Fig. 1. Scheme of standard and improved method for pymetrozine analysis using the liquid-liquid extraction.
Fig. 2. Chromatography of pymetrozine in lemon or orange using hydromatrix method.
Fig. 3. Chromatography of pymetrozine in lemon or lime using liquid-liquid extraction method.
Fig. 4. Chromatography of pymetrozine in citrus fruits using improved liquid-liquid extraction method.
Table 1. Reproducibility of the standard method1) for pymetrozine analysis in orange
Table 2. Efficiency in each separation step of standard method1) according to the added volume of dichloromethane (DCM)
Table 4. Validation and reproducibility of the improved method for pymetrozine analysis in citrus fruits
Table 3. pH of citrus fruits extracts depending on the added volume of borax buffer and 1 N NaOH
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