نوع مقاله : مقاله پژوهشی فارسی
نویسندگان
گروه علوم و صنایع غذایی، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری، ایران
چکیده
تیمار حرارتی (خشک و مرطوب) ازجمله روشهای فیزیکی جهت اصلاح ویژگیهای عملکردی آردهای بدون گلوتن و بهبـود کیفیت محـصولات حاصـل از آنهـا میباشد. طبیعتا تأثیر حرارت متأثر از اندازه ذرات حرارتدهی شده است. در این پژوهش، آرد برنج واکسی در اندازه ذرات مختلف (180، 150 و 125) میکرون تحت تأثیر تیمار حرارتی خشک بهمدت 2 ساعت و تیمار حرارتی مرطوب (رطوبت، %25) بهمدت 5 ساعت در دمای 110 درجه سانتیگراد مورد مطالعه قرار گرفت. در این بررسی میزان آسیبدیدگی نشاسته آرد برنج و خصوصیات کیفی نان بدون گلوتن از قبیل درصد افت وزنی، حجم مخصوص نان، اندیسهای شکل، آون اسپرینگ، رنگ مغز و پوسته و بافت نان مورد بررسی قرار گرفتند. نتایج نشان داد تیمارهای حرارتی خشک و مرطوب بطور معنیدار منجر به کاهش میزان آسیبدیدگی نشاسته شدند. تأثیر اندازه ذرات بر افت وزنی، اندیس تقارن و یکنواختی، آون اسپرینگ و رنگ مغز و پوسته معنیدار نبود، اما تیمار حرارتی مرطوب نمونه حاصل از اندازه ذرات کمتر از 180 میکرون افت وزنی را در طی پخت افزایش داد. تیمار حرارتی مرطوب آرد برنج منجر به افزایش حجم مخصوص، نسبت مغز به پوسته، اندیس حجم، تیرگی و زردی پوسته و مغز نان حاصل شد، در حالیکه میزان سفتی و قابلیت جویدن نمونهها را کاهش داد. بطور کلی نمونه حاصل از ذرات 125 میکرون و تیمار حرارتی مرطوب منجر به بهبود کیفیت نان بدون گلوتن شد.
کلیدواژهها
موضوعات
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