Journal
TALANTA
Volume 249, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2022.123687
Keywords
SARS-CoV-2; Variantdelta; CRISPR-dCas9; Accurateidentification; Electrochemicalbiosensor
Categories
Funding
- National Natural Science Foundation of China [22174024, 21974028, 22174022, 22127806]
- Shanghai Scientific and Technological Innovation Action Plan [19441915600]
- Shanghai Agricultural Development project [2021-02-08-00-12-F00772]
- China National Post-doctoral Program for Innovative Talents [BX20200090]
- China Post-doctoral Science Foundation [2021M700806]
- Shanghai Post-doctoral Excellence Program [2020066]
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A highly selective and sensitive detection method has been developed to accurately identify the SARS-CoV-2 Delta variant. The assay has the advantages of rapidity, high sensitivity, good reproducibility, and the ability to differentiate between different SARS-CoV-2 variants, which has been validated in clinical samples.
Delta (B.1.617.2), a highly infectious variant of SARS-CoV-2, has been sweeping the world, and threatening the safety of human life seriously. It is urgent to develop a highly selective and sensitive assay to accurately identify the SARS-CoV-2 variant Delta. In this work, we constructed a graphene/CRISPR-dCas9 electrochemical biosensor to accurately identify SARS-CoV-2 variant Delta, where the signal was further amplified by embedded electro-chemical probe [Ru(phen)2dppz]BF4. This detection assay could be finished within 47 min totally, with the detection limit of 1.2 pM and good reproducibility with a C.V.% of 2.48% (n = 5). And the biosensor could selectively identify Delta among SARS-CoV-2 and other variants, including Alpha, Beta, Gamma. This assay was further validated by 26 real clinical samples, showing 100% clinical sensitivity and 100% clinical specificity, which provides a new direction for identifying other SARS-CoV-2 variants in the future.
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