Immunoassay Development for the Class-Specific Assay for Types I and II Pyrethroid Insecticides in Water Samples
作者:Qi Zhang、Wen Zhang、Xiuping Wang、Peiwu Li
DOI:10.3390/molecules15010164
日期:——
Five generic haptens of pyrethoid insecticides, which were classified as three types, were designed and synthesized: the first (hapten 1) is for type I pyrethroids without a cyano group, the second (hapten 2 and XQ) for type II pyrethroids with a cyano group, and the third (hapten 4 and 5) for both types of pyrethroids with loss of the ester group. The hapten structures were confirmed by MS and 1H-NMR. Hapten 1 and 2 were conjugated with BSA respectively and haptens 1-5 were conjugated with OVA. Four polyclonal antisera were raised against BSA conjugates including a mixture conjugate, and twenty antibody/coating conjugate combinations were selected for studies of assay sensitivity and specificity for pyrethroids. The study revealed the best combination, which showed equal high sensitivities (I50 is around 0.02 μg mL-1) to both types of pyrethroids. The immunity results suggest that, with a mixture conjugates, a polyclonal antibody against a group of insecticides can be prepared for multi-residue assays.
我们设计并合成了五种拟除虫菊酯类杀虫剂的通用触媒(分为三类):第一类(触媒 1)适用于不含氰基的 I 型拟除虫菊酯,第二类(触媒 2 和 XQ)适用于含氰基的 II 型拟除虫菊酯,第三类(触媒 4 和 5)适用于失去酯基的两种拟除虫菊酯。单体结构已通过 MS 和 1H-NMR 得到确认。单体 1 和 2 分别与 BSA 共轭,单体 1-5 与 OVA 共轭。针对 BSA 共轭物(包括一种混合共轭物)培养了四种多克隆抗体,并选择了 20 种抗体/包被共轭物组合,用于研究拟除虫菊酯的检测灵敏度和特异性。研究结果表明,最佳组合对两种除虫菊酯的敏感性相当高(I50 约为 0.02 μg mL-1)。免疫结果表明,使用混合共轭物可以制备出针对一组杀虫剂的多克隆抗体,用于多残留检测。