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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00064165%3A_____%2F22%3A10437367" target="_blank" >RIV/00064165:_____/22:10437367 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216305:26620/22:PU143790 RIV/00216208:11110/22:10437367

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=VJg6ukDrvq" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=VJg6ukDrvq</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/d1ra08138a" target="_blank" >10.1039/d1ra08138a</a>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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 mu L/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 (T-M). We then captured fluorescent images of the chip when it was heated from 70 to 99 degrees C, plotted the fluorescence intensity of each partition as a function of temperature, and calculated measured T-M values from each partition. Finally, we created a 3-D map of the dPCR chip with the measured T-M as the parameter. Even when the actual T-M of the PCR solution was constant, the measured T-M 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 T-M as a temperature sensor. Among the non-contact temperature measurement methods, the proposed T-M-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 T-M 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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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 mu L/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 (T-M). We then captured fluorescent images of the chip when it was heated from 70 to 99 degrees C, plotted the fluorescence intensity of each partition as a function of temperature, and calculated measured T-M values from each partition. Finally, we created a 3-D map of the dPCR chip with the measured T-M as the parameter. Even when the actual T-M of the PCR solution was constant, the measured T-M 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 T-M as a temperature sensor. Among the non-contact temperature measurement methods, the proposed T-M-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 T-M 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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

30101 - Human genetics

Projekt

<a href="/cs/project/LTACH19005" target="_blank" >LTACH19005: Vysoce přesný systém digitální polymerázové řetězové reakce pro detekci cfDNA pro neinvazivní prenatální testování (NIPT</a><br>

Návaznosti

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

RSC Advances [online]

ISSN

2046-2069

e-ISSN

2046-2069

Svazek periodika

12

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

8

Strana od-do

2375-2382

Kód UT WoS článku

000743169000001

EID výsledku v databázi Scopus

2-s2.0-85123910148