Biosensor Electron-Beam Hydrogel Immobilization for Reproducible Sensitivity
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Solution Overview
Problem
Existing biosensor production methods face challenges in achieving reproducible, sensitive, and selective detection of analytes in body fluids, particularly in non-invasive applications like saliva, due to issues such as cross-sensitivity, fouling, and variability in sensitivity and shelf-life, especially when used repeatedly.
Innovation Solution
A method involving low-energy electron beam irradiation of a polymer solution containing biomolecules, such as antibodies, to create a porous hydrogel matrix that immobilizes biomolecules with precise control over porosity and biomolecule concentration, allowing for efficient and reproducible biosensor production without the need for additional chemicals or functionalization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional chemical immobilization methods are used to attach biomolecules to electrodes, then biomolecules can be fixed on the electrode surface, but the production process becomes complex requiring multiple functionalization steps and additional chemicals
Solution Approach 1:
The patent extracts and removes the complex chemical functionalization steps from the biosensor production process. Instead of using multi-step chemical immobilization methods requiring various functional groups and crosslinking agents, the invention uses direct electron beam irradiation to create a simplified single-step immobilization process that achieves the same biomolecule fixation without the intermediate chemical processing steps
Solution Approach 2:
The patent replaces the chemical system (chemical bonds, functional groups, crosslinking reactions) with a physical system (electron beam irradiation). The electron beam provides direct energy to form stable attachments between biomolecules and the electrode surface through physical interactions rather than chemical reactions, eliminating the need for chemical functionalization reagents and complex reaction control
2Reliability
If conventional biosensor production methods are used, then biomolecules can be immobilized on electrodes, but batch-to-batch variation in sensitivity occurs
Solution Approach 1:
The patent changes the fundamental parameter of immobilization from chemical reaction conditions (temperature, pH, reagent concentrations, reaction time) to physical electron beam parameters (irradiation dose, beam energy, exposure time). This parameter change enables more precise and reproducible control over the immobilization process, as electron beam parameters can be more accurately controlled and standardized across different production batches compared to chemical reaction conditions
Solution Approach 2:
The electron beam irradiation process is self-regulating in that the energy deposition and molecular attachment occur automatically through physical interactions without requiring external chemical agents or complex reaction monitoring. The process inherently provides consistent results based on the irradiation parameters, reducing operator variability and environmental sensitivity that plague chemical methods
3Productivity
If repeated measurements are performed with the same biosensor, then the device can be used multiple times, but fouling of the electrode surface occurs due to protein residues
Solution Approach 1:
The patent applies preliminary electron beam irradiation treatment to the electrode surface before biomolecule immobilization. This preliminary irradiation creates a stable, crosslinked surface structure that is resistant to fouling. By preparing the surface in advance with this stable structure, the electrode becomes less susceptible to protein adsorption and contamination during subsequent repeated measurements, extending the usable life of the biosensor
4Productivity
If standard biosensor manufacturing is used, then production can proceed, but costs are increased due to multiple processing steps and chemicals
Solution Approach 1:
The patent merges multiple separate manufacturing steps (surface preparation, functionalization, biomolecule attachment, crosslinking) into a single electron beam irradiation step. This consolidation eliminates the need for multiple processing stages, reduces the number of handling operations, and removes the requirement for various chemical reagents and their associated disposal costs, thereby reducing overall manufacturing complexity and cost while maintaining production efficiency
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 method enables high reproducibility and cost-effective biosensor production with stable sensitivity and long shelf-life, preventing fouling and cross-sensitivity, suitable for non-invasive analyte detection in body fluids like saliva.
Implementation Method 1
subjecting the solution comprising the added biomolecules and dispensed on the carrier to an ebeam to immobilize the biomolecules
Data Source
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AI summary
A method of producing a biosensor or a part thereof is disclosed. The biosensor or part thereof comprises a porous polymer; biomolecules suitable for reaction with an analyte to be sensed by said biosensor, said biomolecules being immobilized by the polymer matrix; a carrier for the polymer matrix, the carrier allowing read-out of reactions of the biomolecules with an analyte. The method disclosed comprises the steps of providing a polymer solution; adding the biomolecules to the solution in defined quantities; dispensing a specific volume of the solution with the added biomolecules onto the carrier; subjecting the solution comprising the added biomolecules and dispensed on the carrier to an ebeam and preferably to drying to remove any solvent and to thus immobilize the biomolecules.