Smart Glass Slide for Microarrays with pH Modulation
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Solution Overview
Problem
Current biosensors face challenges in achieving sensitivity and specificity due to limitations in detection assays, including sensitivity and cross-reactivity, which affect the minimum detectable concentration and diagnostic error rate, and require complex and costly assay development to optimize reagents and conditions for accurate biomolecular analyte measurement.
Innovation Solution
A device and method for accurately and reproducibly controlling pH near electrode surfaces in a multisite biosensor array using a transparent support substrate with immobilized pH-sensitive Fluorescent Protein and electrodes, allowing for independent modulation of biomolecular interactions by electrochemically reacting an electrochemically active agent to produce H+ or OH- ions, thereby varying the pH and ionic concentration at each test site.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional detection assays are used in biosensors, then the structure is simple, but sensitivity and specificity are limited due to cross-reactivity and background signal
Solution Approach 1:
The invention divides the detection system into multiple independent test sites (first test site, second test site, third test site) on a single substrate. Each site can independently measure different aspects of biomolecular interactions under different conditions, allowing simultaneous acquisition of multiple data points needed for accurate analyte concentration determination while reducing cross-reactivity effects
Solution Approach 2:
A single biosensor substrate integrates multiple test sites that perform different functions: the first test site measures specific binding, the second test site measures non-specific binding, and the third test site measures physisorption. This multi-functional platform enables comprehensive characterization of biomolecular interactions and accurate analyte quantification in one device
2Measurement precision
If multiple test sites with different reaction conditions are implemented, then sensitivity and specificity improve through multiple measurements, but device complexity increases
Solution Approach 1:
Each test site on the substrate is equipped with specific probes tailored to its measurement function. The first test site has probes for specific biomolecular interactions, the second has probes for non-specific binding, and the third has probes for physisorption. This localized optimization of probe types at each site enables precise measurement of different interaction types while maintaining overall system manageability
Solution Approach 2:
The invention introduces pH-sensitive fluorescent proteins as intermediaries to monitor and control pH gradients at each test site. These fluorescent proteins provide real-time feedback on local pH conditions, enabling accurate control of reaction conditions at each site without requiring complex direct pH measurement systems
3Measurement precision
If pH gradients are controlled to modulate biomolecular interactions, then binding efficiency varies across sites improving measurement accuracy, but control reliability is challenging
Solution Approach 1:
The invention implements feedback control by using pH-sensitive fluorescent proteins to monitor pH levels at each test site in real-time. The fluorescence intensity of these proteins changes with pH, providing continuous feedback that allows the system to maintain accurate pH gradients across different test sites, ensuring reproducible binding efficiency modulation
Solution Approach 2:
The invention systematically varies pH as a key parameter across different test sites to modulate biomolecular interaction efficiency. By controlling pH at the first test site to be different from the second and third test sites, the system optimizes binding conditions for different measurement purposes, improving overall measurement accuracy while maintaining reliable control
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 precise and reliable detection of biomolecular analytes by reducing variations in pH modulation, improving the accuracy and reproducibility of biomolecular interactions, and reducing the complexity and cost of assay development.
Implementation Method 1
a biomolecular interface layer having immobilized pH sensitive Fluorescent Protein
Implementation Method 2
electrochemically reacting an electrochemically active agent to produce H+ or OH- ions, thereby varying the pH and ionic concentration at each test site
Data Source
AI summary
Device for use in a biosensor comprising a multisite array of test sites, the device being useful for modulating the binding interactions between a (biomolecular) probe or detection agent and an analyte of interest from a biological by modulating the pH or ionic gradient near the electrodes in such biosensor. The device provides a biosensor which is more accurate, reliable and the results of which are more reproducible. Analytic methods for more accurately measuring an analyte of interest in a biological sample are also provided.