Dong T, Sun J, Liu B, Zhang Y, Song Y, Wang S. Development of a sensitivity-improved immunoassay for the determination of carbaryl in food samples.
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2010;
90:1106-1112. [PMID:
20393990 DOI:
10.1002/jsfa.3917]
[Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
BACKGROUND
With the aim of developing a highly sensitive immunoassay for carbaryl, a hapten which had high similarity to carbaryl was synthesised using a safer and more practical approach. After it was conjugated to horseradish peroxidase, direct competitive heterologous enzyme-linked immunosorbent assay (CD-ELISA) was optimised and characterised. The assay performance conditions were investigated in details. Enhanced chemiluminescence ELISA (ECL-ELISA) was also used in preliminary studies.
RESULTS
The assay obtained an IC(50) value (the concentration causing 50% inhibition) of 2 microg kg(-1), which was 12-fold more sensitive than previous results of homologous CD-ELISA. In ECL-ELISA, the IC(50) was further decreased 10-fold to 0.2 microg kg(-1). The CD-ELISA developed was applicable for broad conditions, and could be applied on various food samples with a more convenient pre-treatment. Average recoveries were in a range of 88.3-101.7%. The results correlated well with those obtained using high-performance liquid chromatography (HPLC) analysis (R(2) = 0.989).
CONCLUSION
The ELISA developed was a great improvement in the determination of carbaryl, showing that the immunoassay developed was a simple, rapid and efficient method that was reliable for the detection of carbaryl and suitable for rapid quantitative or qualitative determination in food samples.
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