Abstract
Specific polyclonal antibodies against s-triazine herbicides were obtained by preparing immunogens coupling home-synthesized haptens derivatives of simazine (6-chloro-N-ethyl-N′-ethyl-1,3,5-triazine-2,4-diamine) to lysine groups of hemocyanin from keyhole limpets and bovine serum albumin carrier proteins. Three highly sensitive rabbit antisera were obtained and evaluated with a battery of six enzyme tracers derived from triazine structures in an optimized ELISA format. The antiserum As8 and the HRP-2f tracer, which yield the best assay sensitivity for simazine (detection limit 0.11 ± 0.02 μg L−1, IC50 0.88 ± 0.04 μg L−1), were applied to the development of a sensitive flow-through immunoassay for the analysis of this herbicide. The automated assay was based on a direct competitive immunosorbent assay and fluorescence detection. The optimized method presents an IC50 value of 0.35 ± 0.04 μg L−1 with a detection limit of 1.3 ± 0.9 ng L−1 and a dynamic range from 0.010 to 7.5 μg L−1 simazine. The generic nature of the antiserum was shown by good relative cross-reactivities with other triazines such as atrazine (420%) or propazine (130%) and a lower response to terbutylazine (6.4%) and desethyl-atrazine (2.2%). No cross-reactivity was obtained for nonrelated pesticides such as 2,4-dichlorophenoxyacetic acid or linuron and the assay could be applied as a screening method for triazine herbicides. The total analysis time was 30 min per determination and the immunosensor could be reused for more than 150 cycles without significant loss of activity. The immunosensor has been successfully applied to the direct analysis of simazine in surface water samples at the nanogram per liter level. The results obtained by comparative analysis of the immunosensor with a chromatographic procedure for triazines showed a close correspondence.
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Abbreviations
- ACN:
-
acetonitrile
- ATR:
-
atrazine
- BSA:
-
bovine serum albumin
- CPGA:
-
controlled-pore glass covalently bound to protein A
- 2,4-D:
-
2,4-dichlorophenoxyacetic acid
- DAD:
-
diode-array detection
- ET:
-
enzyme tracer
- FIIA:
-
flow-injection immunoassay
- GC:
-
gas chromatography
- HPLC:
-
high-performance liquid chromatography
- HPPA:
-
3-(p-hydroxyphenyl)propanoic acid
- HRP:
-
horseradish peroxidase
- KLH:
-
hemocyanin from keyhole limpets
- MALDI:
-
matrix-assisted laser desorption ionization
- MS:
-
mass spectrometry
- NPD:
-
nitrogen–phosphorous detection
- PBS:
-
phosphate-buffered saline
- PBST:
-
phosphate-buffered saline plus 0.2% Tween 20
- RSD:
-
relative standard deviation
- SIM:
-
simazine
- SPE:
-
solid-phase microextraction
- SPFIA:
-
solid-phase fluorescence immnunoassay
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Acknowledgements
The authors thank the Madrid Community Government (reference S-0505/AMB/0374), the ESF, the ERDF and the Ministry of Science and Education (reference CTQ2006-15610-C02). S.H. thanks the Ministry of Science and Education for a predoctoral grant.
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Herranz, S., Ramón-Azcón, J., Benito-Peña, E. et al. Preparation of antibodies and development of a sensitive immunoassay with fluorescence detection for triazine herbicides. Anal Bioanal Chem 391, 1801–1812 (2008). https://doi.org/10.1007/s00216-008-1895-1
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DOI: https://doi.org/10.1007/s00216-008-1895-1