Browsing by Subject "ftalaatti"

In the literature study paper manufacturing process and modification of wood fiber-based packaging materials were reviewed. The aim was to understand the properties of polyurethane (PU) and its suitability as an additive in fiber-based food packaging material. Also possibility of migration from food packaging materials and methods of migration analysis were reviewed. The aim of the experimental work was to examine if diisocyanates, phthalates or other substances migrate significantly from PU-impregnated wood fiber-based packaging material to cheese. The impact of storage conditions such as temperature, relative humidity (RH) and storage time on migration were examined. The base of the sample package was made of PU-impregnated fiber material (VTT Oy, Finland) and the cover film was BoPET/PE/PA/EvOH/PE-laminate (Wipak Oy, Finland). Slices of pasteurized hard Cheddar cheese (Wyke Farms Mature Cheddar, England) were packaged as samples. Migration was measured from the surface of the packaging materials and cheese using attenuated total reflection Fourier-transform infrared spectrometer (ATR-FT-IR) and from the head space of the samples using solid-phase microextraction coupled with gas chromatography and mass spectrometer (SPME-GC-MS). No diisocyanates were detected in any packaging material or cheese samples with either methods. A notable peak in the mass spectra of samples containing or having been in contact with PU was caused by 1,6-dioxacyclododecane-7,12-dione. Also one phthalate, diethyl phthalate (DEP) was detected with SPME-GC-MS in some of the samples. The peak areas of DEP decreased after two weeks storage at 10 °C, RH 56 % and 5 °C, RH 90 %, except for cheese. After four weeks storage under the warmest conditions (10 °C, RH 56 %) the peak areas increased for all the samples but decreased at the highest RH (90 %) for PU-fiber and the cheese in it. DEP was detected in almost every cheese sample packed in PU-fibre. DEP was also detected in fiber without PU. No diisocyanates or phthalates classified as harmful to human health were detected in this study. Based on the results of this migration study PU-impregnated fiber material would be safe to use in contact with food.