Monoclonal Antibody-Based ELISAs for Part-per-Billion Determination of Polycyclic Aromatic Hydrocarbons: Effects of Haptens and Formats on Sensitivity and Specificity
作者:Kai Li、Rongliang Chen、Bitao Zhao、Mei Liu、Alexander E. Karu、Victoria A. Roberts、Qing X. Li
DOI:10.1021/ac980765d
日期:1999.1.1
As a first step toward developing sensitive enzyme-linked immunosorbent assays (ELISAs) for multianalyte detection of polycyclic aromatic hydrocarbons (PAHs), haptens with different lengths of carboxylic acid spacers at various positions were derived from naphthalene, fluorene, anthracene, phenanthrene, pyrene, fluoranthene, chrysene, and benzo[a]pyrene (BaP). These haptens were coupled with bovine serum albumin (BSA) to form competitor conjugates. All of these haptens were recognized to different extents by monoclonal antibodies (MAbs) 4D5 and 10C10 originally derived by Gomes and Santella (Chem. Res. Toxicol. 1990, 3, 307−310). The most sensitive indirect ELISAs were obtained by coating wells with the least competitive conjugates. Direct ELISAs using horseradish peroxidase conjugates of pyrene and BaP were less sensitive. The MAbs bound BaP with spacers at either C1 or C6. The cross-reactivity profiles of the eight PAHs were different with each PAH−BSA conjugate used as coating antigen. The ELISA results for BaP closely correlated with those by gas chromatography (GC), but the detection limit of the ELISA was ∼150-fold more sensitive than that of GC, with 2−600 nM spike recoveries of 80−127% from human urine and canal and tap water.
作为开发灵敏的酶联免疫吸附测定法(ELISA)以检测多环芳烃(PAHs)的第一步,我们从萘、芴、蒽、菲、芘、荧蒽、菊烯和苯并[a]芘(BaP)中提取出了在不同位置具有不同长度羧酸间隔的触媒。这些触媒与牛血清白蛋白(BSA)结合形成竞争共轭物。Gomes 和 Santella 最初研制的单克隆抗体(MAbs)4D5 和 10C10 可在不同程度上识别所有这些触媒(《化学研究与毒理学》,1990 年 3 期,307-310 页)。用竞争性最小的共轭物涂布孔,可获得灵敏度最高的间接 ELISA。使用芘和 BaP 的辣根过氧化物酶结合物进行直接 ELISA 的灵敏度较低。MAbs 在 C1 或 C6 处与带有间隔的 BaP 结合。八种多环芳烃的交叉反应谱与用作包被抗原的每种多环芳烃-BSA 结合物都不同。酶联免疫吸附法检测 BaP 的结果与气相色谱法(GC)的结果密切相关,但酶联免疫吸附法的检测限比气相色谱法灵敏 150 倍,在人体尿液、运河水和自来水中 2-600 nM 的峰值回收率为 80-127%。