Abdalla Nashwa S, E Amr Abd El-Galil, S M El-Tantawy Aliaa, A Al-Omar Mohamed, H Kamel Ayman, Khalifa Nagy M
Department of Chemistry, Faculty of Science, Ain Shams University, Abbasia 11566, Cairo, Egypt.
Pharmaceutical Chemistry Department, Drug Exploration & Development Chair (DEDC), College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia.
Polymers (Basel). 2019 Sep 19;11(9):1526. doi: 10.3390/polym11091526.
Screen-printed ion-selective electrodes were designed and characterized for the assessment of cyromazine (CYR) pesticide. A novel approach is to design tailor-made specific recognition sites in polymeric membranes using molecularly imprinted polymers for cyromazine (CR) determination (sensor I). Another sensor (sensor II) is the plasticized PVC membrane incorporating cyromazine/tetraphenyl borate ion association complex. The charge-transfer resistance and water layer reached its minimal by incorporating Polyaniline (PANI) solid-contact ISE. The designed electrodes demonstrated Nernstain response over a linear range 1.0 × 10-5.2 × 10 and 1.0 × 10-5.7 × 10 M with a detection limit 2.2 × 10 and 8.1 × 10 M for sensors I and II, respectively. The obtained slopes were 28.1 ± 2.1 (r = 0.9999) and 36.4 ± 1.6 (r = 0.9991) mV/decade, respectively. The results showed that the proposed electrodes have a fast and stable response, good reproducibility, and applicability for direct measurement of CYR content in commercial pesticide preparations and soil samples sprayed with CYR pesticide. The results obtained from the proposed method are fairly in accordance with those using the standard official method.
设计并表征了丝网印刷离子选择性电极，用于嘧菌环胺（CYR）农药的评估。一种新方法是使用分子印迹聚合物在聚合物膜中设计定制的特异性识别位点来测定嘧菌环胺（CR）（传感器I）。另一种传感器（传感器II）是含有嘧菌环胺/四苯基硼酸根离子缔合络合物的增塑PVC膜。通过引入聚苯胺（PANI）固体接触离子选择性电极，电荷转移电阻和水层达到最小值。所设计的电极在1.0×10⁻⁵至2×10⁻⁵和1.0×10⁻⁵至7×10⁻⁵M的线性范围内表现出能斯特响应，传感器I和II的检测限分别为2.2×10⁻⁶和8.1×10⁻⁶M。获得的斜率分别为28.1±2.1（r = 0.9999）和36.4±1.6（r = 0.9991）mV/十倍浓度变化。结果表明，所提出的电极具有快速稳定的响应、良好的重现性，适用于直接测量商业农药制剂和喷洒了CYR农药的土壤样品中的CYR含量。所提出方法获得的结果与标准官方方法获得的结果相当一致。
