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Frontiers of Environmental Science & Engineering

ISSN 2095-2201

ISSN 2095-221X(Online)

CN 10-1013/X

Postal Subscription Code 80-973

2018 Impact Factor: 3.883

Front Envir Sci Eng Chin    2011, Vol. 5 Issue (3) : 409-416    https://doi.org/10.1007/s11783-011-0349-8
RESEARCH ARTICLE
Preparation of hapten-specific monoclonal antibody for cadmium and its ELISA application to aqueous samples
Huan HE1, Bo TANG2, Cheng SUN1(), Shaogui YANG1, Weijuan ZHENG2(), Zichun HUA2
1. The State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China; 2. The State Key Laboratory of Pharmaceutical Biotechnology, School of Life Science, Nanjing University, Nanjing 210093, China
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Abstract

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.

Keywords cadmium      hapten      monoclonal antibody      enzyme-linked immunosorbent assay (ELISA)     
Corresponding Author(s): SUN Cheng,Email:envidean@nju.edu.cn; ZHENG Weijuan,Email:wjzheng@nju.edu.cn   
Issue Date: 05 September 2011
 Cite this article:   
Cheng SUN,Shaogui YANG,Weijuan ZHENG, et al. Preparation of hapten-specific monoclonal antibody for cadmium and its ELISA application to aqueous samples[J]. Front Envir Sci Eng Chin, 2011, 5(3): 409-416.
 URL:  
https://academic.hep.com.cn/fese/EN/10.1007/s11783-011-0349-8
https://academic.hep.com.cn/fese/EN/Y2011/V5/I3/409
Fig.1  FT-IR spectra of IEDTA and Cd-IEDTA (molar ratio was 1∶1)
Fig.2  UV-Vis spectra of (a) BAS, Cd-IEDTA, and Cd-IEDTA-BSA; (b) KLH, Cd-IEDTA, and Cd-IEDTA-KLH
mouseOD of Cd-IEDTA-BSAOD of IEDTA-BSAdifference /%
11.1210.826+ 36
21.3021.142+ 14
30.7890.808- 3
41.1861.164+ 1
negative0.2110.221+ 4
Tab.1  Reactivity of serum from BALB/c mice injected with Cd-IEDTA-KLH to IEDTA-BSA and Cd-IEDTA-BSA
Fig.3  Representative results of hybirdoma screening by competitive ELISA
Fig.4  Inhibition of different concentration of EDTA to supernatant of antibody 3E2
Fig.5  Standard inhibition curve for cadmium obtained by monoclonal antibody 3E2. The plots were fitted by the sigmoidal curve
metal ionsIC50cross-reactivity rate
Cd2+9.88 ng·mL-1100%
Pb2+>50 μg·mL-1No
Al3+>50 μg·mL-1No
Mg2+>50 μg·mL-1No
Ca2+>50 μg·mL-1No
Cr3+>50 μg·mL-1No
Zn2+>10 μg·mL-1<0.10%
Ni2+>10 μg·mL-1<0.10%
Co2+>10 μg·mL-1<0.10%
Mn2+>5 μg·mL-1<0.20%
Cu2+>1 μg·mL-1<0.99%
Hg2+>1 μg·mL-1<0.99%
Tab.2  Cross-reactivity determined by competitive ELISA with other metal ions
concentration of cadmium/ (μg·L-1)intra-assay mean binding (B/B0)±SD /(CV %)inter-assay mean binding (B/B0)±SD /(CV %)
50019.3±0.02(1.5)18.9±0.4 (5.9)
10027.2±0.03(3.4)27.8±0.3(4.3)
1049.1±0.08(6.3)49.7±0.6 (7.4)
558.1±0.05(2.5)58.6±0.7 (3.2)
Tab.3  Precision of intra- and inter-assay of indirect competitive ELISA for cadmium (= 5)
spiked value/ (μg·L-1)ultrapure watertap waterTaihu Lake water
measured value/(μg·L-1)recovery/%measured value/(μg·L-1)recovery/%measured value/(μg·L-1)recovery/%
55.32106.44.8897.64.5691.2
1011.03110.39.8598.59.5395.3
5049.7499.548.9597.946.5793.1
10098.5298.597.4097.486.4186.4
Tab.4  Recovery of the immunoassay for cadmium in ultrapure, tap and Taihu Lake water ( = 5)
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