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10.1016/j.bios.2020.112356

http://scihub22266oqcxt.onion/10.1016/j.bios.2020.112356
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32510339!ä!32510339

suck abstract from ncbi


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pmid32510339      Biosens+Bioelectron 2020 ; 165 (ä): 112356
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  • Homogeneous circle-to-circle amplification for real-time optomagnetic detection of SARS-CoV-2 RdRp coding sequence #MMPMID32510339
  • Tian B; Gao F; Fock J; Dufva M; Hansen MF
  • Biosens Bioelectron 2020[Oct]; 165 (ä): 112356 PMID32510339show ga
  • Circle-to-circle amplification (C2CA) is a specific and precise cascade nucleic acid amplification method consisting of more than one round of padlock probe ligation and rolling circle amplification (RCA). Although C2CA provides a high amplification efficiency with a negligible increase of false-positive risk, it contains several step-by-step operation processes. We herein demonstrate a homogeneous and isothermal nucleic acid quantification strategy based on C2CA and optomagnetic analysis of magnetic nanoparticle (MNP) assembly. The proposed homogeneous circle-to-circle amplification eliminates the need for additional monomerization and ligation steps after the first round of RCA, and combines two amplification rounds in a one-pot reaction. The second round of RCA produces amplicon coils that anneal to detection probes grafted onto MNPs, resulting in MNP assembly that can be detected in real-time using an optomagnetic sensor. The proposed methodology was applied for the detection of a synthetic complementary DNA of SARS-CoV-2 (severe acute respiratory syndrome coronavirus 2, also known as 2019-nCoV) RdRp (RNA-dependent RNA polymerase) coding sequence, achieving a detection limit of 0.4 fM with a dynamic detection range of 3 orders of magnitude and a total assay time of ca. 100 min. A mathematical model was set up and validated to predict the assay performance. Moreover, the proposed method was specific to distinguish SARS-CoV and SARS-CoV-2 sequences with high similarity.
  • |Betacoronavirus/*isolation & purification[MESH]
  • |Biosensing Techniques/*instrumentation/methods[MESH]
  • |COVID-19[MESH]
  • |Coronavirus Infections/*diagnosis[MESH]
  • |DNA, Complementary/*analysis[MESH]
  • |Equipment Design[MESH]
  • |Feasibility Studies[MESH]
  • |Humans[MESH]
  • |Limit of Detection[MESH]
  • |Magnetics/instrumentation/methods[MESH]
  • |Magnetite Nanoparticles/chemistry[MESH]
  • |Nucleic Acid Amplification Techniques/*instrumentation/methods[MESH]
  • |Pandemics[MESH]
  • |Pneumonia, Viral/*diagnosis[MESH]


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