نوع مقاله : مقاله پژوهشی

نویسندگان

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

چکیده

فرآورده‌های نانوایی غنی شده با سبوس گندم، منبعی سرشار از فیبر می­باشند، اما وجود ترکیبات ضد­تغذیه­ای نظیر اسید فیتیک در سبوس گندم و به­علاوه ایجاد اثرات تکنولوژیکی نامطلوب در نان در اثر برهم­کنش سبوس گندم با ترکیبات ساختار­ساز آن، موجب محدودیت مصرف این فرآورده­ها می­گردد. لذا در این پژوهش برای تولید نان غنی­شده قالبی از سبوس پیش­فرآوری شده گندم، استفاده گردیده است. سپس اثر متغیر­های امولسیفایر سدیم استئاروئیل-2- لاکتیلات (8/0-0 درصد)، آنزیم زایلاناز (05/0-0 درصد) و قند الکلی سوربیتول (6-0 درصد) به­عنوان مواد بهبود­دهنده بر پارامترهای فیزیکوشیمیایی و تکنولوژیکی نان غنی شده با 15 درصد سبوس فرآوری شده گندم براساس روش سطح پاسخ در قالب طرح مرکب مرکزی چرخش­پذیر بررسی شده است. نتایج آزمایشات نشان داد که ویژگی­های بافتی همچون سفتی مغز نان، پیوستگی و قابلیت جویدن، حجم مخصوص، روشنایی رنگ پوسته، رطوبت مغز و پوسته نان و ویژگی­های یکپارچگی، مدور بودن و گردی حفرات مغز نان به­واسطه اثر مستقل و تقابل هم­افزای مواد بهبود­دهنده به­طور معنی­داری بهبود یافتند. در نهایت فرمول بهینه شامل: 563 /0 درصد امولسیفایر SSL، 040/0 درصد آنزیم زایلاناز و 356/2 درصد قند الکلی سوربیتول بدست آمد. نمونه بهینه و نمونه شاهد (فاقد مواد بهبود­دهنده) با استفاده از آزمون گرماسنجی روبشی افتراقی و تصاویر میکروسکوپ الکترونی روبشی مقایسه شدند و نتایج حاکی از کاهش قابل توجه آنتالپی و افزایش دمای اولیه ژلاتیناسیون در نمونه بهینه نسبت به نمونه شاهد بود، به­علاوه در نمونه نان شاهد شبکه گلوتنی دارای پیوستگی کم‌تری بود و گرانول­های نشاسته موجود در آن تورم بیشتری نسبت به نمونه بهینه داشتند. لذا باتوجه به نتایج این دو آزمون می­توان نتیجه گرفت که میزان بیاتی نمونه بهینه تحت اثر هم­افزای سه ماده بهبود­دهنده کمتر از نمونه شاهد است.

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