نوع مقاله : مقاله پژوهشی فارسی

نویسندگان

گروه علوم و صنایع غذایی، واحد شهرقدس، دانشگاه آزاد اسلامی، تهران، ایران

چکیده

کره به‌عنوان یک نوع فرآورده لبنی، از خامه شیرین یا خامه ترش تهیه می‌شود که می‌تواند به دلیل تغییرات اکسیداتیو دچار فساد شود. این تحقیق با هدف بررسی اثرات آنتی‌اکسیدانی عصاره دانه چیا در کره حاصل از خامه شیرین جهت بهبود ویژگی‌های شیمیایی (اسیدیته، عدد اسیدی، عدد پراکسید و اسید تیوباربیتوریک) و حسی (رنگ، بو، طعم، بافت و پذیرش کلی) آن طی دو ماه نگهداری در یخچال انجام گردید. ابتدا عصاره الکلی دانه چیا تهیه و میزان پلی‌فنول کل و فعالیت آنتی‌اکسیدانی آن ارزیابی گردید و سپس با درصدهای مختلف (05/0، 1/0، 25/0 و 5/0) به کره افزوده شد و اثرات آن بر ویژگی‌های کره ارزیابی شد. نتایج مقدار پلی‌فنول کل حدود 79/111 ±78/1108 میلی‌گرم اسید گالیک بر 100 گرم عصاره و قدرت مهارکنندگی عصاره دانه چیا در محدوده غلظت 20- 4 درصد، 47/0 ±17/35 تا 95/2 ±92/64 درصد به‌دست آمد. نتایج نشان داد با افزایش میزان عصاره دانه چیا در کره، میزان اسیدیته و عدد اسیدی به‌طور معنی‌داری نسبت به نمونه شاهد افزایش و عدد پراکسید و اسید تیوباربیتوریک کاهش یافت (05/0>p). همچنین تمامی این شاخص‌های شیمیایی با افزایش مدت زمان نگهداری به‌طور معنی‌داری افزایش یافتند (05/0p<). تمامی نمونه­ها از نظر ویژگی­های حسی (به استثنای بو) در طول 60 روز نگهداری با نمونه شاهد تفاوت معنی‌داری داشتند (05/0p<)، به‌طوری که تیمارها از امتیازات رنگ و طعم بهتری نسبت به شاهد برخوردار بودند. به‌طور کلی غلظت 5/0 درصد عصاره چیا باعث به تعویق انداختن فساد اکسیداتیو گردید اما از نظر ارزیابی حسی، تیمار حاوی 25/0 درصد عصاره چیا به‌عنوان تیمار برتر انتخاب و معرفی می‌گردد.

کلیدواژه‌ها

موضوعات

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