© Versita Sp. z o.o. Received 15 March 2010; Accepted 8 June 2010 Keywords: Tocopherols • Solid phase extraction • Porous polymers • Vegetable oils • Capillary gas chromatographyIn this study we present the solid phase extraction selectivity of tocopherols from vegetable oils using four porous polymers (Porapak P, Porapak Q, Porapak QS, Porapak N). The tocopherols elution from SPE cartridges was performed using several hexanes:ethyl acetate mixtures (100:0, 95:5, 90:10, 85:15, v/v). Tocopherols (α, γ and δ-tocopherol) were analyzed by gas chromatography without any derivation steep. The amount of NaOH used for triglyceride removal was optimized. Particularly liquid-liquid and solid phase extraction methods for the extraction of tocopherols from vegetable oils were compared. The results confirmed that porous polymers represent promising SPE alternatives for the extraction of tocopherols from oils.

The present paper presents the comparative results of the organochlorine pesticide contamination of three types of sour cream having a fat content of 10%, 15% and 25%, gathered in two different periods of time, on the territory of the Bihor County. The purified fat extract has been submitted to qualitative and quantitative determinations through the gas chromatography method, using a complex standard with 20 compounds. The results aimed at the determination of the OCP incidence under sanitary veterinary surveillance [11] and the concentration for the compounds identified positively. The values of the maximum admitted concentrations have been exceeded, consistently, for Endrin and Endosulfan. However there is no real direct mathematic correlation with the fat percentage of the tested samples.

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The studied nonfatty matrice content was made of concentrated fodder mixture. To determine the organochlorines pesticides, were used: a GC-2010 gas chromatograph equipement with an electron capture detection (ECD) and a RESTEK model capillary chromatographic column (phase RTx-5, with 0,4 µm thick film layer, 20 m length and inside diameter of 0,18 mm). Before the GC injection, the pesticides samples were extracted, purified, eluted and concentrated.