بررسی پایداری حرارتی تری‌آسیل‌گلیسرول‌های آفتابگردان و زیتون تحت تأثیر اسید‌گالیک و متیل‌گالات

مجله پژوهشهای علوم و صنایع غذایی ایران

مقاله 3، دوره 20، شماره 2 - شماره پیاپی 86، خرداد و تیر 1403، صفحه 217-227   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/ifstrj.2023.80273.1228

نویسندگان

مژگان اکبری؛ رضا فرهوش^* ؛ مرضیه معین فرد

گروه علوم و مهندسی صنایع غذائی، دانشکده کشاورزی، دانشگاه فردوسی مشهد، مشهد، ایران

چکیده

در پژوهش حاضر، تجزیه‌وتحلیل سینتیکی رفتار آنتی­ اکسیدانی اسیدگالیک، متیل­ گالات و TBHQ در تری ­آسیل­ گلیسرول‌های روغن‌زیتون و آفتابگردان انجام شد. فرایند اکسایش روغن‌ها در رژیم سینتیکی (غلظت بالای اکسیژن) در دمای ٨٠ درجه سانتی‌گراد و در یک سطح غلظتی (2/1 میکرو مول بر گرم) در محیط تاریک صورت گرفت. پارامترهای سینتیکی مختلف شامل فاکتور پایدارسازی (F) که نمایانگر میزان کارآمدی، نسبت سرعت اکسایش (ORR) که نمایانگر قدرت، فعالیت آنتی­ اکسیدانی (A) که ترکیب فاکتور پایداری و قدرت موردبررسی قرار گرفت. پایداری اکسایشی تری­ آسیل­گلیسرول‌ها به‌صورت معنی‌داری در حضور آنتی‌اکسیدان‌های افزوده‌شده در سطح غلظتی و دمایی، نسبت به نمونه کنترل بهبود یافت. در دمای 80 و هر دو نوع تری­ آسیل­ گلیسرید مورداستفاده، قدرت آنتی­ اکسیدانی TBHQ به‌طور معنی­ داری از اسید­گالیک و متیل ­گالات بیشتر بود. در روغن آفتابگردان، متیل­ گالات قدرت آنتی­ اکسیدانی بیشتری نسبت به اسید­گالیک نشان داد و نتایج به‌دست‌آمده با خاصیت حملی بالاتر اسید­گالیک مطابقت نداشت، درحالی‌که در روغن‌زیتون، اسید­گالیک قدرت آنتی­ اکسیدانی بیشتری نشان داد. زمان لازم برای رسیدن به حد بحرانی عدد کربونیل، برای هر دو نوع تری­ آسیل ­گلیسرول و تمام تیمارها به‌صورت معنی­ دار نسبت به تیمار کنترل، در دمای 80 درجه سانتی‌گراد، بهبود نشان داد و بین دو تیمار اسید­گالیک و متیل ­گالات، متیل­ گالات مؤثرتر بود.

کلیدواژه‌ها

پایداری حرارتی؛ سینتیک؛ عددهای اکسیداسیون

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