| Abstract |
Tea and yerba mate are traditional beverages prepared through the infusion of leaves of Camellia sinensis and Ilex paraguariensis, respectively. During this process, the leaching of pesticides onto the beverage, such as endosulfan, may occur. In this study, a bar adsorptive microextraction (BA mu E) method prior to large gas chromatography mass spectrometry analysis was developed to analyze alpha- and beta-endosulfan in teas and yerba mate infusions. Different sorbent coatings for 134E were compared and the hydrophilic-lipophilic balanced polymer showed the best selectivity for endosulfan isomers. The method was validated providing good recoveries (varying from 80.4 +/- 1.8 to 108 +/- 4.9\%) and linearities (r(2) > 0.99), limits of detection from 8.0 to 4.0 mu g kg(-1) and limits of quantification from 40 to 20 mu g kg(-1) for alpha- and beta-endosulfan, respectively. The application of the method in the analysis of real samples showed all free of endosulfan at the limit of detection of the analytical method. |
