کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4563280 1628525 2016 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Development of flexible bactericidal films based on poly(lactic acid) and essential oil and its effectiveness to reduce microbial growth of refrigerated rainbow trout
ترجمه فارسی عنوان
توسعه فیلم های ضد باکتری انعطاف پذیر بر اساس پلی (اسید لاکتیک) و اسانس و اثربخشی آن برای کاهش رشد میکروبی ماهی قزل آلا رنگین کمان سرد
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش تغذیه
چکیده انگلیسی


• Origanum vulgare L. (OEO) essential oil was successfully incorporated into PLA matrices.
• Inclusion of 0.5% OEO, increased the flexibility of resulting film up to 6-fold.
• Active PLA films showed bactericidal effect against four tested foodborne pathogens.
• Antimicrobial performance was higher in direct contact than in vapor phase.
• PLA-based films with OEO reduced the microbial growth of refrigerated rainbow trout.

The main shortcoming of poly(lactic acid) (PLA) for food packaging applications is its brittleness. The aim of this work was to evaluate the potential use of Origanum vulgare L. essential oil (OEO) in PLA-based matrices to obtain developed bio-based films with enhanced mechanical properties as well as antimicrobial performance. The PLA-essential oil composite films were more flexible than neat PLA films; so that up to 6-fold increase in the elongation-at-break values (2.82–16.78%) were acquired when 0.5% (w/w) oil was added to the polymer matrix. The addition of essential oil decreased the PLA glass transition temperature (Tg), as the result of the polymer plasticization, and led to modification of the tensile behavior. AFM results confirmed that the PLA surface microstructure was drastically influenced in terms of roughness parameters (Ra and Rq) when OEO was added. The films’ antimicrobial activities were induced by incorporating essential oil, which were more effective against the bacteria in direct contact method than a vapor phase. However, in both of test methods, Staphylococcus aureus was the most sensitive bacterium to OEO-containing films, while Escherichia coli was the most resistant. Then, efficacy of bioactive film included with 1.5% (w/w) essential oil to reduce microbial growth of rainbow trout during chilled storage was evaluated; the results indicated that antimicrobial PLA film was effective against all the microorganisms tested in this study. These results suggest that the developed PLA films with active substance could be used in designing antimicrobial packaging materials.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: LWT - Food Science and Technology - Volume 72, October 2016, Pages 251–260
نویسندگان
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