Vedecký časopis

45 2006

Journal of Food and Nutrition Research
Súhrny čísla 1 / 2006

Diffusion and adsorption of BaP from vegetable oils onto polyethylene terephtalate and low density polyethylene package
Journal of Food and Nutrition Research, 45, 2006, č. 1, s. 12-16

Peter Šimko, VÚP Food Research Institute, Priemyselná 4, P. O. Box 25, SK-824 75 Bratislava 26, Slovak Republic. Tel.: 00 421 2 5557 4622, fax: 00 421 2 5557 1417, e-mail: peter.simko@vup.sk

Súhrn: Sunflower and rapeseed oils were spiked with benzo[a]pyrene (BaP) at the level of 37.1 and 29.4 µg.kg-1, respectively. Then, the oils were filled into polyethylene terephtalate (PET) and low density polyethylene (LDPE) cylindrical shape receptacles and BaP concentrations were followed within 49 h using HPLC with fluorescence detection. It was found that the concentration in the oils in contact with PET were decreased considerably (sunflower oil 25.9 µg.kg-1 and rapeseed oil 22. 8 µg.kg-1) due to sorption of BaP onto PET, while no decrease in concentration of BaP was observed in the oils in contact with PE. It was possible to describe the rate of BaP removal by kinetic equation and calculate diffusion coeffi­cients. The results showed that PET is able to decrease BaP concentration in both vegetable oils and the decrease is due to monolayer sorption processes taking place on the PET surface. As found, LDPE is inappropriate material for BaP removal from sunflower and rapeseed oils, because BaP concentration in the oils remained at a constant level during the whole experiment.

Kľúčové slová: polycyclic aromatic hydrocarbons; benzo[a]pyrene; sunflower oil; rapeseed oil; polyethylene terephtalate; polyethylene; adsorption

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