Electrode-Surface pH Control for Multiplexed Biosensor Binding
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Solution Overview
Problem
Current biosensors face challenges in accurately and reliably controlling pH levels in biological solutions due to complex interactions with buffer components, nucleophiles, and interfering electrochemically active components, which affects the sensitivity and specificity of biomolecular detection assays.
Innovation Solution
A method involving a biosensor with a multisite array of test sites, using electrochemically active agents, enzymes, and buffer inhibitors to modulate pH or ionic concentration near electrode surfaces, allowing independent control of conditions for each test site, and a system for detecting bubbles in aqueous solutions using capacitance measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional pH control methods are used in biological solutions, then pH levels can be adjusted, but the control accuracy and reliability deteriorate due to complex interactions with buffer components, nucleophiles, and interfering electrochemically active components
Solution Approach 1:
The patent divides the control system into multiple independent working electrodes, each capable of independent pH control at different test sites. This segmentation allows localized pH modulation without interference from buffer components and other electrochemically active substances in the bulk solution, thereby improving both accuracy and reliability of pH control.
Solution Approach 2:
The patent implements local pH control at each electrode surface by using specific electrochemically active agents that generate H+ or OH- ions only in the immediate vicinity of each working electrode. This local quality approach ensures precise pH control at each test site while avoiding global pH changes that would be affected by buffer capacity and interfering components.
2Adaptability or versatility
If multiple test sites are used to improve diagnostic capability, then the ability to detect multiple biomolecules is improved, but the complexity of controlling pH conditions at each site increases
Solution Approach 1:
The patent employs a universal control architecture where a single controller manages multiple working electrodes through standardized control protocols. Each working electrode uses the same electrochemical principles and control algorithms, allowing the system to scale to multiple test sites without proportionally increasing control complexity. The controller can independently modulate pH at each site while using the same underlying technology and control strategies.
3Measurement precision
If electrochemically active agents are used to modulate pH, then pH control capability is improved, but cross-reactivity with other biomolecules increases
Solution Approach 1:
The patent introduces buffer inhibitors as intermediary substances that mediate between the electrochemically active agents and the bulk buffer solution. These inhibitors selectively block the interaction between generated H+/OH- ions and buffer components, allowing precise pH modulation at the electrode surface while preventing cross-reactivity with buffer体系和 other biomolecules in the solution.
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
Enables precise and reproducible modulation of pH levels, improving the accuracy and reliability of biomolecular interactions and reducing cross-reactivity, while also detecting bubbles to prevent experimental errors.
Implementation Method 1
The pH of the solution is controlled by an amount of H+ ions produced by an electrochemical reaction of a redox active species in the solution
Implementation Method 2
A method and corresponding devices and systems for detecting the presence of bubbles in an aqueous solution
Data Source
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.