Utjecaj ambalažnog materijala i sastava plinova u modificiranoj atmosferi na upakirani svježi list koprive

master's thesis

• Title (english): Influence of packaging material and gas composition in modified atmosphere on packaged fresh nettle leaf
• Author: Petra Pišonić
• Mentor: Mia Kurek (mentor)
• Committee member: Mario Ščetar (predsjednik povjerenstva)
• Committee member: Maja Repajić (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: 2023-09-26, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Food Technology

Abstract

Kopriva je biljka visoke stope respiracije te se od davnina koristi zbog svojih korisnih učinaka na zdravlje. U ovome radu promatran je utjecaj polimernih materijala, kao i plinskih sastava na stvaranje modificirane atmosfere i skladištenje koprive tijekom 9 dana. Korištena su četiri materijala, tri sintetska polimera: polietilen niske gustoće (PE-LD), biaksijalno orijentirani polipropilen (BOPP) i poliamid/polietilen (PA/PE) te jedan biorazgradivi polimer - polimliječna kiselina (PLA). Zbog visoke propusnosti na vodenu paru (8,59·10⁻¹² g m/s Pa) i plinove (PO₂ : 0,11 cm³ /m d bar; PCO₂ : 0,153 cm³ /m d bar), PLA se pokazao prikladan za kratkotrajno skladištenje svježih listova koprive, dok je PA/PE zbog vrlo niske propusnosti vodene pare i plinova neprikladan za pakiranje dišućih proizvoda, jer dolazi do naglog porasta CO₂ u pakovini. U uzorcima upakiranih u PE-LD i BOPP, ravnoteža plinova u pakovini postignuta je pri puno nižim udjelima kisika u usporedbi s kontrolnim uzorcima te je postignuta i bolja opća kvaliteta proizvoda.

Abstract (english)

Nettle is a plant with a high rate of respiration and has been used since ancient times for its beneficial effects on health. In this work, the influence of polymer materials, as well as gas compositions, on the formation of a modified atmosphere and the storage of fresh nettle leaves for 9 days was observed. Four packaging materials were used, three synthetic polymers: low-density polyethylene (PE-LD), biaxially oriented polypropylene (BOPP) and polyamide/polyethylene (PA/PE) and one biodegradable material - polylactic acid (PLA). Due to high permeability to water vapor (8.59·10⁻¹²g m/s Pa) and gases (PO₂ : 0.11 cm³ /m d bar; PCO₂ : 0.153 cm³ /m d bar) PLA proved to be suitable for short-term storage of fresh nettle leaves, while PA/PE, due to its very low water vapor and gas permeability, was characterised as unsuitable for packaging breathable products, as there was a sudden increase of CO₂ in the packaging. In the samples packaged in PE-LD and BOPP, the gas balance in the package was achieved at much lower proportions of oxygen compared to the control samples, and a better general quality of the product was also achieved.

• Keywords: kopriva; pakiranje u modificiranoj atmosferi; polimerna ambalaža; propusnost na plinove; sastav plinova u pakovini
• Keywords (english): nettle; packaging in a modified atmosphere; polymer packaging; permeability to gases; composition of gases in the package
• Language: croatian
• URN:NBN: urn:nbn:hr:159:710481
• Study programme: Title: Food Safety Management; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka upravljanja sigurnošću hrane (magistar/magistra inženjer/inženjerka upravljanja sigurnošću hrane)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-07-04 09:10:17