Karakterizacija migracijskih tvari iz polikaprolaktonskih nanokompozitnih filmova

master's thesis

• Title (english): Characterization of migrated substances from polycaprolactone nanocomposite films
• Author: Marta Puhar
• Mentor: Zlata Hrnjak-Murgić (mentor)
• Committee member: Zlata Hrnjak-Murgić (predsjednik povjerenstva)
• Committee member: Zvonimir Katančić (član povjerenstva)
• Committee member: Mirela Leskovac (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2022-07-15, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Polikaprolakton (PCL) je petrokemijski polimer, no budući da je biorazgradljiv ubraja se u biopolimere te je stoga pogodan za primjenu, kao ambalažni materijal za pakiranje hrane. Kako se u ambalažne materijale danas dodaju i različite aktivne tvari, različitih funkcijskih svojstava, važno je utvrditi mogućnost njihovih migracija u hranu. U tu svrhu, pripremljeni su i karakterizirani polikaprolaktonski nanokompozitni filmovi s dodatkom aktivnih tvari. Kao aktivne tvari korišteni su titanijev (IV) oksid (TiO2), cinkov (II) oksid (ZnO), nanočestice kitozana (NCs) te dopirani TiO2 i ZnO srebrovim ionima: Ti-Ag i Zn-Ag. Nanočestice kitozana (NCs) pripremljene su iz kitozana niskih molekulskih masa (Cs) (50.000-190.000 Da) precipitacijom. Ambalažni polikaprolaktonski nanokompozitni filmovi pripremljeni su iz otopine lijevanjem u kalupe presvučene teflonom. Polikaprolaktonski nanokompozitni filmovi (PCL/NCs/Zn, PCL/Zn-Ag, PCL/NCs/Zn-Ag, PCL/NCs/Zn-Ag-h, PCL/NCs/TiO2, PCL/Ti-Ag, PCL/NCs/Ti-Ag i PCL/NCs/Ti-Ag-h ) karakterizirani su metodama: FTIR analizom, pretražnom elektronskom mikroskopijom (SEM), difuznom refleksijskom spektroskopijom (DRS), određivanjem ukupnih te specifičnih migracija induktivno spregnutom plazmom s masenom spektrometrijom (ICP-MS). Provedenim ispitivanjima ustanovljeno je da PCL nanokompozitni filmovi pripremljeni s TiO2 zadovoljavaju uvjete o zdravstvenoj ispravnosti materijala koji dolaze u dodir s hranom, za sve vrste hrane dok PCL nanokompozitni filmovi pripremljeni s ZnO nisu prikladni za pakiranje hrane čija je pH vrijednost niža od 4,5 kako je to vidljivo iz specifičnih migracija (SM).

Abstract (english)

Polycaprolactone (PCL) is a petrochemical polymer, due to biodegradability it belongs to the group of biopolymers, therefore it is suitable for use as a food packaging material. As different active substances with different functional properties are added to packaging materials today, it is important to determine the possibility of their migration into food. For this purpose, polycaprolactone films with addition of active substances were prepared and characterized. As active compounds titanium dioxide (TiO2), zinc oxide (ZnO), chitosan nanoparticles (NCs) and doped TiO2 and ZnO with silver ions: Ti-Ag and Zn-Ag were used. Chitosan nanoparticles were prepared from low molecular weight (Cs) chitosan (50.000-190.000 Da) by precipitation. Polycaprolactone films were prepared from PCL solution by dispersing active components and pouring into Teflon molds. Polycaprolactone nanocomposite films were characterized by several techniques. FTIR spectroscopy, scanning electron microscopy (SEM), diffuse reflectance spectroscopy (DRS) and overall migration limit (OML) as well as specific migration (SM) has been determined by inductively coupled plasma by mass spectrometry (ICP-MS). From the results in the study, it was established that PCL nanocomposite films prepared with TiO2 meet the health requirements of materials that come into contact with food, for all types of food, while PCL nanocomposite films prepared with ZnO are not suitable for packaging a food with a pH value lower than 4,5 as this is evident from specific migrations (SM) results.

• Keywords: polikaprolakton; biopolimer; nanokompoziti; TiO2; ZnO; migracijske tvari; zdravstvena ispravnost
• Keywords (english): polycaprolactone; biopolymer; nanocomposites; TiO2; ZnO; migration substances; health safety
• Language: croatian
• URN:NBN: urn:nbn:hr:149:949679
• Study programme: Title: Materials Science and Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka kemijskog inženjerstva (magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2023-03-10 14:20:19