بررسی خصوصیات فیزیکی و مکانیکی فیلم خوراکی بر پایه امولسیون نشاسته و اسید اولئیک و پوشش‌دهی میوه گوجه‌سبز

مجله پژوهشهای علوم و صنایع غذایی ایران

مقاله 12، دوره 15، شماره 4 - شماره پیاپی 58، مهر و آبان 1398، صفحه 517-527   

نوع مقاله: مقاله پژوهشی فارسی

شناسه دیجیتال (DOI): 10.22067/ifstrj.v15i4.65266

نویسندگان

مسعود تقی زاده^* ؛ اسما اقبال

گروه علوم و صنایع غذایی، دانشکده کشاورزی، دانشگاه فردوسی مشهد.

چکیده

امروزه از فیلم‌های خوراکی متنوعی برای بسته‌بندی مواد غذایی استفاده می‌شود. استفاده از این مواد زیست تخریب‌پذیر روشی نوین برای جایگزینی مواد پلیمری و افزایش ماندگاری مواد غذایی است. هدف اصلی این پژوهش تولید فیلم خوراکی بر پایه نشاسته و اسید اولئیک و بررسی ویژگی‌های آن (ضخامت، حلالیت، نفوذپذیری به بخار آب و مقاومت کششی) است. پس از این بررسی‌ها یکی از تیمارهای مناسب انتخاب و در سه غلظت برای پوشش گوجه‌سبز استفاده و موارد افت وزن، pH، رنگ و سفتی نمونه‌ها در طول 4 هفته بررسی شد. با افزایش میزان اسید اولئیک در فیلم‌های تولید شده میزان ضخامت افزایش ولی مقاومت کششی، حلالیت و نفوذپذیری فیلم‌ها به‌صورت معنی‌داری کاهش پیدا کرده است. نمونه حاوی 10% اسید اولئیک به‌عنوان بهترین فیلم از لحاظ حلالیت و نفوذپذیری به بخار آب برای پوشش‌دهی انتخاب شد. در پوشش تهیه شده برای میوه گوجه‌سبز، با افزایش میزان ماده جامد محلول، میزان افت وزن و افزایش pH در طول زمان با آهنگ کمتری اتفاق افتاده است و همچنین تغییرات رنگ نیز نسبت به نمونه شاهد در آنها کمتر می‌باشد. دو غلظت 10 و12% نیز نتایج مشابه را نشان می‌دادند.

کلیدواژه‌ها

نشاسته؛ اسید اولئیک؛ فیلم خوراکی؛ ویژگیهای فیزیکی و مکانیکی

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