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Development and validation of high-performance liquid chromatography method for determination of some pesticide residues in table grape

100%

Velkoska-Markovska L. , Petanovska-Ilievska B. , Jankulovska M. S. , Ilievski U.

tom Vol. 30, no. 4

250--254

This study presents the development and validation of a new reversed-phase high-performance liquid chromatography (RP-HPLC) method for simultaneous determination of captan, folpet, and metalaxyl residues in table grape samples with ultraviolet–diode array detection (UV–DAD). Successful separation and quantitative determination of analytes was carried out on LiChrospher 60 RP-select B (250 × 4 mm, 5 μm) analytical column. Mixture of acetonitrile–0.1% formic acid in water (65:35, v/v) was used as a mobile phase, with flow rate of 1 mL/min, constant column temperature at 25 °C, and UV detection at 220 nm. The target residues were extracted with acetone by ultrasonication, followed by a cleanup using liquid–liquid extraction (LLE) and solid-phase extraction (SPE). The obtained values for multiple correlation coefficients (R2 > 0.90), relative standard deviation (RSD) of retention times, peak areas and heights (RSD ≤ 2.25%), and recoveries ranging from 90.55% to 105.40%, with RSD of 0.02% to 5.37%, revealed that the developed method has a good linearity, precision, and accuracy for all analytes. Hence, it is suitable for routine determination of investigated fungicides in table grape samples.

The effects of captan and captafol on different bacterial strains and on c-mitosis in V79 chinese hamster fibroblasts

84%

Rahden-Staron I. , Szumilo M. , Ziemkiewicz P.

1994

tom 41

nr 1

The mutagenic activity of captan and captafol was tested using Ames stzaiiis and strains showing an SOS response. Captafol was mutagenic in S. typhimurium strain TA102 (uvr+) and captan in strain TA104 (uvrB). Both captan and captafol elicit damages in DNA recognized by correndonuclease U, as shown by the repair teat, and induced the SOS repair system in E. coli PQ37 (uvrA) strain. Only captafol induced the SOS system in PQ35 (uvr+). The lack of induction of p-galactesidaac at nonpermissive temperature in E. coli MD332 (dnaCs uvrA) strain showed that neither chemical was able to produce DNA breaks. In V79 Chinese hamster fibroblasts higher induction of c-mitosis by captafol than by captan (22% and 15% over th* control, respectively) was accompanied by a higher decrease in nonprotein sulfhydryl groups, mainly GSH (41% and 77%, respectively). The content of protein sulfhydryl groups was decreased by either fungicide to a similar extent.

Pozostałości kaptanu, trifloksystrobiny, cyprodynilu i fludioksonilu w jabłkach i liściach po ich aplikacji przeciwko chorobom przechowalniczym

51%

Kurdziel A. , Sadlo S. , Szpyrka E.

nr 3

Studies on disappearance of captan, trifloxistrobin, cyprodinil and fludioxonil residues in fruits and leaves after their application against diseases were carried out. The initial deposits of cyprodinil and fludioxonil in fruits were on the levels 0.236±0.064 and 0.294±0.039 mg/kg, respectively, and disappeared more quickly than those of captan. However their residues during harvest were still significantly higher than 0.01 mg/kg. Quite similar behaviour was found to be in the case of trifloxistrobin initial deposits. Results of the studies indicated that the apples could not be used for baby food production.