Zheng Mingda, Wang Yingying, Wang Chenge, Wei Wei, Ma Shuang, Sun Xiaohan, He Jiang
College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China.
College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2018 Jun 5;198:315-321. doi: 10.1016/j.saa.2018.03.038. Epub 2018 Mar 13.
A simple and selective colorimetric sensor based on citrate capped silver nanoparticles (Cit-AgNPs) is proposed for the detection of Thiophanate-methyl (TM) with high sensitivity and selectivity. The method based on the color change of Cit-AgNPs from yellow to cherry red with the addition of TM to Cit-AgNPs that caused a red-shift on the surface plasmon resonance (SPR) band from 394nm to 525nm due to the hydrogen-bonding and substitution. The density functional theory (DFT) method was also calculated the interactions between the TM and citrate ions. Under the optimized conditions, a linear relationship between the absorption ratio (A/A) and TM concentration was found in the range of 2-100μM with correlation coefficient (R) of 0.988. The detection limit of TM was 0.12μM by UV-vis spectrometer. Moreover, the applicability of colorimetric sensor is successfully verified by the detection of TM in environmental samples with good recoveries.
提出了一种基于柠檬酸盐包覆银纳米颗粒（Cit-AgNPs）的简单且具有选择性的比色传感器，用于高灵敏度和高选择性地检测甲基硫菌灵（TM）。该方法基于向Cit-AgNPs中添加TM时，Cit-AgNPs的颜色从黄色变为樱桃红色，由于氢键和取代作用，表面等离子体共振（SPR）带从394nm红移至525nm。还采用密度泛函理论（DFT）方法计算了TM与柠檬酸根离子之间的相互作用。在优化条件下，发现吸光度比值（A/A）与TM浓度在2-100μM范围内呈线性关系，相关系数（R）为0.988。通过紫外可见光谱仪测得TM的检测限为0.12μM。此外，通过对环境样品中TM的检测及良好的回收率，成功验证了该比色传感器的适用性。
