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%.

使用多菌灵的固有荧光（MBC）和荧光UiO-67可以方便地制造比例式荧光传感器，以灵敏地和选择性地检测食物基质中的MBC。MBC的固有荧光在311 nm（F ₃₁₁）处提供信号，并且408 nm（F ₄₀₈）的荧光UiO-67可以通过π-π堆叠识别MBC，从而诱导依赖于光电子转移（PET）的荧光猝灭。MBC的荧光增强比和UiO-67的猝灭之比（F ₃₁₁ / F ₄₀₈）对MBC浓度为0–47.6μmol/ L线性响应，最低检测限（LOD）为3.0×10 ^-3μmol/ L。传感器的反向响应信号增强了对MBC的灵敏度，并在复杂矩阵中表现出出色的抗干扰能力。所制备的传感器用于检测苹果，黄瓜和卷心菜中的MBC残留，获得令人满意的准确度和精密度，回收率90.82–103.45％，RSD低于3.03％。