بررسی تاثیر آغازگر لاکتوباسیلوس غالب جدا شده از خمیرترش سنّتی بر میزان بیاتی نان قالبی حاصل از آرد کامل گندم

مجله پژوهشهای علوم و صنایع غذایی ایران

مقاله 12، دوره 13، شماره 1 - شماره پیاپی 43، فروردین و اردیبهشت 1396، صفحه 141-154   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/ifstrj.v1395i0.41459

نویسندگان

عباس عابدفر؛ علیرضا صادقی^* ؛ مهدی کاشانی نژاد؛ مرتضی خمیری؛ مهران اعلمی

گروه علوم و صنایع غذایی، دانشگاه علوم کشاورزی و منابع طبیعی گرگان.

چکیده

در این پژوهش پس از جداسازی آغازگر لاکتوباسیلوس غالب موجود در خمیرترش سنّتی حاصل از آرد کامل گندم و تائید شناسایی آن با استفاده از PCR دارای پرایمر اختصاصی، از آغازگر مذکور جهت تولید خمیرترش استفاده شد. سپس تاثیر زمان تخمیر (8 ،16، 24 ساعت) و مقدار شکر (5/0، 1، 5/1درصد) بر فعالیت آغازگر لاکتوباسیلوس جدا شده مورد ارزیابی قرار گرفت. پس از فرآوری نان قالبی با استفاده از تیمارهای خمیرترش ، بیاتی نان‌های تولیدی در یک بازه زمانی چهار روزه (2، 48 و 96 ساعت پس از پخت) براساس شاخص سفتی بافت (به روش بافت‌سنجی) مورد بررسی قرارگرفت. همچنین میزان تخلخل (به روش پردازش تصویر) و ویژگی های حسّی نان تازه خوری نیز با نمونه شاهد مقایسه شد. نتایج حاصل نشان داد که کمترین و بیشترین میزان سفتی بافت نان پس از 96 ساعت به ترتیب مربوط به نمونه های فرآوری شده با خمیرترش تخمیر شده طی 24 ساعت و دارای 5/0 درصد شکر و همچنین خمیرترش تخمیر شده طی 8 ساعت و دارای 5/1درصد شکر بود. علاوه بر این، بیشترین مقدار تخلخل نان تازه‌خوری در نمونه حاصل از تخمیر 24 ساعت خمیرترش و محتوی 5/1 درصد شکر و کمترین مقدار آن نیز در نمونه حاصل از 8 ساعت تخمیر با محتوی 5/0 درصد شکر مشاهده گردید. پس از ارزیابی نتایج حاصل از این آزمون ها، رابطه بین عوامل موثر بر تخمیر خمیرترش به‌منظور بررسی خصوصیات بافتی نان های تولیدی بر اساس رفتار ویسکوالاستیک آن ها نیز مورد بررسی قرار گرفت.

کلیدواژه‌ها

نان خمیرترشی؛ بیاتی؛ تخلخل؛ آرد کامل گندم؛ آغازگر لاکتوباسیلوس غالب

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