Capability of novel fluorescence DNA-conjugated CdTe/ZnS quantum dots nanoprobe for COVID-19 sensing.
Spectrochim Acta A Mol Biomol Spectrosc
; 269: 120702, 2022 Mar 15.
Article
in English
| MEDLINE | ID: covidwho-1559881
ABSTRACT
Urgent identification of COVID-19 in infected patients is highly important nowadays. Förster or fluorescence resonance energy transfer (FRET) is a powerful and sensitive method for nanosensing applications, and quantum dots are essential materials in FRET-based nanosensors. The QDs are conjugated to DNA or RNA and used in many applications. Therefore, in the present study, novel fluorescence DNA-conjugated CdTe/ZnS quantum dots nanoprobe designed for detection of Covid-19 after extracting their RNA from saliva of hesitant people. For achieving this purpose, the water-soluble CdTe/ZnS QDs-DNA prepared via replacing the thioglycolic acid (TGA) on the surface of QDs with capture DNA (thiolated DNA) throw a ligand-exchange method. Subsequently, by adding the different concentrations of complementary (target DNA) in a mixture of quencher DNA (BHQ2-labeled DNA) and the QDs-DNA conjugates at different conditions, sandwiched hybrids were formed. The results showed that the fluorescence intensity was decreased with increasing the concentration of target DNA (as a positive control). The linear equation and regression (Y = 40.302 X + 1 and R2 = 0.98) were obtained by using the Stern-Volmer relationship. The Limit of detection (LOD) was determined 0.000823 µM. The achieved results well confirm the outcomes of the RT-PCR method in real samples.
Keywords
Full text:
Available
Collection:
International databases
Database:
MEDLINE
Main subject:
Cadmium Compounds
/
Quantum Dots
/
COVID-19
Type of study:
Diagnostic study
Limits:
Humans
Language:
English
Journal:
Spectrochim Acta A Mol Biomol Spectrosc
Journal subject:
Molecular Biology
Year:
2022
Document Type:
Article
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