Gold nanoparticle-based immunoassay for the detection of bifenthrin in vegetables

ABSTRACT

We have developed a sensitive and rapid gold nanoparticle-based immunochromatographic strip (GNP-ICS) for the detection of bifenthrin (BF) using an anti-BF monoclonal antibody (mAb). When used in indirect competitive enzyme-linked immunosorbent assay (icELISA), the specific anti-BF mAb (3D1) had a half-maximal inhibitory concentration (IC₅₀) and limit of detection (LOD) of 59 and 15 ng mL⁻¹ respectively. Additionally, its cross-reactivity (CR) with other pyrethroids was negative. The developed GNP-ICS assay based on the GNP-labelled mAb was specific and sensitive for determining BF, with a cut-off value of 1,000 ng mL⁻¹, and a visual LOD (vLOD) value of 50 ng mL⁻¹. Furthermore, the developed icELISA and GNP-ICS were applied with a simple pre-treatment to determine BF-spiked vegetable samples, and the recoveries were validated using gas chromatography-mass spectrometry (GC-MS). The results revealed that the developed GNP-ICS was reliable for the detection of BF in practical samples.

GRAPHICAL ABSTRACT

KEYWORDS:

• Gold nanoparticle-based immunochromatographic assay
• monoclonal antibody
• bifenthrin
• vegetables

Disclosure statement

No potential conflict of interest was reported by the author(s).

Supplementary material

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Additional information

Funding

This work is financially supported by National Key R&D Program [2019YFC1605101].