Publication detail

Temperature non-uniformity detection on dPCR chips and temperature sensor calibration

GAŇOVÁ, M. WANG, X. YAN, Z. ZHANG, H. LEDNICKÝ, T. KORABEČNÁ, M. NEUŽIL, P.

Original Title

Temperature non-uniformity detection on dPCR chips and temperature sensor calibration

Type

journal article in Web of Science

Language

English

Original Abstract

A microfluidic-based digital polymerase chain reaction (dPCR) chip requires precise temperature control as well as uniform temperature distribution to ensure PCR efficiency. However, measuring local temperature and its distribution over thousands of μL/nL-volume samples with minimum disturbance is challenging. Here, we present a method of non-contact localized temperature measurement for determination of the non-uniformity of temperature distribution over a dPCR chip. We filled the dPCR chip with a PCR solution containing amplified DNA fragments with a known melting temperature (TM). We then captured fluorescent images of the chip when it was heated from 70 to 99 °C, plotted the fluorescence intensity of each partition as a function of temperature, and calculated measured TM values from each partition. Finally, we created a 3-D map of the dPCR chip with the measured TM as the parameter. Even when the actual TM of the PCR solution was constant, the measured TM value varied between locations due to temperature non-uniformity in the dPCR chip. The method described here thereby characterized the distribution of temperature non-uniformity using a PCR solution with known TM as a temperature sensor. Among the non-contact temperature measurement methods, the proposed TM-based method can determine the temperature distribution within the chip, instead of only at the chip surface. The method also does not suffer from the undesirable photobleaching effect of fluorescein-based temperature measurement method. Temperature determination over the dPCR chip based on TM allowed us to calibrate the temperature sensor and improve the dPCR configuration and precision. This method is also suitable for determining the temperature uniformity of other microarray systems where there is no physical access to the system and thus direct temperature measurement is not possible.

Keywords

Fluorescence; Photobleaching; Polymerase chain reaction; Temperature measurement; Temperature sensors; Thermometers

Authors

GAŇOVÁ, M.; WANG, X.; YAN, Z.; ZHANG, H.; LEDNICKÝ, T.; KORABEČNÁ, M.; NEUŽIL, P.

Released

12. 1. 2022

Publisher

Royal Society of Chemistry

ISBN

2046-2069

Periodical

RSC Advances

Year of study

12

Number

4

State

United Kingdom of Great Britain and Northern Ireland

Pages from

2375

Pages to

2382

Pages count

8

URL

https://pubs.rsc.org/en/content/articlelanding/2022/RA/D1RA08138A

Full text in the Digital Library

http://hdl.handle.net/11012/204605

BibTex

@article{BUT176929,
  author="Martina {Gaňová} and Xinlu {Wang} and Zhiqiang {Yan} and Haoqing {Zhang} and Tomáš {Lednický} and Marie {Korabečná} and Pavel {Neužil}",
  title="Temperature non-uniformity detection on dPCR chips and temperature sensor calibration",
  journal="RSC Advances",
  year="2022",
  volume="12",
  number="4",
  pages="2375--2382",
  doi="10.1039/d1ra08138a",
  issn="2046-2069",
  url="https://pubs.rsc.org/en/content/articlelanding/2022/RA/D1RA08138A"
}