Plasmonic Photothermal Gene Detection for Rapid Field Diagnosis
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Solution Overview
Problem
Current diagnostic methods for dengue virus detection are not sufficiently simple, cost-effective, or sensitive for use in remote areas with limited healthcare access, posing challenges for rapid and accurate diagnosis.
Innovation Solution
A plasmonic photothermal (PPT)-reverse transcription-colorimetric polymerase chain reaction (RTcPCR) method using plasmonic nanoparticles, 3,3′,5,5′-tetramethylbenzidine, and SYBR Green I, which enables rapid and visual detection of target genes through a colorimetric reaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional PCR methods are used for dengue virus detection, then detection accuracy can be maintained, but the detection process is complex and time-consuming, making it unsuitable for field use in remote areas
Solution Approach 1:
The patent combines multiple functions into a single integrated system: plasmonic nanoparticles serve as both amplification agents and detection sensors, while the mobile device integrates sample collection, PCR amplification, and colorimetric detection capabilities. This merging eliminates the need for separate laboratory equipment and multiple processing steps, enabling rapid field detection within 60 minutes while maintaining diagnostic accuracy.
Solution Approach 2:
The diagnostic system is designed with multi-functionality to operate independently in field conditions: the mobile device performs both sample processing and detection, the plasmonic nanoparticles provide both amplification and visual signaling, and the colorimetric reaction serves as both the detection mechanism and the visual output method. This universal design allows the system to function as a complete standalone diagnostic platform without requiring external laboratory infrastructure.
2Measurement precision
If conventional diagnostic tests are used, then detection sensitivity can be achieved, but the tests require complex equipment and procedures that are not cost-effective for remote areas
Solution Approach 1:
The patent employs disposable plasmonic nanoparticle probes that are inexpensive to manufacture and use. These nanoparticles can be synthesized through simple chemical processes and are designed for single-use in field conditions. The mobile device itself is a relatively low-cost platform compared to traditional laboratory equipment, making the overall system economically viable for deployment in remote areas with limited resources.
Solution Approach 2:
The detection mechanism utilizes colorimetric changes produced by plasmonic nanoparticles that change color in response to dengue virus detection. This visual color change provides a simple, equipment-free readout method that maintains high detection sensitivity while eliminating the need for complex instrumentation. The colorimetric approach allows results to be read by the naked eye or captured by a simple camera on the mobile device, significantly reducing costs compared to conventional diagnostic equipment.
3Loss of time
If rapid detection methods are implemented, then detection time is reduced, but detection specificity may be compromised
Solution Approach 1:
The patent implements preliminary action through pre-designed plasmonic nanoparticle probes that are specifically functionalized to recognize dengue virus antigens before the actual detection process begins. The mobile device also performs preliminary sample preparation and processing steps that ensure only relevant targets are amplified and detected. This preliminary functionalization and preparation maintain high detection specificity by ensuring that the rapid 60-minute process only detects the intended target without cross-reactivity or false positives.
Data Source
AI summary
The present invention relates to a plasmon-based target gene detection method. The present invention involves performing an RT-PCR reaction using plasmonic nanoparticles, adding SYBR Green I and 3,3′,5,5′-tetramethylbenzidine, and visually detecting the presence of a target gene by irradiating an LED. The present invention solves the problem of the related art in which it was not easy to visually detect a target gene, thereby detecting the target gene with excellent sensitivity and specificity in a short period of time.