Saini K, Kaushal A, Gupta S, Kumar D. PlcA-based nanofabricated electrochemical DNA biosensor for the detection of
Listeria monocytogenes in raw milk samples.
3 Biotech 2020;
10:327. [PMID:
32656060 DOI:
10.1007/s13205-020-02315-0]
[Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Accepted: 06/23/2020] [Indexed: 02/07/2023] Open
Abstract
The electrochemical DNA biosensor has been developed for the detection of Listeria monocytogenes in raw milk samples. The electrochemical studies of the developed biosensor was recorded by cyclic voltammetry (CV) and electrochemical impedance (EI) using methylene blue (MB) and potassium ferricyanide K3Fe(CN)- 6 as redox indicators. The selectivity of the developed biosensor was demonstrated using complementary and mismatch oligonucleotide sequences. The sensitivity (S) of the developed sensor was recorded as 3461 (μA/cm2)/ng and limit of detection (LOD) was found to be 82 fg/6 µl with the regression coefficient (R 2) 0.941 using CV. The sensor was characterized by field emission scanning electron microscopy (FE-SEM). The electrode was found to be stable for six months, with only 10% loss in the initial CV current.
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