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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 49797 (06)
- University: Sharif University of Technology
- Department: Chemical and Petroleum Engineering
- Advisor(s): Roostaazad, Reza
- Abstract:
- One of the most important concerns in food industry is decreasing the contamination of food and increasing their shelf life. Antimicrobial/antioxidant packaging, an active packaging concept, can be considered an extremely challenging technology that could have a significant impact on shelf-life extension and food safety of meat and meat products. Due to harmfulness of chemical preservatives, their use has been limited and therefore natural antimicrobial/antioxidant agents have become more popular. Propolis is a natural resinous substance, with a high polyphenol content, produced by honeybees and characterized by antimicrobial, anti-inflammatory and antioxidant properties, which make it useful for different applications such as natural bioactive compound in active packaging. In this study, the antimicrobial and antioxidant activety of propolis ethanolic extract (PE), was investigated. Active and biodegradable packaging material, polylactic acid (PLA) with and without polyethylene glycol (PEG) and calcium carbonate and added of PE were produced. Four different concentration of PE ( 0,5,10 or 15 g/g PLA) were analyzed. The effect of concentrations of PE were evaluated on: mechanical properties, stability of polyphenol concentrations and antioxidant activity, and antimicrobial activity against Staphylococcus aureus and Pseudomonas. Activity against S. aureus was observed in films with 15 g of PE/g PLA both with and without PEG/CaCO3, and against Pseudomonas in film with 15 g of PE/g PLA and PEG/CaCO3. Active films kept their antioxidant activity and polyphenol concentration for 6 days of storage in sample of meat product. Also these active and biodegradable films had good mechanical properties relative to industrial food polymers such as polyethylene and polypropylene
- Keywords:
- Polylactic Acid ; Mechanical Properties ; Antimicrobial Activity ; Active Packaging ; Propolis Ethanolic Extract ; Antioxidant Activity
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