Ratiometric fluorescent sensing carbendazim in fruits and vegetables via its innate fluorescence coupling with UiO-67

Abstract

A ratiometric fluorescent sensor was facilely fabricated using innate fluorescence of carbendazim (MBC) and fluorescent UiO-67 to sensitively and selectively detect MBC in food matrixes. The innate fluorescence of MBC provided a signal at 311 nm (F₃₁₁), and the fluorescent UiO-67 at 408 nm (F₄₀₈) could recognize MBC through π-π stacking inducing fluorescent quenching relied on photoelectron transfer (PET). The ratio (F₃₁₁/F₄₀₈) of the fluorescence enhancement of MBC and the quenching of UiO-67 linearly responded to the MBC concentrations of 0-47.6 μmol/L with a low limit of detection (LOD) of 3.0 × 10^-3 μmol/L. The reverse response signals of the sensor enhanced the sensitivity toward MBC and presented remarkable anti-interference capability in complex matrices. The as-prepared sensor was applied to detect MBC residues in apple, cucumber and cabbage, obtaining satisfactory accuracy and precision with the recovery of 90.82-103.45% and RSDs of lower than 3.03%.

Keywords: 1,4-Biphenyldicarboxylic acid (PubChem CID: 67437721); Acetic acid (PubChem CID: 176); Acetonitrile (PubChem CID: 6342); Carbendazim; Carbendazim (PubChem CID: 25429); Food safety; Formic acid (PubChem CID: 284); Fructose (PubChem CID: 5984); Imidacloprid (PubChem CID: 86287518); L(+)-Cysteine (PubChem CID: 5862); Lysine (PubChem CID: 5962); MOFs; N, N-dimethylformamide (PubChem CID: 6228); Pesticide; Ratiometric fluorescence; Sodium chloride (PubChem CID: 5234); Thiophanate-methyl (PubChem CID: 3032791); Vitamin C (PubChem CID: 54670067); Zinc sulfate (PubChem CID: 24424); Zircomiun tetrachloride (PubChem CID: 9856075).