تولید مواد بسته‌بندی زیست تخریب پذیر بر پایه‌ی نشاسته-کفیران-نانو اکسید روی: خواص فیزیکی و مکانیکی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار گروه علوم و مهندسی صنایع غذایی، دانشکده کشاورزی، دانشگاه زنجان، زنجان، ایران

2 دانشجوی کارشناسی ارشد علوم و مهندسی صنایع غذایی، دانشگاه آزاد اسلامی، واحد تهران شمال، تهران، ایران

چکیده

در این پژوهش، فیلم زیست تخریب پذیر نشاسته-کفیران-اکسید روی به روش قالب گیری ساخته شد. فیلم های تولید شده، حاوی (1%-3%-5%) از نانو ذرات اکسید روی بودند که توسط هموژنایزر اولتراسونیک به صورت یکنواخت در آمده و سپس به محلول نشاسته-کفیران افزوده شد. ویژگی­های سطحی، ضخامت، محتوای رطوبت، نفوذ پذیری به بخار آب و خواص مکانیکی مورد بررسی قرار گرفت. در تصویر قطرات آب مشاهده شد که زاویه تماس نمونه­ی نشاسته-کفیران 67/89 درجه است. با  افزایش مقدار نانو اکسید روی تا 1% زاویه تماس به طور معناداری به 63/95 درجه افزایش پیدا کرد و این به معنای بهبود خواص سطحی و آبگریزی تلقی می گردد. نفوذپذیری به بخار آب برای فیلم نشاسته-کفیران (×10−10 g m-1s−1Pa−1) 12/3 بوده است، که با افزایش غلظت اکسید روی تا 3% به 03/2 (×10−10 g m-1s−1Pa−1 ) رسید.  نتایج آزمون مکانیکی نشان داد که با افزایش مقدار نانوذره تا ٣٪‏، استحکام کششی و مدول یانگ نمونه ها افزایش یافته و ازدیاد طول در نقطه پاره شدن کاهش می­یابد. در نهایت می توان گفت، نانوذرات اکسید روی، برخی خواص فیلم نشاسته-کفیران را بهبود بخشید.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Production of Biodegradable Packaging Material Based on Starch-kefiran-ZnO: Physical and Mechanical Characterization

نویسندگان [English]

  • Iman Shahabi-Ghahfarrokhi 1
  • Amin Babaei-Ghazvini 2
1 Assistant Professor, Department of Food Science and Engineering, Faculty of Agriculture, University of Zanjan, Zanjan, Iran
2 Graduated MS Student, Islamic Azad University, Tehran Branch, Tehran, Iran
چکیده [English]

In this study, biodegradable film based on starch-kefiran-ZnO was made by casting method. The produced films contain different content of nano ZnO (ZN) (1%, 3%, and 5% wt.). Also ZN dispersed by ultrasonic homogenizer and added to the starch-kefiran solution. Surface characteristics, thickness, moisture content, water vapor permeability and mechanical properties were investigated. In the images of water droplets, it was observed that the contact angle of starch-kefiran was 89.67 degrees. By increasing the amount of zinc oxide nanoparticles up to 1%, the contact angle increased significantly to 95.63 degrees, which means improving the surface properties and hydrophobicity. The water vapor permeability for starch-kefir film (×10−10 g m-1s−1Pa−1) was 3.12, which was increased to 2.03 (×10−10 g m-1s−1Pa−1) by increasing the concentration of zinc oxide up to 3%. Tensile strength and Young’s modulus of the specimens were increased by increasing ZN content up to 3%. On the other hand, elongation at break of the nanocomposites was decreased, simultaneously. It is obvious that, ZN was improved some of the packaging properties of the starch-kefiran film.

کلیدواژه‌ها [English]

  • starch
  • Kefiran
  • ZnO
  • Nanocomposite
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