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Voltammetric detection of vitamin D employing Au-MoS2 hybrid as immunosensing platform

ABSTRACT: A voltammetric immunosensor based on molybdenum sulphide (MoS2) and gold nanoparticles (Au NPs) for the determination of 25-hydroxy vitamin D3 (25(OH)D3) is reported. Anti-vit D (Ab-25(OH)D3) was immobilized onto the cysteamine-modified MoS2 and Au NPs which were deposited onto a fluoride tin oxide (FTO) electrode (Ab/Cys/Au/MoS2/FTO). The MoS2 sheets were prepared by hydrothermal method followed by an in situ growth of Au film onto the MoS2/FTO surface. Self-assembled monolayer (SAM) of cysteamine was synthesized onto the Au/MoS2/FTO which acts as a linker to covalently bind Ab-25(OH)D3. The Ab-25(OH)D3-immobilized Cys/Au/MoS2/FTO was used to detect 25(OH)D3 using differential pulse voltammetry. The electrochemical system provided an anodic peak current at a potential of +0.21 V vs. Ag/AgCl (satd. KCl) of ferricyanide/ferrocyanide redox couple. The detection principle relies on the inhibition of electron transfer at the electrode surface owing to the hindrance caused by the formation of immune complex between Ab-25(OH)D3 and 25(OH)D3. The immunosensor shows linear response from 1 pg mL−1 to 100 ng mL−1 25(OH)D3 and a sensitivity of 189 μA [log (pg mL−1)]−1 cm−2 along with a low limit of detection (LOD) of 0.38 pg mL−1. The immunosensor is highly selective towards 25(OH)D3 and presented a long shelf life of 28 days. Also, the immunosensor exhibits satisfactory performance towards spiked human serum samples with recovery between 95.1 and 102% (RSD 1.15–3.22%).

Supplementary Information

The online version contains supplementary material available at 10.1007/s00604-021-04862-6.

SUBMITTER: Kaur A

PROVIDER: S-EPMC8176887 | biostudies-literature |

REPOSITORIES: biostudies-literature

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