Saliva Glucose Sensor with Carbon Nanotube Functionalization
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Solution Overview
Problem
Current methods for glucose monitoring in diabetes management, such as finger pricking, are invasive, painful, and inconvenient, leading to inadequate blood glucose control and increased complications, while noninvasive methods like saliva glucose monitoring lack sensitive and cost-effective sensors for home use.
Innovation Solution
A highly sensitive electrochemical glucose sensor for saliva samples using a substrate with working, counter, and reference electrodes, functionalized with glucose oxidase and nanomaterials like single-walled carbon nanotubes, capable of detecting glucose concentrations down to 5 ppm in seconds, suitable for both reusable and disposable forms, and integrated into a fluidic system for real-time monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If finger pricking blood glucose monitoring is used, then accurate blood glucose control is achieved, but pain and inconvenience increase leading to inadequate control
Solution Approach 1:
The patent uses saliva as an intermediary medium to indirectly monitor glucose levels. Instead of directly measuring blood glucose through painful finger pricks, the system measures glucose in saliva which correlates with blood glucose levels, thereby eliminating pain while maintaining monitoring reliability
Solution Approach 2:
The patent replaces the mechanical finger pricking system with an electrochemical sensing system. The electrochemical glucose sensor detects glucose in saliva through electrical signals, substituting the mechanical trauma of finger pricks with a painless electrochemical measurement process
2Object-affected harmful factors
If noninvasive saliva glucose monitoring is used, then pain is eliminated, but sensor sensitivity and accuracy are insufficient for home use
Solution Approach 1:
The patent enhances sensor sensitivity by changing the detection parameter from conventional optical methods to electrochemical measurement. The electrochemical sensor can detect glucose at concentrations as low as 5 ppm in saliva, providing the necessary sensitivity and accuracy for home monitoring while maintaining noninvasive operation
Solution Approach 2:
The patent employs composite material structures in the sensor design, combining electrode materials with glucose oxidase enzyme and nanomaterials to create a highly sensitive detection system. This composite approach enables accurate glucose detection in saliva at home-use concentrations
3Measurement precision
If existing electrochemical sensors are used, then glucose detection sensitivity is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts and isolates the essential sensing function from complex laboratory equipment. By using a simplified electrochemical sensor that can be integrated into portable devices, the system achieves high sensitivity glucose detection while removing unnecessary complexity associated with laboratory instruments
Solution Approach 2:
The patent designs a disposable sensor strip that can be easily discarded after use, eliminating the need for expensive, complex reusable sensor systems. The disposable nature of the sensor reduces overall system cost and complexity while maintaining high detection sensitivity for home monitoring applications
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
Provides noninvasive, painless, and convenient glucose monitoring with rapid results, suitable for home use, offering accurate tracking of glucose levels comparable to blood glucose monitoring, reducing complications and improving diabetes management.
Implementation Method 1
The sensor includes an insulating or semiconducting substrate, at least one working electrode, a counter electrode, and a reference electrode... The working electrode is optionally coated in the sample placement area with a plurality of sensor elements. The sensor elements (or the working electrode in the sample placement area, if no sensor elements are present) are functionalized with a coating containing glucose oxidase.
Implementation Method 2
The working electrode, counter electrode, and reference electrode are each connected to an amperometry circuit, whose output voltage provides a measure of the glucose concentration in the liquid sample
Implementation Method 3
A highly sensitive electrochemical glucose sensor for saliva samples using a substrate with working, counter, and reference electrodes, functionalized with glucose oxidase and nanomaterials like single-walled carbon nanotubes
Data Source
AI summary
A glucose sensor suitable for measuring glucose levels in human saliva is provided. Systems containing the glucose sensor and methods for making and using the sensor are also provided. The glucose sensor is highly sensitive and can detect glucose levels at least down to 5 ppm. Fabrication of the sensor involves depositing single-walled carbon nanotubes onto the surface of a working electrode in a 3 electrode electrochemical detector and functionalizing the nanotubes by depositing layers of polymers, metallic nanoparticles, and glucose oxidase enzyme onto the nanotubes. The sensor can be used as a disposable, single-use device or as part of an analytical system, such as a microfluidics system, for the analysis of multiple analytes. The sensor enables the diagnosis and monitoring of diabetes to be performed without pain or the need for finger pricks in a home or clinical setting.