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

نوع مقاله : مقاله پژوهشی فارسی

نویسندگان

• مژگان اکبری
• رضا فرهوش
• مرضیه معین فرد

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

10.22067/ifstrj.2023.80273.1228

چکیده

در پژوهش حاضر، تجزیه‌وتحلیل سینتیکی رفتار آنتی­اکسیدانی اسیدگالیک، متیل­گالات و TBHQ در تری­آسیل­گلیسرول‌های 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 آنتی­اکسیدانی (A) که ترکیب فاکتور پایداری و قدرت موردبررسی قرار گرفت. پایداری اکسایشی تری­آسیل­گلیسرول‌ها به‌صورت معنی‌داری در حضور آنتی‌اکسیدان‌های افزوده‌شده در سطح غلظتی و دمایی، نسبت به نمونه کنترل بهبود یافت. در دمای 80 و هر دو نوع تری­آسیل­گلیسرید مورداستفاده، قدرت آنتی­اکسیدانی TBHQ به‌طور معنی­داری از اسید­گالیک و متیل­گالات بیشتر بود. در روغن آفتابگردان، متیل­گالات قدرت آنتی­اکسیدانی بیشتری نسبت به اسید­گالیک نشان داد و نتایج به‌دست‌آمده با خاصیت حملی بالاتر اسید­گالیک مطابقت نداشت، درحالی‌که در روغن‌زیتون، اسید­گالیک قدرت آنتی­اکسیدانی بیشتری نشان داد. زمان لازم برای رسیدن به حد بحرانی عدد کربونیل، برای هر دو نوع تری­آسیل­گلیسرول و تمام تیمارها به‌صورت معنی­دار نسبت به تیمار کنترل، در دمای 80 درجه سانتی‌گراد، بهبود نشان داد و بین دو تیمار اسید­گالیک و متیل­گالات، متیل­گالات مؤثرتر بود.

کلیدواژه‌ها

• پایداری حرارتی
• سینتیک
• عددهای اکسیداسیون

موضوعات

• شیمی مواد غذایی

©2023 The author(s). This is an open access article distributed under Creative Commons Attribution 4.0 International License (CC BY 4.0), which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source.

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