Abstract
Temperature control is the most important and fundamental part of a polymerase chain reaction (PCR). To date, there have been several methods to realize the periodic heating and cooling of the thermal-cycler system for continuous-flow PCR reactions, and three of them were widely used: the thermo-cycled thermoelectric cooler (TEC), the heating block, and the thermostatic heater. In the present study, a new approach called open-loop controlled single thermostatic TEC was introduced to control the thermal cycle during the amplification process. Differing from the former three methods, the size of this microdevice is much smaller, especially when compared to the microdevice used in the heating block method. Furthermore, the rising and cooling speed of this method is much rapider than that in a traditional TEC cycler, and is nearly 20–30% faster than a single thermostatic heater. Thus, a portable PCR system was made without any external heat source, and only a Teflon tube-wrapped TEC chip was used to achieve the continuous-flow PCR reactions. This provides an efficient way to reduce the size of the system and simplify it. In addition, through further experiments, the microdevice is not only found to be capable of amplification of a PCR product from Human papillomavirus type 49 (Genbank ref: X74480.1) and Rubella virus (RUBV), but also enables clinical diagnostics, such as a test for hepatitis B virus.
Highlights
Polymerase chain reaction (PCR) technology is a method for amplifying a target DNA sequence in vitro
The two lanes on the right of the ladder were gained by the commercial qPCR cycler (Bio Rad) and the present system
We introduced a novel mechanism, in which a single thermoelectric cooler (TEC) was used as a thermal represent the products gained by the commercial qPCR cycler (Bio Rad) and the present system
Summary
Polymerase chain reaction (PCR) technology is a method for amplifying a target DNA sequence in vitro. A new approach called open-loop controlled single thermostatic TEC was introduced, to control the thermal cycle during the amplification process of continuous-flow PCR reactions. Sensors 2019, 19, 1609 called open-loop controlled single thermostatic TEC was introduced, to control the thermal cycle during the amplification process of continuous-flow PCR reactions. 1b, TEC1b, is TEC controlled by a circuit to achieve the denaturation stage and annealing stage stage temperatures suitable for a PCR reaction. TEC needs circuit control and a temperatures suitable for a PCR reaction. 63 same is When more, this only requires an open loop 95°C, the low temperature region reaches Whatwith is more, this system only requires an open loop integrated circuit (IC) to maintain the proper voltage, no need for complex circuit control. DC power supply ofconsumption only 3.6 V and power system), and withsystem), an optionand of awith
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