Karakterizacija višeslojnih filmova od poli (mliječne kiseline) i barijernog sloja od želatine

master's thesis

• Title (english): Characterization of multilayer poly (lactic acid) films and gelatin barrier layer
• Author: Katarina Raguž
• Mentor: Mia Kurek (mentor)
• Committee member: Mario Ščetar (predsjednik povjerenstva)
• Committee member: Nives Marušić Radovčić (član povjerenstva)
• Committee member: Ivona Elez Garofulić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Food Technology and Biotechnology; (Department of Food Engineering); (Laboratory for Food Packaging); Zagreb
• Defense date and country: 2022-11-15, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Food Technology

Abstract

Inovacije u području pakiranja hrane usmjerene su na alternativne metode i ekološki prigvatljive materijale koji ispunjavaju zahtjeva tržišta i potrošača za smanjenom upotrebomplastičnih ambalažnih materijala. U ovome radu karakterizirani su filmovi na bazi poli(mliječnekiseline) (PLA) s dodatkom sloja želatine (GEL), s i bez dodatka galne (GA) i taninskekiseline (TA). Ispitivana su određena fizikalno kemijska svojstva, kao štosu: debljina, boja, transparentnost, propusnost plinova, te propusnost na vodenu paru.Debljina filmova se povećala nakon dodatka sloja želatine, galne i taninske kiseline u odnosuna kontrolni PLA film. Ukupna razlika u obojenosti nije bila vidljiva ljudskom oku. Dodatkom želatine, te želatine i galne kiseline, smanjila se prozirnost u odnosu na kontrolniuzorak. Dodatkom galne i taninske kiseline dobiva se nepropusnija i kompleksnija struktura,zbog tog što se povećava kristaličnost matriksa. Najveću brzinu prijenosa vodene pare izmjeren je ukontrolnom uzorku (PLA) dok se brzina prijenosa vodene pare smanjuje se dodatkom želatine, galne itaninske kiseline.

Abstract (english)

Innovations in the field of food packaging are focused on alternative methods and environmentally friendly materials that meet market and consumer demands for reduced use of plastic packaging materials. In this work, films based on poly(lactic acid) (PLA) with the addition of a layer of gelatin (GEL), without and with the addition of gallic (GA) and tannic acid (TA) were investigated. These samples were tested for certain physico-chemical properties, such as thickness, colour, transparency, gas permeability, and water vapour permeability. The thickness of the films increased after the addition of a layer of gelatin, gallic and tannic acid compared to the control PLA film. The overall difference in colour was not visible to the human eye. With the addition of gelatin, and gelatin with gallic acid, the transparency decreased compared to the control film. With the addition of gallic and tannic acid, an impermeable and complex structure was obtained, due to the fact that the crystallinity of the matrix was increased. The control sample PLA had the highest water vapor transfer rate, while it was reduced by the addition of gelatin, gallic and tannic acid.

• Keywords: poli (mliječna kiselina); želatina; fenolne kiseline; višeslojni filmovi; barijerna svojstva
• Keywords (english): poly (lactic acid); gelatin; phenolic acids; multilayer films; barrier properties
• Language: croatian
• URN:NBN: urn:nbn:hr:159:283278
• Study programme: Title: Food Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka prehrambenog inženjerstva (magistar/magistra inženjer/inženjerka prehrambenog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-04-24 12:44:48