Conducting Polymer Biosensor with Nanoparticle Immobilization
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Solution Overview
Problem
Current conducting polymer-based biosensors require individual optimization of parameters for each type of biomolecular probe, making them inefficient for universal immobilization with high surface density and binding activity.
Innovation Solution
A method involving doping a conducting polymer solution with negatively charged nanoparticles containing a capture moiety, followed by polymerization on an electrode surface, which traps the nanoparticles and allows for high-affinity binding with biological polymers of interest, creating a universal platform for probe immobilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If biomolecular probes are directly incorporated into polymer film by mixing with monomer solution, then immobilization can be achieved through single-step fabrication, but immobilization efficiency is insufficient and requires individual parameter optimization for each probe type
Solution Approach 1:
The patent introduces negatively charged nanoparticles as an intermediary component between the polymer matrix and biomolecular probes. These nanoparticles serve as mediators that enhance probe immobilization through electrostatic interactions, allowing efficient immobilization across different probe types without requiring individual parameter optimization. The nanoparticles act as a universal platform that maintains probe activity while enabling reliable attachment.
2Device complexity
If conventional direct incorporation method is used, then fabrication process is simple, but surface density and binding activity of immobilized probes are insufficient
Solution Approach 1:
The patent applies local quality by concentrating probe immobilization at the nanoparticle surfaces rather than distributing probes uniformly throughout the bulk polymer. The negatively charged nanoparticles create localized regions of high probe density and binding activity. This localized concentration approach achieves high surface density without complicating the overall fabrication process, as the nanoparticles are simply mixed into the monomer solution before polymerization.
3Reliability
If parameter optimization is performed for each probe type, then immobilization efficiency improves, but time consumption and process complexity increase significantly
Solution Approach 1:
The negatively charged nanoparticles serve as a universal platform that works effectively with multiple types of biomolecular probes (oligonucleotides, antibodies, enzymes, etc.) without requiring separate optimization procedures. The electrostatic interaction mechanism provided by the charged nanoparticles is broadly applicable across different probe types, enabling a single standardized protocol to achieve high immobilization efficiency for diverse biomolecules.
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 efficient immobilization of various biomolecules with high surface density and binding activity, improving signal transduction efficiency and allowing for precise control over probe density, enhancing detection sensitivity and specificity.
Implementation Method 1
doping a solution of monomeric units of a conducting polymer with negatively charged nanoparticles comprising a capture moiety; and polymerizing the monomeric units on the surface of the sensor comprising an electrode, thereby trapping the nanoparticles on the surface of the sensor
Implementation Method 2
polymerizing the monomeric units on the surface of the sensor comprising an electrode, thereby trapping the nanoparticles on the surface of the sensor
Implementation Method 3
doping a solution of monomeric units of a conducting polymer with negatively charged nanoparticles comprising a capture moiety
Data Source
AI summary
The present invention provides methods of making polymer-based biosensors and the biosensors made by said methods, wherein the biosensors comprise conducting polymers and negatively charged nanoparticles comprising a capture moiety. The present invention also provides methods of detecting analytes in a solution by contacting the solution with said polymer-based biosensors.