研究目的
To demonstrate the use of a plasmonic device as an efficient and low-cost PCR thermocycler for nucleic acid-based diagnosis, facilitating the detection of antibiotic resistance genes.
研究成果
The thermoplasmonic device effectively served as a light-driven thermocycler for PCR, enabling rapid and specific detection of pathogens. The integration of heating and temperature sensing on a single chip offers advantages in cost and efficiency, with potential applications in point-of-care diagnostics.
研究不足
The demonstrated system can only drive one PCR reaction chamber with a single light source. Future work will focus on scaling up the system and integrating DNA microarray technology for multiple gene detection.
1:Experimental Design and Method Selection:
The study utilized a thermoplasmonic device consisting of a one-dimensional metal grating for efficient light absorption and heat generation. A thin-film thermocouple was integrated for temperature monitoring. The device was controlled by an Arduino microcontroller for automated PCR assays.
2:Sample Selection and Data Sources:
Genomic DNAs were extracted from Acinetobacter baumannii, Klebsiella pneumonia, Escherichia coli, and Campylobacter for PCR amplification.
3:List of Experimental Equipment and Materials:
The setup included an 808 nm laser, the thermoplasmonic device, a PCR reaction chamber, a fluorescence detector, and an Arduino microcontroller. Materials included a silicone chamber, transparent plastic film, and acrylic slides.
4:Experimental Procedures and Operational Workflow:
The device was illuminated by a near-infrared laser to heat the PCR solution. Temperature was monitored and controlled via the integrated thermocouple. PCR assays included multiplex PCR and qPCR for gene amplification and analysis.
5:Data Analysis Methods:
Fluorescence intensity was measured for qPCR analysis. Gel electrophoresis was used to analyze PCR products.
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spectrometer
USB2000
Ocean Optics
Measure transmission and reflection spectra
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blue LED
M470D2
Thorlabs
Excitation source for fluorescence detection
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Arduino microcontroller
Arduino
Control and monitor the PCR thermocycling process
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near-infrared laser
Sunshine Electronics
Heat the thermoplasmonic device
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optical profilometer
F20
Filmetrics Inc.
Measure thickness and refractive index of the TiO2 layer
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desktop sputter
Desktop IV
Denton Vacuum LLC
Deposit metal layers on the substrate
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electron beam evaporator
BJD-1800
Temescal
Deposit TiO2 layer on the polymer grating
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CMOS camera
MixMart 2.0 MP, HD
Capture fluorescence images
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