Abstract
Nanobodies are one-tenth the size of conventional antibodies and are naturally obtained from the atypical heavy-chain-only antibodies present in camelids. Their small size, high solubility, high stability, and strong resilience to organic solvents facilitate their use as novel analytical reagents in immunochemistry. In this study, specific nanobodies against pesticide carbofuran were isolated and characterized from an immunized library via phage display platform. We further established an indirect competitive enzyme-linked immunosorbent assay (ELISA) using nanobody Nb316 to detect carbofuran in vegetable and fruit samples. The results showed a half-maximal inhibitory concentration (IC50) of 7.27 ng/mL and a detection limit of 0.65 ng/mL. A simplified sample pretreatment procedure omitting the evaporation of organic solvent was used. The averaged recovery rate of spiked samples ranged between 82.3% and 103.9%, which correlated with that of standard UPLC–MS/MS method. In conclusion, a nanobody with high specificity for carbofuran was characterized, and a nanobody-based sensitive immunoassay for simple and rapid detection of carbofuran in real samples was validated.
Highlights
Carbofuran is a broad-spectrum insecticide widely used in a variety of agricultural crops to shorten the crop growth period and increase crop yields [1]
Carbofuran is highly toxic [3], and its use in agricultural products poses a potential hazard for human health and the environment [4]
The maximum residue limit (MRL) for carbofuran has been established under different legislations worldwide
Summary
Carbofuran is a broad-spectrum insecticide widely used in a variety of agricultural crops to shorten the crop growth period and increase crop yields [1]. Due to its high solubility, carbofuran is absorbed by plant roots and transported to various plant organs, especially the edge of leaves [2]. Carbofuran is highly toxic [3], and its use in agricultural products poses a potential hazard for human health and the environment [4]. The maximum residue limit (MRL) for carbofuran has been established under different legislations worldwide. In the case of Chinese cabbages, cucumbers, and oranges, the MRL is 0.02 mg/kg in China. It is necessary to detect carbofuran with high sensitivity and strong specificity
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