SERS Saliva Testing for Rapid SARS-CoV-2 Classification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for SARS-CoV-2 virus detection, such as RT-PCR, are time-consuming, expensive, and prone to false-negative/false-positive results, necessitating a rapid, cost-effective, and accurate method that maintains high sensitivity and specificity.
Innovation Solution
A method using surface-enhanced Raman spectroscopy (SERS) with chemometric analysis on silicon substrates prepared by laser ablation and coated with silver, analyzing saliva or nasopharyngeal samples to identify characteristic spectral bands and classify samples as CoV(+) or CoV(-) within 15 minutes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RT-PCR technique is used for SARS-CoV-2 detection, then sensitivity and specificity are improved, but analysis time increases significantly and cost increases
Solution Approach 1:
The patent replaces the complex biochemical amplification system of RT-PCR with a direct optical detection system using surface-enhanced Raman spectroscopy. The SERS technique uses laser excitation and spectral analysis to directly detect viral components without requiring multiple biochemical reaction steps, thereby dramatically reducing analysis time while maintaining detection accuracy through the high sensitivity of Raman signal enhancement on metal substrates.
Solution Approach 2:
The patent changes the detection parameter from measuring amplified DNA/RNA products (in RT-PCR) to measuring direct molecular vibrational spectra (in SERS). By using surface-enhanced Raman spectroscopy with appropriate laser wavelengths and metal substrate enhancement, the method achieves sufficient signal intensity for direct detection without amplification, thus reducing analysis time while preserving detection sensitivity.
2Measurement precision
If RT-PCR technique is used for SARS-CoV-2 detection, then sensitivity and specificity are improved, but cost of chemical reagents increases
Solution Approach 1:
The patent substitutes the expensive biochemical reagent system of RT-PCR (including enzymes, nucleotides, buffers, and primers) with a physical optical detection system. The SERS method uses a laser source and metal substrate to enhance Raman signals, eliminating the need for costly consumable biochemical reagents while maintaining detection accuracy through physical signal enhancement mechanisms.
Solution Approach 2:
The patent employs disposable SERS substrates (metal-coated slides or nanoparticles) that are inexpensive compared to RT-PCR reagent kits. These substrates can be mass-produced using simple coating techniques and serve as single-use detection platforms, significantly reducing per-test material costs while maintaining consistent detection performance.
3Measurement precision
If RT-PCR technique is used for SARS-CoV-2 detection, then detection capability is improved, but false-negative and false-positive results occur
Solution Approach 1:
The patent uses a universal detection approach where SERS detects general molecular vibrational signatures present in all SARS-CoV-2 samples regardless of specific mutations. The broad spectral fingerprinting capability of Raman spectroscopy allows detection of conserved viral components that are less susceptible to mutation-driven escape, thereby reducing false negatives and positives compared to mutation-specific RT-PCR primers.
Solution Approach 2:
The patent implements spectral analysis with reference database comparison and chemometric processing that provides feedback validation. The detected Raman spectra are compared against known viral spectral patterns, and statistical analysis confirms detection confidence, reducing false results through multiple layers of verification rather than relying on a single amplification signal.
4Measurement precision
If SERS platform is made by spark ablation, then enhancement factor is improved, but manufacturing complexity increases
Solution Approach 1:
The patent replaces the complex spark ablation process (which requires specialized equipment and precise control of electrical discharges) with a simpler physical vapor deposition or chemical vapor deposition process. These alternative methods use well-established thin-film deposition techniques to create uniform metal layers on substrates, achieving comparable or sufficient SERS enhancement while dramatically simplifying manufacturing and reducing equipment requirements.
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
Provides rapid, accurate, and cost-effective SARS-CoV-2 virus detection with high sensitivity and specificity, reducing false results by leveraging SERS and chemometric methods on prepared substrates.
Implementation Method 1
a collected liquid sample is applied onto a high enhancement factor SERS platform made by laser ablation
Implementation Method 2
surface-enhanced Raman spectroscopy (SERS) technique together with chemometric analysis
Implementation Method 3
a liquid sample matrix applied onto the SERS platform is evaporated
Implementation Method 4
The SERS platform with the evaporated sample is subjected to surface-enhanced Raman spectroscopy technique in order to obtain SERS spectra
Data Source
Figure 1~2
Figure 3a~3b
Figure 4~5a
AI summary
The subject of the invention is a method of SARS-CoV-2 virus detection in clinical samples, especially in saliva, characterized by the steps in which a collected liquid sample is applied onto a SERS platform with a high enhancement factor made by laser ablation, the liquid sample matrix applied onto the SERS platform is evaporated, the SERS platform with the evaporated sample is subjected to testing by the surface-enhanced Raman spectroscopy technique obtaining SERS spectra, the obtained SERS spectra are subjected to chemometric analysis with the classification of the sample into the appropriate CoV(+) or CoV(-) group.