Zhang Ruiting, Zhang Liyuan, Yu Runzhong, Wang Changyuan
College of Food Science, Heilongjiang Bayi Agricultural University, 5 Xinfeng Road, Daqing 163319, China.
College of Food Science, Heilongjiang Bayi Agricultural University, 5 Xinfeng Road, Daqing 163319, China.
Food Chem. 2023 Jul 1;413:135679. doi: 10.1016/j.foodchem.2023.135679. Epub 2023 Feb 11.
A highly sensitive fluorescent sensing system of novel carbon quantum dots nano-fluorescent probe based on corn stalks was established for the determination of methyl parathion by alkaline catalytic hydrolysis and inner filter effect mechanism. The carbon quantum dots nano-fluorescent probe was prepared from corn stalks using an optimized one-step hydrothermal method. The detection mechanism of methyl parathion was revealed. The reaction conditions were optimized. The linear range, sensitivity and selectivity of the method were evaluated. Under the optimal conditions, the carbon quantum dots nano-fluorescent probe exhibited high selectivity and sensitivity to methyl parathion, achieving a linear range of 0.005-14 µg/mL. The fluorescence sensing platform was applied to the detection of methyl parathion in rice samples, and the results showed that the recoveries range from 91.64 to 104.28 %, and the relative standard deviations were less than 4.17 %. The detection limit for methyl parathion in rice samples was 1.22 µg/kg, and the limit of quantitation (LOQ) was 4.07 µg/kg, which was very satisfactory.
基于玉米秸秆建立了一种高灵敏度的新型碳量子点纳米荧光探针荧光传感系统，用于通过碱性催化水解和内滤效应机制测定甲基对硫磷。采用优化的一步水热法从玉米秸秆制备碳量子点纳米荧光探针。揭示了甲基对硫磷的检测机理，优化了反应条件，评估了该方法的线性范围、灵敏度和选择性。在最佳条件下，碳量子点纳米荧光探针对甲基对硫磷表现出高选择性和灵敏度，线性范围为0.005 - 14 μg/mL。将该荧光传感平台应用于大米样品中甲基对硫磷的检测，结果表明回收率范围为91.64%至104.28%，相对标准偏差小于4.17%。大米样品中甲基对硫磷的检测限为1.22 μg/kg，定量限（LOQ）为4.07 μg/kg，结果非常令人满意。
