Carbene-PEG Gold Nanoparticle Complexes for Stable Biosensor Binding
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Solution Overview
Problem
Conventional gold nanoprobe surface treatments, such as those using thiol, result in instability under high salt concentration, acid/base solutions, and extreme temperatures, limiting their use and storage, while carbene-gold nanoparticles lack functional groups for biosensor applications.
Innovation Solution
A carbene compound with polyethylene glycol (PEG) and nitrogen-containing functional groups is synthesized to stabilize gold nanoparticles, forming a carbene-metal nanoparticle complex with enhanced stability and functional sites for bio-probe immobilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thiol is used for gold nanoparticle surface treatment, then binding strength to gold is improved, but stability under high salt concentration, acid/base solution, and extreme temperatures deteriorates
Solution Approach 1:
The patent changes the chemical parameter of the surface treatment agent from thiol to carbene compound, which fundamentally alters the binding mechanism to Au-C bonds that are stable under extreme conditions including high salt concentration, acid/base solutions, and temperatures from -20°C to 100°C
Solution Approach 2:
The patent creates a composite surface treatment system combining carbene compound with functional groups (amine, carboxylic acid, or thiol) attached to the carbene-gold nanoparticle complex, providing both strong binding and additional functionality for biosensor applications
2Strength
If carbene-gold nanoparticles are synthesized without functional groups, then binding strength is improved, but applicability to biosensors deteriorates
Solution Approach 1:
The patent makes the carbene-gold nanoparticle complex multi-functional by attaching different functional groups (amine, carboxylic acid, or thiol) to the carbene ligand, enabling the same core structure to serve both as a stable gold nanoparticle anchor and as a platform for various biosensor applications including LFA, ELISA, and electrochemical sensors
Solution Approach 2:
The patent introduces functional groups at specific locations on the carbene ligand structure, allowing different regions of the molecule to perform different functions: the carbene carbon provides strong Au-C binding while the terminal functional groups provide biosensor-specific interactions
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 carbene-metal nanoparticle complex maintains stability across various environments, allowing for robust bio-probe immobilization and effective use in biosensors like LFA diagnostic kits.
Implementation Method 1
the reactivity between a carbene compound and gold atoms is high and strong binding is enabled
Implementation Method 2
thiol has a high binding strength to gold (Au)
Data Source
AI summary
The present invention relates to a carbene compound having substituted at the terminal polyethylene glycol (PEG) having nitrogen-containing functional groups, a carbene-metal nanoparticle complex in which the carbene compound and metal nanoparticles are bounded, a preparation method thereof, and a biosensor using same.