Quantitative Analysis of Fluorescence Detection Using a Smartphone Camera for a PCR Chip

Area of Science:

• Biotechnology
• Molecular Biology
• Medical Diagnostics

Background:

• Commercial real-time polymerase chain reaction (RT-PCR) instruments are often bulky and expensive due to complex optical and fluorescent detection systems.
• There is a need for more accessible, portable, and cost-effective RT-PCR solutions for various applications.

Purpose of the Study:

• To develop and validate an ultra-small, high-performance, and low-cost RT-PCR system utilizing a smartphone camera module for fluorescence detection.
• To compare the performance of the proposed smartphone-based RT-PCR system against commercial instruments.

Main Methods:

• The proposed system integrates a smartphone camera module as a fluorescence detector for real-time polymerase chain reaction.
• Quantitative analysis of fluorescence intensity changes was performed.
• Threshold cycle (Ct) values were measured and compared between the camera-based system and a commercial RT-PCR instrument.

Main Results:

• The smartphone camera-based RT-PCR system demonstrated stable DNA amplification.
• Quantitative analysis showed comparable performance to commercial instruments, with an overall difference of only 0.76 cycles in measured threshold cycles.
• Set calibration further reduced the difference to 0.41 cycles, which was within the experimental variation of the commercial system.

Conclusions:

• A smartphone camera-based RT-PCR system offers a viable, low-cost, and compact alternative to traditional bulky instruments.
• The proposed system achieves high performance and accuracy in DNA amplification and fluorescence detection.
• This technology has the potential to significantly improve accessibility to RT-PCR diagnostics.