Vojislava Bursić1, Gorica Vuković2, Dušan Marinković1, Magdalena Cara*, Tijana Zeremski3, željka jeličić-marinković4, Marija Zgomba1
1Faculty of Agriculture, University of Novi Sad, Department of Environmental and Plant Protection, Novi Sad, Serbia
2Institute of Public Health of Belgrade, Belgrade, Serbia
*Faculty of Agriculture and Environment, AUT, Department of Plant Protection, Tirana, Albania
3Institute of Field and Vegetable Crops, Novi Sad, Serbia
4Josip Juraj Strossmayer University in Osijek, Department of Biology, Osijek, Croatia
Pyriproxyfen is an insect growth regulator that affects the physiology of morphogenesis, reproduction and embryogenesis of insects. The molecule of pyriproxyfen bears little resemblance to endogenous insect juvenile hormone (JH), but it affects JH and ecdysteroid titers in a variety of arthropods. High-performance liquid chromatography with diode array (HPLC-DAD) method is a widely used method for the analyses of pyriproxyfen. Although the methods have been remarkably improved, tandem mass spectrometry (LC–MS/MS) systems with significant advantages have gradually replaced HPLC-DAD in many analyses. The aim of this study, was the evaluation of the two methods for linearity, limit of detection (LOD), limit of quantification (LOQ) selectivity and repeatability for the determination of pyriproxyfen in water solutions. Using HPLC-DAD the obtained LOD was 0.01 μg/ml with the LOQ of 0.03 μg/ml. The linearity was over 0.99 for the concentrations from 0.1 to 1.0 µg/ml with the repeatability RSD less than 11.7%. The LC-MS/MS method showed high reproducibility, as evident from the RSD values for intra-day and inter-day variability being 1.0–6.8% and 2.0–7.7%. The LC-MS/MS method exhibits linearity (R2>0.99) for the concentrations from 1.0 to 100.0 ng/ml with the repeatability RSD less than 12.7%. The obtained LOD and LOQ was 0.1 ng/ml and 1.0 ng/ml, respectively. The HPLC-DAD performed well in terms of various validation parameters, but showed a very high LOD and LOQ (considering low concentration level of pyriproxyfen used in mosquito treatment) compared to LC–MS/MS.
Keywords – HPLC-DAD, LC-MS/MS, pyriproxyfen, water solution