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Incorporation of nisin in poly (ethylene-co-vinyl acetate) films by melt processing: a study on the antimicrobial properties
- Publication Year :
- 2011
- Publisher :
- International Association for Food Protection (IAFP), 2011.
-
Abstract
- Both industry and academia have shown a growing interest in materials with antimicrobial properties suitable for food packaging applications. In this study, we prepared and characterized thin films of ethylene-co-vinyl acetate (EVA) copolymer with antimicrobial properties. The films were prepared with a film blowing process by incorporating a nisin preparation as an antimicrobial agent in the melt. Two grades of EVA containing 14 and 28% (wt/wt) vinyl acetate (EVA 14 and EVA 28, respectively) and two commercial formulations of nisin with different nominal activities were used. The effect of the nisin concentration also was evaluated. The films with the highest antimicrobial activity were those formulated with nisin at the highest activity and EVA with the highest content of vinyl acetate. The use of the commercial formulation of nisin with high activity in the EVA films allowed reduction in the amount of nisin needed to provide antimicrobial properties. Consequently, the mechanical properties of these films were only slightly inferior to those of the pure polymers. In contrast, films prepared by incorporating more of the nisin with lower activity had poor mechanical properties. The effect of different processing temperatures used in the preparation of the films on the antimicrobial properties of the films also was evaluated. The materials displayed antimicrobial properties even when they were prepared at temperatures as high as 160 °C, probably because of the very short processing time (60 to 90 s) required for preparation.
- Subjects :
- Materials science
Ethylene
Time Factors
Food Contamination
Bacterial Physiological Phenomena
Microbiology
chemistry.chemical_compound
Bacteriocin
otorhinolaryngologic diseases
Copolymer
Vinyl acetate
Organic chemistry
Humans
Nisin
Poly ethylene
Dose-Response Relationship, Drug
Food Packaging
Temperature
Antimicrobial
Anti-Bacterial Agents
Food packaging
chemistry
Consumer Product Safety
Biofilms
Food Microbiology
EVA, antimicrobial properties, nisin, melt processing, controlled release
Polyvinyls
Food Science
Nuclear chemistry
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....b33d57f0d7e476b708aa99b074d761eb