Electrode-Surface pH Modulation for Reliable Biosensor Arrays
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Solution Overview
Problem
Current biosensors face challenges in accurately and reliably controlling pH levels in biological solutions due to complex system interactions, including buffer components, co-solvents, and interfering electrochemically active components, which affect the accuracy and reproducibility of biomolecular analyte detection.
Innovation Solution
A method and device for controlling pH using electrochemical modulation with redox active molecules, such as quinones, that generate or consume hydrogen ions at electrode surfaces, allowing for precise pH adjustment while minimizing interference with nucleophiles and maintaining stability in biological buffers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional pH control methods are used in biosensors, then pH adjustment can be achieved, but accuracy and reproducibility deteriorate due to complex system interactions including buffer components, co-solvents, and interfering electrochemically active components
Solution Approach 1:
The patent introduces redox-active molecules as intermediary substances that mediate between the electrode and the buffer system. These molecules undergo reversible redox reactions at the electrode surface, generating protons or hydroxide ions that locally adjust pH without directly introducing interfering electrochemically active components into the bulk solution. This intermediary approach allows precise pH control while maintaining system reliability.
Solution Approach 2:
The patent employs controlled changes in electrochemical parameters (applied potential, current density, pulse duration) to modulate the pH at the electrode surface. By dynamically adjusting these parameters, the system achieves accurate and reproducible pH control despite the presence of buffer components and co-solvents that would otherwise interfere with conventional pH control methods.
2Measurement precision
If electrochemical modulation with redox active molecules is used, then pH control accuracy is improved, but device complexity increases due to the need for specific electrode configurations and control systems
Solution Approach 1:
The patent designs the electrochemical system with multi-functional electrodes that can perform both pH control and analytical measurements. The same electrode configuration used for generating pH changes can also detect the analyte, reducing the need for separate control and detection systems. This universal approach maintains pH control accuracy while minimizing device complexity.
Solution Approach 2:
The patent utilizes reversible redox reactions where the redox-active molecules are regenerated after each pH control cycle. The molecules that generate protons during oxidation are recovered during reduction, allowing repeated use of the same electrochemical system without depleting the active species. This recovery mechanism simplifies the system by eliminating the need for continuous replenishment of reagents.
3Productivity
If multiple test sites are used in a biosensor array, then testing capacity is increased, but pH control reliability deteriorates due to variations in local pH modulation between sites
Solution Approach 1:
The patent divides the biosensor into multiple independent test sites, each with its own electrode and redox-active molecule system. This segmentation allows each site to independently control and maintain its own pH conditions, preventing cross-interference between sites. The modular design ensures that pH control reliability is maintained across all test sites in the array, enabling high-throughput testing with consistent results.
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 approach enables accurate and reproducible pH control in biosensors, enhancing the reliability and sensitivity of biomolecular analyte detection by maintaining the stability of proteins and enzymes, and reducing cross-reactivity and background signals.
Implementation Method 1
electrochemically generate and/or consume hydrogen ions in the solution by an electrochemical reaction of one or more redox active species
Implementation Method 2
Release of protons from a 3D layer of electroactive material was demonstrated by Frasconi et al. using materials composed of gold nanoparticles and thioanilines. Electrochemical oxidation of thioaniline groups produced protons that diffused from electrode surface into the surrounding solution, thus altering its pH.
Data Source
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AI summary
Device and methods for use in a biosensor comprising a multisite array of test sites, the device and methods being useful for modulating the binding interactions between a (biomolecular) probe or detection agent and an analyte of interest by modulating the pH or ionic gradient near the electrodes in such biosensor. An electrochemically active agent that is suitable for use in biological buffers for changing the pH of the biological buffers. Method for changing the pH of biological buffers using the electrochemically active agents. The methods of modulating the binding interactions provided in a biosensor, analytic methods for more accurately controlling and measuring the pH or ionic gradient near the electrodes in such biosensor, and analytic methods for more accurately measuring an analyte of interest in a biological sample.