Amperometric Immuno-sensing System for Zepto-molar Detection
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Solution Overview
Problem
Current electrochemical detection systems face limitations in sensitivity due to low interfacial charge transfer, making it challenging to detect target analytes at extremely low concentrations, particularly for early disease diagnosis and emerging pathogens.
Innovation Solution
An amperometry/voltammetry system with an external voltage generator is used to create a gating voltage that enhances the rate of quantum mechanical tunneling of charges between the electrode and the analyte, improving sensitivity by inducing an electric field at the electrode-solution interface, allowing for the detection of analytes at zepto-molar concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional electrochemical detection is used, then substance selectivity is achieved through enzyme-analyte specific interaction, but sensitivity is limited due to low interfacial charge transfer
Solution Approach 1:
The patent applies dynamics by making the electric field adjustable and time-dependent through an external voltage generator. The gating voltage can be dynamically modulated to optimize charge transfer rates at different measurement conditions, transforming the static interface into a dynamically controllable system that enhances sensitivity without sacrificing selectivity
Solution Approach 2:
The patent changes the physical parameter of the electric field at the electrode-solution interface by applying an external gating voltage. This parameter change directly modifies the interfacial charge transfer characteristics, enabling ultrasensitive detection by optimizing the electric field strength to maximize tunneling current while maintaining enzyme selectivity
2Measurement precision
If detection sensitivity is improved to detect extremely low concentrations, then detection limit is reduced, but device complexity increases due to external voltage generator and field control
Solution Approach 1:
The external voltage generator serves multiple functions: it establishes the baseline operating potential, applies gating voltage to enhance charge transfer, and enables various voltammetric measurement modes (cyclic, linear, pulse, square wave). This multi-functionality reduces the need for separate components for each measurement type, making the increased complexity worthwhile for achieving zepto-molar detection limits
3Power
If external voltage is applied to enhance charge transfer, then current flow is enhanced, but energy consumption increases
Solution Approach 1:
The patent employs periodic action through pulsed voltammetric techniques where the external voltage is applied in controlled pulses rather than continuously. This allows the system to achieve enhanced charge transfer during active measurement windows while reducing energy consumption during idle periods, optimizing the power-energy tradeoff for ultrasensitive 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
The system achieves an 18-orders-of-magnitude improvement in glucose detection limit, enabling detection in the zepto-molar range with preserved enzymatic selectivity, and demonstrates a 106-fold improvement over prior art, effectively detecting analytes at extremely low concentrations.
Implementation Method 1
to enhance the rate of quantum mechanical tunneling of charges from the substance to the electrode
Implementation Method 2
generates a gating voltage that rearranges the ions in the sample solution at the electrode-solution interface and therefore induces an electric field that permeates at least a portion of the oxidoreductase
Data Source
AI summary
An embodiment of the invention provides an ultrasensitive and selective system and method for detecting reactants of the chemical/biochemical reaction catalyzed by an oxidoreductase, such as glucose and ethanol, at a concentration level down to zepto molar (10−21 M). In embodiments, the invention provides an ampyometric immuno-sensing system comprising a working electrode, an oxidoreductase, and an external voltage generator, wherein the oxidoreductase is immobilized on the working electrode; and the voltage generator generates a voltage to induce an electric field that permeates at least a portion of the interface between the oxidoreductase and the working electrode. The ultrasensitivity of the system and method is believed to be caused by the electrical field, which enhances the quantum mechanical tunneling effect in the interface, and therefore facilitates the interfacial electron transfer between the oxidoreductase and the working electrode.