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Safety of Lebanese Bottled Waters: VOCs Analysis and Migration Studies

American Journal of Analytical Chemistry 2013年第4期4卷 176-189页

作者： Aline Ghanem Jacqueline Maalouly Roula Abi Saad Dalia Salameh chawki oscar saliba UMR (Emballages Alimentaires au Liban) Faculty of Sciences II Lebanese University Jdeidet El-Matn Lebanon

Despite the worldwide increase in the consumption of PET-bottled mineral waters compared to tap waters encouraged by its microbiological and chemical safety for public health, contaminants could migrate from the plastic packaging into the water and induce adverse effects on human health. Volatile organic compounds (VOCs), including benzene, toluene, ethylbenzene, ortho, meta, and para-xylenes (BTEX), styrene, chlorobenzene and benzaldehyde are among the potential contaminants of bottled waters. This study aimed to assess Lebanese PET-bottled waters, in respect of VOCs contents, with comparison to polycarbonate-bottled and tap waters. Both HS-SPME-GC/FID and SPE-GC/FID were optimized and validated for VOCs determination in the waters, and their performances were compared. The HS-SPME-GC/FID was valid (Afnor NF T 90-210 (May 2009)) for all the studied molecules with limits of quantifications (LOQ) far lower the maximum contaminants levels (MCLs) set by both US-EPA and WHO. SPE-GC/FID was valid only for ethylbenzene, m/p-xylenes, o-xylene, and styrene, with poorer LOQs. HS-SPME-GC/FID was used therefore for VOCs monitoring in studied water samples showing the safety of the Lebanese bottled-water. The effects of bottles storage conditions (time, and exposure to sunlight) on VOCs migration were also studied.

关键词： BTEX Styrene HS-SPME-GC/FID SPE-GC/FID

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A Methodological Approach to Study Almond Oil Stability in Relation to <i>α</i>-Tocopherol Supplementation

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Food and Nutrition Sciences 2012年第12期3卷 1710-1715页

作者： Lizette Auezova chawki saliba Elie Hajj-Moussa Leina El Hosry Said Yammine Ramez Chahine Department of Chemistry Faculty of Sciences II Lebanese University Fanar Jdaidet el Matn Lebanon Faculty of Agriculture and Veterinary Sciences Lebanese University Dekwaneh Beirut Lebanon Faculty of Medical Sciences Lebanese University Hadath Campus Beirut Lebanon Faculty of Pharmacy Lebanese University Hadath Campus Beirut Lebanon

The objectives of the present study were to identify a suitable parameter to assess the oil oxidation and to study the possibilities of delaying the oxidation of moderately oxidized unrefined almond oil by adding supplementary amounts of α-tocopherol. Three oil samples, with initial peroxide values of 13.3, 19.5 (moderately oxidized oils), and 28.9 (oxidized oil), were supplemented with 100, 250 and 500 ppm of α-tocopherol and subjected to the oxidation at 50°C for 9 days. The level of oxidation was determined by measuring peroxide value (PV), conjugated dienes (CD) and thiobarbituric acid reactive substances (TBARS). Chemometric analysis indicated that, under the conditions of the present study, PV was the most suitable indicator of oil oxidation. The results have shown that the α-tocopherol could have an anti- oxidant or pro-oxidant effects, depending on its concentration and initial level of oil oxidation. Results also show that α-tocopherol addition at all the concentrations tested resulted in pro-oxidation of the moderately oxidized oils;hence additional supplementation with α-tocopherol could not be recommended to delay oxidation of unrefined almond oil.

关键词： Almond Oil Oxidative Stability α-Tocopherol PV CD TBARS Chemometrics

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