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Ultrasensitive chemiluminescence biosensors using nucleic acid-functionalized silver-cysteine nanowires as signal amplifying labels

Abstract

Ultrasensitive chemiluminescent (CL) sensors for biomolecules (DNA and proteins) have been developed adopting DNA-functionalized silver–cysteine hybrid nanowires (p-SCNWs) as signal amplifying labels. The sensing is established from a sandwich-type DNA hybridization, where the target DNA strands are initially hybridized to the capture DNA located at paramagnetic microspheres (PMs) and subsequently hybridized to p-SCNWs functionalized by signal DNA probe. After magnetic separation, the p-SCNWs on the hybrids were completely decomposed by HNO3 to release numerous silver ions. The powerful catalysis of silver ions toward the redox reaction of K2S2O8-Mn2+-H3PO4 causes the generation of KMnO4 that is capable of oxidizing luminol at high pH, triggering an amplified chemiluminescent signal emission. The sensing combines the extraordinary sensitivity of the catalytic chemiluminescent technology and amplifying strategy via releasing large quantities of silver ions as catalyst from each hybrid, enabling the assay of target DNA strands at a concentration as low as 0.34 fM. The CL signals associated with single-base pair mismatched DNA strands and non-complementary DNA strands are able to be discriminated well from the CL signal related to the complementary DNA hybridization. Likewise, the combination of p-SCNWs functionalized with aptamer and PMs/aptamer/thrombin complex allowed the chemiluminescent sensing of thrombin with a low limit of detection corresponding to 0.17 pM.

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Publication details

The article was received on 25 Dec 2017, accepted on 07 Feb 2018 and first published on 08 Feb 2018


Article type: Paper
DOI: 10.1039/C7AN02085F
Citation: Analyst, 2018, Accepted Manuscript
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    Ultrasensitive chemiluminescence biosensors using nucleic acid-functionalized silver-cysteine nanowires as signal amplifying labels

    W. Chen, Y. Chen, M. Wang and Y. Chi, Analyst, 2018, Accepted Manuscript , DOI: 10.1039/C7AN02085F

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