Influence of the Hapten Design on the Development of a Competitive ELISA for the Determination of the Antifouling Agent Irgarol 1051 at Trace Levels
作者:Berta Ballesteros、Damià Barceló、Francisco Sanchez-Baeza、Francisco Camps、María-Pilar Marco
DOI:10.1021/ac980241d
日期:1998.10.1
Enzyme-linked immunosorbent assays (ELISAs) with a high detectability have been developed for determination of the antifouling agent Irgarol 1051. The features of the resulting assays have been rationalized by using molecular mechanic calculations (MM2+) to correlate the chemical structure of different immunizing haptens and the corresponding avidities of the obtained antisera. The ability of Irgarol 1051 to compete for the antibody binding sites with 11 horseradish peroxidase enzyme tracers, differing in the chemical structures of the hapten, has been investigated. The present paper demonstrates that high-quality antibodies and, therefore, immunoassays reaching very low detection limits could be predicted by molecular modeling studies of the analyte conformations and of the immunizing haptens' geometries, hydrogen-bonding capabilities, and electronic distributions. Two of the ELISAs obtained have been optimized to obtain reproducible immunoassays. The dynamic ranges of both assays are between 30 and 200 ng/L, and the limits of detection are ∼16 ng/L. The reported immunoassays have been evaluated and validated by analyzing spiked and real seawater samples. Irgarol 1051 has been found to be present in two of the geographical locations analyzed at concentration levels dependent on the time of year. The analytical results obtained with these immunoassays have been validated by chromatographic methods.
针对防污剂Irgarol 1051的高检测能力酶联免疫吸附测定(ELISA)已被开发出来。通过使用分子力学计算(MM2+)将不同免疫半抗原的化学结构与所得抗血清的亲和力相关联,合理化了所得到的测定方法的特性。已研究了Irgarol 1051与11种结构中半抗原不同的辣根过氧化物酶酶标记物竞争抗体结合位点的能力。目前的研究表明,通过对分析物构象和免疫半抗原的几何形状、氢键能力及电子分布进行分子建模研究,可以预测高质量的抗体,从而得到检测限非常低的免疫测定方法。两个ELISA测定方法已得到优化,以获得可重复的免疫测定方法。两种测定方法的动态范围均在30至200 ng/L之间,检测限约为16 ng/L。通过分析加标海水样品和真实海水样品,对所报道的免疫测定方法进行了评估和验证。在分析的两个地理位置中,Irgarol 1051的存在浓度水平随季节而变化。通过色谱法对这些免疫测定方法的分析结果进行了验证。