Acoustic Wave Sensor Surface Crowding for Extended Binding Detection
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Solution Overview
Problem
Fluidic devices with acoustic wave sensors face challenges in detecting analyte binding kinetics due to rapid saturation at high analyte concentrations, making it difficult to accurately determine analyte concentration without sample dilution, which can introduce complexity and errors.
Innovation Solution
Incorporating crowding agents, such as polymers or proteins, on the sensor surface to slow down analyte binding kinetics, allowing for extended detection time frames and maintaining signal intensity without diluting the sample.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If sample dilution is used to extend detection time frame, then binding saturation is delayed, but process complexity and error propensity increase
Solution Approach 1:
The patent introduces crowding agents (such as PEG, dextran, or Ficoll) as intermediary substances that occupy space on the sensor surface and physically hinder analyte access to capture ligands. This mediates the binding process by slowing kinetics without requiring sample dilution, thereby extending detection time frame while avoiding the complexity of dilution procedures
Solution Approach 2:
The patent changes the physical-chemical parameters of the sensor surface by coating it with crowding agents that create a crowded environment. This alters the binding kinetics parameters (association rate constant ka) without changing the analyte concentration, allowing extended detection time while maintaining sample integrity and avoiding dilution-related complexity
2Duration of action of moving object
If sample dilution is used to extend detection time frame, then binding saturation is delayed, but measurement precision may deteriorate
Solution Approach 1:
Crowding agents act as mediators that slow binding kinetics through steric hindrance while maintaining the original analyte concentration. This preserves the signal intensity and binding affinity characteristics, allowing accurate concentration determination through kinetic analysis without the precision loss that may occur with dilution
Solution Approach 2:
The sensor surface is pre-coated with crowding agents before sample introduction. This preliminary action creates a crowded environment that will slow binding kinetics throughout the measurement, ensuring that the entire detection process occurs within an extended time frame while maintaining measurement precision through unchanged analyte concentration
3Duration of action of moving object
If crowding agents are used to slow binding kinetics, then detection time frame is extended, but signal intensity may be reduced
Solution Approach 1:
The patent applies crowding agents with specific molecular weights and concentrations tailored to each sensing zone, creating locally optimized conditions that balance kinetic slowing with signal maintenance. Different regions of the sensor surface can have different crowding agent densities to optimize for specific analyte concentrations or detection requirements
Solution Approach 2:
The patent optimizes parameters including crowding agent molecular weight (e.g., 10kDa to 200kDa PEG), concentration (e.g., 1mg/mL to 10mg/mL), and coating thickness to achieve the desired kinetic slowing while minimizing signal intensity reduction. These parameter adjustments allow tuning the balance between extended detection time and maintained signal strength
4Duration of action of moving object
If analyte capture ligand concentration is reduced to extend detection time, then binding saturation is delayed, but signal intensity decreases
Solution Approach 1:
Instead of reducing ligand concentration, the patent uses crowding agents as intermediaries to slow binding kinetics. This maintains the original ligand concentration and thus signal intensity while achieving extended detection time through kinetic slowing caused by the crowded environment
Solution Approach 2:
Rather than reducing ligand concentration to extend detection time (which reduces signal), the patent inverts the approach by maintaining ligand concentration for signal strength while using crowding agents to slow kinetics for extended detection time. This inverse strategy simultaneously achieves both goals
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 use of crowding agents extends the time frame for detecting analyte binding kinetics, enabling accurate concentration determination of high and low analyte concentrations without sample dilution, reducing errors and process complexity.
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
Implementation Method 3
sensors comprising acoustic wave resonator structures, such as bulk acoustic wave sensor structures
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 ratio 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.