نوع مقاله : مقاله پژوهشی

نویسندگان

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

2 گروه پژوهشی فرآوری مواد غذایی، جهاد دانشگاهی مشهد، مشهد، ایران.

چکیده

هدف از این تحقیق بررسی تأثیر روش‌های انجماد (کند و سریع) و مدت زمان نگهداری خمیر منجمد در شرایط انجماد بر کیفیت کوکی حاوی آرد سورگوم اکسترود شده و اکسترود نشده به‌منظور تولید یک محصول فاقد گلوتن و مناسب برای بیماران سلیاکی بود. نتایج نشان دادند که سرعت انجماد بر ویژگی‌های فیزیکو شیمیایی کوکی حاصل از خمیر منجمد مؤثر بوده، با افزایش سرعت انجماد میزان سفتی بافت و چسبندگی خمیر به‌طور معنی‌داری (P≤0.05) کاهش یافت اما پیوستگی خمیر افزایش یافت. دمای ژلاتیناسیون افزایش و آنتالپی کل کاهش یافت، سرعت گسترش‌پذیری کوکی افزایش یافت، کوکی‌های حاصل بافت نرم‌تری داشتند ولی روشنایی کمتری نسبت نمونه‌های منجمد شده در شرایط انجماد کند داشتند. تخلخل بافت کوکی حاصل از خمیر منجمد افزایش یافت شد و قطر پوسته‌ کوکی نیز افزایش پیدا کرد. با افزایش سرعت انجماد امتیاز، ویژگی‌های حسی نیز بهبود یافتند. با افزایش دوره نگهداری خمیر منجمد نسبت گسترش‌پذیری کوکی، تخلخل بافت و قطر پوسته کاهش پیدا کرد اما میزان سفتی بافت کوکی افزایش پیدا کرد. پارامتر L* و ضریب نفوذ مؤثر کوکی به‌طور معنی‌داری (P≤0.05) کاهش یافت. در مجموع نتایج نشان دادند که فرآیند اکسترود کردن آرد سورگوم سبب بهبود ویژگی‌های فیزیکی و شیمیایی کوکی شده است و فرآیند انجماد سریع باعث بهبود کیفیت کوکی حاصل از خمیر منجمد شده است و می‌توان آز آرد سورگوم اکسترود شده به‌عنوان جایگزین مناسب گندم برای تولید کوکی استفاده کرد. همچنین استفاده از خمیر منجمد برای تولید کوکی می‌تواند روش مناسبی برای عرضه این محصول باشد.

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