An Indirect Competitive Fluorescence Immunoassay for Determination of Dicyclohexyl Phthalate in Water Samples |
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Authors: | Mingcui Zhang and Yali Sheng |
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Institution: | (1) Anhui Key Laboratory of Chemo-Biosensing, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000, People’s Republic of China |
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Abstract: | A sensitive and specific indirect competitive fluorescence immunoassays (FIA) has been developed for the quantitative determination
of dicyclohexyl phthalate (DCHP) using an antigen-coated plate format. The polyclonal antibodies raised against dicyclohexyl
4-amino phthalate conjugated to bovine serum albumin (BSA) by the amino diazotization linkage method. Antiserum with a sufficiently
high titer was generated in rabbits and fluorescein isothiocyanate (FITC) was used as sensitive labels to construct the fluorescence
immunoassay (FIA) for measurement of targeted compounds. Under optimized FIA condition, the quantitative working range was
from 0.1 to 200 μg L−1 with a limit of detection of 0.05 μg L−1. Other similar phthalate compounds do not interfere significantly in the analysis using this immunoassay technique, and the
cross-reactivity rates were less than 10%. Four kinds of water samples (tap water, lake water, river water and leachate) had
been detected in this assay, the recovery was 91.3–107.8%. The proposed fluorescence immunoassay turned out to be a powerful
tool for monitoring of dicyclohexyl phthalate in water samples at trace level. |
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