Acoustic Wave Sensor Surface Crowding for Slower Binding Kinetics
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Acoustic wave sensor devices face challenges in detecting analyte binding kinetics due to rapid saturation at high analyte concentrations, making it difficult to accurately determine analyte concentration in samples.
Innovation Solution
Incorporating crowding agents, such as polyethylene glycol (PEG), on the sensor surfaces to slow down the binding kinetics of analytes, allowing for extended detection timeframes and maintaining signal intensity without reducing the amount of analyte capture ligands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the concentration of analyte capture ligand on the sensor surface is increased to maintain signal intensity, then the binding saturation occurs more rapidly, but the detection time frame becomes too short to accurately measure binding kinetics
Solution Approach 1:
The patent introduces crowding agents (such as PEG, dextran, or ficoll) as intermediary molecules on the sensor surface that physically occupy space and sterically hinder the binding between analyte and capture ligand. This mediator layer reduces the binding rate constant without decreasing the number of available capture ligands, thereby extending the detection time frame while preserving signal intensity capability.
Solution Approach 2:
The patent changes the physical-chemical parameters of the sensor surface by coating it with crowding agents that have specific molecular weights, concentrations, and chain lengths. These parameter adjustments create a crowded environment that slows binding kinetics while maintaining the density of analyte capture ligands, resolving the contradiction between measurement precision and detection time frame.
2Duration of action of moving object
If sample dilution is performed to extend detection time frame, then binding saturation is delayed, but the process complexity increases and error propensity rises
Solution Approach 1:
The patent applies crowding agents to the sensor surface in advance, before sample introduction. This preliminary modification of the sensor surface creates a built-in mechanism to slow binding kinetics, eliminating the need for subsequent sample dilution steps and reducing overall process complexity.
Solution Approach 2:
The patent extracts the function of extending detection time from the sample preparation step (dilution) and relocates it to the sensor surface modification step (crowding agent coating). This separation of functions simplifies the sample handling process while achieving the same kinetic extension effect.
3Quantity of substance
If sample dilution is used to detect high concentration analytes, then binding saturation is avoided, but low concentration analytes in the same sample cannot be effectively detected in multiplexing scenarios
Solution Approach 1:
The patent applies different concentrations or types of crowding agents to different sensor surfaces within the same array, creating locally optimized binding environments. High concentration analyte sensors can use higher crowding agent densities to extend detection time, while low concentration analyte sensors can use lower densities to maintain sensitivity, enabling simultaneous multiplexed detection across different concentration ranges.
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 determination of analyte concentrations by prolonging the detection time before saturation, allowing for more precise sensor data capture and supporting the detection of high and low concentration analytes without sample dilution.
Implementation Method 1
a crowding agent bound to the surface of the sensor... to slow kinetics of analyte binding to the analyte capture ligand
Implementation Method 2
The increased mass alters the wave propagation characteristics (e.g., magnitude, frequency, phase, etc.) of the sensor
Data Source
AI summary
A sensor device includes a sensor, which may include an acoustic wave resonator structure, having a surface to which analyte capture ligand is bound. The device also includes a crowding agent to reduce the rate of binding of an analyte in a sample composition to the analyte capture ligand when the sample composition is flowed across the surface of the sensor.