Utjecaj ultrazvuka visoke snage na fizikalno-kemijske karakteristike barijernih filmova za pakiranje hrane

doctoral thesis

• Title (english): High power ultrasound impact on the physico-chemical characteristics of barrier films aimed for food packaging
• Author: Mario Ščetar
• Mentor: Kata Galić (mentor)
• Committee member: Vesna Lelas (predsjednik povjerenstva)
• Granter: University of Zagreb; Faculty of Food Technology and Biotechnology; Zagreb
• Defense date and country: 2014-05-16, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Food Technology
• Universal decimal classification (UDC): 678 - Industries based on macromolecular materials. Rubber industry. Plastics industry

Abstract

Istražen je utjecaj ultrazvuka (sonifikacija) na parametre propusnosti (koeficijent permeabilnost, topljivosti i difuzije) kisika kroz barijerne materijale namjenjene za pakiranje hrane. Istraživanja su provedena na dva biaksijalno orijentirana polipropilenska filma (BOPP), s akrilnim i poli(viniliden-kloridnim) barijernim premazom (BOPPAcPVDC) i koekstrudirang polipropilena (BOPPcoex). Prikazan je fizikalno-kemijski profil uzoraka primjenom goniometrije, termogravimetrijske analize (TGA), razlikovne pretražne kalorimetrije (DSC), infracrvene spektroskopije s Fourierovom transformacijom (FTIR), spektrofotometrije (UV/VIS) i pretražne elektronske mikroskopije u uvjetima okoliša (ESEM). Utvrđeno je da se u istraživanim uzorcima propusnost kisika povećava sa povećanjem temperature (20 °C < 40 °C < 60 °C). Najveći utjecaj na propusnost kisika kod oba istraživana BOPP uzorka, ima tretman ultrazvuka visoke snage (UZVS) pri amplitudi od 100% tijekom 6 minuta. Međutim BOPP uzorci pokazuju različitu osjetljivost pri nižem intenzitetu UZVS tretmana. Nadalje, UZVS tretman nije uzrokovao morfološke promjene kod istraživanih BOPP uzoraka.

Abstract (english)

Investigation was focused on the impact of the ultrasound (thermosonification) on the oxygen permeation properties (the permeability, solubility and diffusion coefficients) of barrier films aimed for food packaging. For that purpose biaxially oriented polypropylene (BOPP) coated with acrylic/polyvinylidene chloride (BOPPAcPVDC) and biaxialy oriented coextruded polypropylene (BOPPcoex) were used. Physicochemical profile of samples was determined using goniometry, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), UV spectrophotometry (UV SPM) and environmental scanning electron microscopy (ESEM). It was found that the oxygen permeability for both investigated films increases with increasing temperature (20 °C < 40 °C < 60 °C). The highest influence on the oxygen permeability in both investigated BOPP samples has a high power ultrasound (HPUS) with the amplitude of 100% during 6 minutes treatment. However, BOPP samples showed different sensitivity at lower HPUS treatments. In addition, HPUS did not appear to cause morphological changes in the tested BOPP materials.

• Keywords: polipropilen; ultrazvuk; propusnost; pakiranje hrane
• Keywords (english): polypropylene; ultrasound; permeability; food packaging
• Language: croatian
• URN:NBN: urn:nbn:hr:159:680097
• Promotion: 2014-09-28
• Study programme: Title: Food Technology; Study programme type: university; Study level: postgraduate; Academic / professional title: doktor/doktorica znanosti (doktor/doktorica znanosti)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2018-05-17 11:53:32