Electrochemical Analyte Sensing With Inorganic Catalysts and pH Control
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Solution Overview
Problem
Conventional enzymatic electrochemical sensors exhibit low stability over environmental conditions and limited sensitivity in quantifying low-abundance molecules, particularly in samples like human saliva where glucose concentration is significantly lower than in blood, making non-invasive diabetic management challenging.
Innovation Solution
The use of inorganic catalysts, such as copper oxide, in electrochemical sensors, combined with a pH control system to manage local acidity/basicity, enhances stability and sensitivity for quantifying analytes like glucose in liquid samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If enzymatic catalysts are used in electrochemical sensors, then the sensors can quantify analytes in liquid samples, but the sensors exhibit low stability over environmental conditions and limited sensitivity in low-abundance molecule quantification
Solution Approach 1:
The patent changes the fundamental parameter of the catalyst material from organic enzymatic catalysts to inorganic catalysts (such as copper oxide, cobalt oxide, nickel oxide, iron oxide, or zinc oxide). This material parameter change enables the sensor to achieve both high stability under varying environmental conditions and high sensitivity for detecting low-concentration analytes like glucose in saliva, resolving the contradiction between reliability and measurement precision.
2Measurement precision
If conventional enzymatic electrochemical sensors are used, then they can measure analytes in blood, but they cannot accurately quantify low concentration analytes in saliva
Solution Approach 1:
The patent applies parameter changes by substituting the catalyst material from enzyme-based to inorganic metal oxides. This change enables the sensor to detect and accurately quantify low-concentration analytes in saliva (non-invasive sampling) while maintaining quantification accuracy, thereby resolving the contradiction between measurement precision and reliability for low-abundance molecules.
3Reliability
If inorganic catalysts are used to improve stability and sensitivity, then low-concentration analyte quantification becomes possible, but pH control becomes critical for catalyst performance
Solution Approach 1:
The patent applies local quality by implementing a pH control system that specifically manages the pH environment around the inorganic catalyst electrode. This localized pH control ensures optimal catalyst performance and stable analyte quantification, addressing the increased device complexity requirement while maintaining the benefits of inorganic catalysts for reliable and sensitive detection.
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
Inorganic catalysts provide higher stability and sensitivity for low-concentration analyte quantification, enabling accurate glucose measurement in saliva with improved reliability and stability, even with varying pH levels.
Implementation Method 1
one of the plurality of electrodes is provided with and functionalised by an inorganic catalyst, which reacts with the analyte in the liquid sample to enable a concentration or amount of the analyte to be determined
Implementation Method 2
electrochemical sensing device for quantifying an analyte in a liquid sample
Implementation Method 3
The liquid sample is then carried along the hydrophilic channel towards the plurality of electrodes
Data Source
AI summary
An electrochemical sensing device for quantifying an analyte in a liquid sample includes a substrate, a plurality of electrodes disposed on the substrate, one of the plurality of electrodes being functionalised with a catalyst, the catalyst comprising an inorganic compound, and a hydrophilic channel disposed on the substrate configured to receive the liquid sample and direct the liquid sample to the electrodes.