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- Title
An impedimetric immunosensor based on chitosan–Au nanoparticles-reduced graphene oxide nanosheet composite modified PG electrode for detection of brain natriuretic peptide.
- Authors
Dahiya, Twinkle; Sharma, Minakshi; Rathee, Ravina; Pundir, C. S.; Rana, J. S.
- Abstract
An ultrasensitive impedimetric immunosensor was developed to detect brain natriuretic peptide (BNP) for early diagnosis of heart failure. To construct this immunosensor, anti-BNP antibodies were immobilized covalently onto nanocomposite of chitosan–Au nanoparticles and reduced graphene oxide nanosheets (CHIT-Au@rGONs) electrodeposited onto pencil graphite electrode. This approach impedes charge transfer resistance (Rct) value proportionally to the BNP captured by antigen–antibody interactions. The observed Rct values by this immunosensor, were correlated with linear concentrations of BNP in the range, 1 × 10–2 to 1 × 103 pg/mL, with a limit of detection of 12 pg/mL and limit of quantification of 36.3 pg/mL. The immunosensor detected BNP in spiked human sera. The analytic recovery of added BNP in human sera was 97.04%. The present method was fairly consistent with commercial approach. The working electrode was stored for 2 months in cold. BSA-IgG had no interference in the electrode activity showing its high specificity for BNP. This novel approach provided a new POC-diagnostics, as direct sample measurements are easier and more efficient by this immunosensor compared to existing immunosensors.
- Subjects
BRAIN natriuretic factor; GRAPHITE oxide; GRAPHENE oxide; ELECTRODES; CHARGE transfer
- Publication
3 Biotech, 2023, Vol 13, Issue 8, p1
- ISSN
2190-572X
- Publication type
Article
- DOI
10.1007/s13205-023-03704-x