Abstract
In this study, the efficiency of two detectors—variable wavelength detector (VWD) and fluorescence detector (FLD)—in a liquid chromatograph to quantify azoxystrobin in water was compared. For this, a method was developed in a HPLC-VWD-FLD system using extraction by modified QuEChERS. The detection of azoxystrobin by fluorescence was possible using only a solvent effect, considering that azoxystrobin does not naturally fluoresce. Analytical curves were constructed using matrix-matched calibration, where a low matrix effect was verified in both detectors. In the linearity analysis of the analytical curves, the values of coefficient of determination found for the detectors were 0.9989 and 0.9983 for VWD and FLD, respectively. The relative standard error for the VWD detector was 6.96%, while for the fluorescence detector, it was 5.49%. The limit of detection (LOD) and the limit of quantification (LOQ) were, respectively, 0.33 and 0.68 mg L−1 (VWD) and 0.18 and 0.37 mg L−1 (FLD). The QuEChERS method, originally developed for the extraction of pesticides in food, was adapted for the extraction of azoxystrobin in water, demonstrating efficiency in the process, with precision values lower than 20% and accuracy between 83.58 and 112.88%, within the criteria established by MAPA and Document Nº SANTE/11312/2021. Therefore, it is concluded that both detectors are suitable for the analysis of azoxystrobin in water; however, there is a greater sensitivity for the fluorescence detector, since lower detection and quantification limit values were observed, in addition to a lower standard relative error (RSE).
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Acknowledgements
The authors are grateful to the Fundação Cearense de Apoio ao Desenvolvimento—BPI/FUNCAP (Grant number BP4-00172-00105.01.00/20) for financial support of this research.
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HdOG: conceptualization, methodology, formal analysis, investigation, writing—original draft, writing—review and editing. ECLdSB: writing—original draft, investigation. CRFdS: formal analysis, investigation. RdSC: methodology, formal analysis. CdOdS: formal analysis, investigation. LCCdO: resources, data curation. JGMdC: resources, visualization, supervision. RFdN: writing—review and editing, validation, project administration. RNPT: conceptualization, supervision, writing—review and editing, visualization, project administration, funding acquisition.
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de Oliveira Gomes, H., da Silva Bento, E.C.L., dos Santos, C.R.F. et al. Comparative Study Between VWD and FLD Detector in HPLC System for Azoxystrobin Quantification in Water. Chromatographia 86, 605–615 (2023). https://doi.org/10.1007/s10337-023-04274-z
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DOI: https://doi.org/10.1007/s10337-023-04274-z