
Preparation of hapten-specific monoclonal antibody for cadmium and its ELISA application to aqueous samples
Huan HE, Bo TANG, Cheng SUN, Shaogui YANG, Weijuan ZHENG, Zichun HUA
Front. Environ. Sci. Eng. ›› 2011, Vol. 5 ›› Issue (3) : 409-416.
Preparation of hapten-specific monoclonal antibody for cadmium and its ELISA application to aqueous samples
High-affinity and specific monoclonal antibodies against cadmium-ethylene diamine tetraacetic acid (EDTA) complex have been produced using the hybridoma technique. A hapten was synthesized and characterized by Fourier Transform Infrared Spectroscopy (FT-IR) and UV-Vis. Competitive enzyme-linked immunosorbent assay (ELISA) for quantitative detection of cadmium in aqueous sample was developed. The monoclonal antibody with high level of binding affinity for Cd-IEDTA-BSA and high specificity for soluble Cd-EDTA complex showed less than 0.99% cross-reactivity with other 11 metals. The limit of detection was 0.10 μg·L-1, and the effective linear range was 10-1–103 μg·L-1. The intra- and inter-assay coefficient variations were 1.5%–6.3% and 3.2%–7.4%, respectively. The spike recovery in different water samples were between 98.5% and 110.3%. The detection limit of this assay was well below the allowable concentration of cadmium (3 μg·L-1), and the working range was wider than that of other methods which showed the range of 2.19–86.38 and 0–103 μg·L-1. The competitive ELISA established in this paper was sensitive and accurate in the screening of cadmium in aqueous samples. The results will lay a solid foundation for construction of an immunoassay kit for cadmium.
cadmium / hapten / monoclonal antibody / enzyme-linked immunosorbent assay (ELISA)
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