engleski

Effects of storage conditions on the migration of phthalates from plastic packaging to bottled natural mineral water

Plastic is the most common type of packaging material on the market today, universally accepted due to characteristics such as low mass, high inertness, low price and good flexibility. Most bottled water and soft drinks are packaged in polyethylene terephthalate (PET) plastic bottles and despite the excellent properties of such packaging, various compounds (e.g. micro and nanoplastics, phthalates, toxic elements) can be used either in the production of plastics or as a result of the mechanical stress to which bottles are exposed in daily use to migrate into beverages. The aim of this study was to determine the concentrations of different phthalates (dimethyl phthalate – DMP, diethyl phthalate – DEP, dibutyl phthalate – DBP, di-iso-butyl phthalate – DiBP, benzyl butyl phthalate – BBP, bis(2- ethylhexyl) phthalate – DEHP and di-n-octyl phthalate – DOP) in commercially available carbonated (Jamnica) and non-carbonated (Jana) natural mineral water stored in several types of glass (transparent and green coloured) and PET packaging (virgin or 100% recycled) exposed to elevated temperatures and direct sunlight for 0, 7 and 30 days. A gas chromatography-mass spectrometry (GC-MS) was developed and validated for simultaneous determination of selected phthalates. Water samples were extracted with dichloromethane, dried by nitrogen and finally, the dried samples dissolved in 0.2 mL of dichloromethane. The concentrations of DMP, BBP and DOP were below the limit of detection in the analysed samples. DEP, DBP, DiBP and DEHP were present in low concentrations in water samples of all tested packaging with tendency of somewhat increasing concentrations after storage for 30 days under the described conditions. The highest concentration of 2.58 µg/L was found for DBP in non-carbonated water sample packaged in 100% recycled PET after 30 days of storage. The concentrations of DEHP (0.31-2.12 µg/L) were well below the recommendations of the World Health Organization [1] for drinking water (<8 μg/L), while the other analysed phthalates have no comparable health guidelines. Acknowledgement This work was financially supported by the grant Development of functional beverage in sustainable packaging – JamINNO+ (KK.01.2.1.02.0305) funded by the European Regional Development Fund within the Operational Programme Competitiveness and Cohesion 2014-2020. References [1] World Health Organization (WHO), Guidelines for drinking-water quality, 4 th ed., 2011.

plastic packaging ; phthalates ; GC-MS ; mineral water

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