DNA-Au3+ Diagnostic Complex for Rapid High-Sensitivity Detection
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Solution Overview
Problem
Existing rapid on-site diagnostic kits suffer from low sensitivity due to limitations in antigen-antibody binding reactions and require dedicated equipment for PCR-based methods, leading to false negatives and inefficiencies in field detection.
Innovation Solution
A diagnostic complex comprising a spherical Au3+-DNA nanostructure and a nitrocellulose membrane configuration with capture agents and silver nanoparticles, utilizing a galvanic exchange reaction triggered by a dithiothreitol reagent to enhance sensitivity and provide rapid results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If antigen-antibody binding reaction is used for rapid on-site diagnosis, then rapid detection is achieved, but sensitivity is low leading to false negatives
Solution Approach 1:
The patent changes the detection parameter from direct antigen-antibody binding to a two-step process: first capturing target material with DNA-probe complexes, then amplifying the signal through galvanic exchange reaction that releases multiple gold ions per captured target. This parameter transformation enables both rapid detection and high sensitivity.
Solution Approach 2:
The patent introduces DNA-probe complexes as an intermediary between the target material and the detection system. These complexes capture target material and serve as platforms for subsequent gold ion release, mediating the detection process to achieve both speed and sensitivity.
2Measurement precision
If PCR-based method is used for target material detection, then sensitivity is greatly improved, but dedicated equipment is required and amplification takes time
Solution Approach 1:
The patent replaces the complex mechanical/thermal cycling system of PCR with a chemical-based galvanic exchange reaction. The DNA-probe complexes undergo spontaneous chemical reaction with gold ions, eliminating the need for thermal cyclers and dedicated PCR equipment while achieving comparable sensitivity.
Solution Approach 2:
The patent changes the amplification mechanism from enzymatic DNA replication (PCR) to chemical galvanic exchange reaction. This parameter change allows sensitivity amplification through simple chemical reaction kinetics rather than complex enzymatic cycles, enabling rapid amplification without specialized equipment.
3Ease of operation
If gold nanoparticle color change is used for detection, then visual detection is simple, but sensitivity decreases when target material is insufficient
Solution Approach 1:
The patent segments the detection function into two independent components: target capture by DNA-probe complexes and signal generation by gold ion release. This segmentation allows the signal generation step to be amplified independently, improving sensitivity without compromising the simplicity of visual detection.
Solution Approach 2:
The patent performs preliminary target capture and complex formation before the actual detection step. The DNA-probe complexes pre-concentrate target material, and then the galvanic exchange reaction releases multiple gold ions per captured target, amplifying the signal before visual detection occurs.
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 solution enables high-sensitivity, rapid on-site diagnosis with clear color changes indicating the presence of target substances, overcoming the limitations of existing kits and enabling accurate field detection without specialized equipment.
Implementation Method 1
the probe DNA includes an Au3+ ion (gold ion) and a thiol group selectively bound to the Au3+ ion
Implementation Method 2
utilizing a galvanic exchange reaction triggered by a dithiothreitol reagent to enhance sensitivity and provide rapid results
Implementation Method 3
a spherical condensed ion collection nanostructure
Data Source
AI summary
The present invention relates to a complex for diagnosis, which is capable of rapidly diagnosing a target substance with high sensitivity, a rapid on-site diagnostic kit using the same and a diagnostic method, and the complex for diagnosis includes a probe DNA that binds to the target substance contained in a sample, and which can discharge thousands of Au3+ ions when a reagent is injected, thus enabling the rapid diagnosis of the target substance with high sensitivity.