymes, which show great quality variation, the gel materials provide uniform detection performance, eliminating the need for calibration and ensuring consistent manufacturing quality.
4Measurement precision
If an enzyme is used for detection, then detection capability is achieved, but loss of time increases due to the need to perform calibration using a standard solution having a known concentration before use
Solution Approach 1:
The gel material performs self-detection without requiring external calibration. The color change directly reflects the analyte concentration, eliminating the need for time-consuming calibration procedures with standard solutions. The system is ready for immediate use upon preparation.
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 gel material provides high sensitivity and stability in detecting lactic acid over a wide range, eliminating the need for enzymes and reducing complexity, while maintaining a favorable gel state for prolonged periods.
Implementation Method 1
a first state in which the OH group of the first polymer and the phenylboronic acid structure of the second polymer are bonded to each other; and a second state in which the bond between the OH group of the first polymer and the phenylboronic acid structure of the second polymer is dissociated
Data Source
AI summary
A stimulus-responsive gel material includes: a first polymer having an OH group; a second polymer having a phenylboronic acid structure; fine particles having an average particle diameter of 10 nm or more and 1000 nm or less; and a solvent, wherein the material is capable of being put into a first state in which the OH group of the first polymer and the phenylboronic acid structure of the second polymer are bonded to each other, and a second state in which the bond between the OH group of the first polymer and the phenylboronic acid structure of the second polymer is dissociated, and the wavelength of a reflected light from the material is different between the first state and the second state.