پایداری اکسایشی روغنهای زیتون تجاری ایران

نوع مقاله : مقاله پژوهشی

نویسندگان

• رضا فرهوش
• محمدحسین حدادخداپرست

گروه علوم و صنایع غذایی، دانشکده کشاورزی، دانشگاه فردوسی مشهد، مشهد، ایران.

https://doi.org/10.22067/ifstrj.v8i3.18469

چکیده

در تحقیق حاضر، پایداری اکسایشی نه نمونه روغن زیتون رایج در بازار ایران شامل چهار نمونه بکر و پنج نمونه بی بو شده در مقایسه با دو نمونه روغن زیتون بکر خارجی مورد مطالعه قرار گرفت. روغنهای بکر خارجی در مجموع دارای نسبت MUFA/PUFA بالاتری (میانگین 27/9) در مقایسه با روغنهای زیتون داخلی (میانگین 70/5) بودند. اعداد پراکسید و اسیدی روغنهای زیتون مورد مطالعه به ترتیب در محدوده های 5/8 تا 5/14 میلی‌اکی‌والان گرم بر کیلوگرم و 1/0 تا 27/4 میلی گرم بر گرم قرار داشت. میزان ترکیبات توکوفرولی نمونه های بکر خارجی به طور متوسط (7/436 پی‌پی ام) بیش از انواع داخلی و حتی حدود دو برابر انواع بکر داخلی (4/223 پی پی ام) بود. به طور متوسط، روغنهای بکر خارجی حامل ترکیبات فنلی (0/154 پی پی ام) بیش از انواع بکر داخلی (3/112 پی پی ام) و بخصوص روغنهای بی بو شده (0/46 پی پی ام) بودند. تفسیر میزان پایداری روغنهای زیتون مورد مطالعه بر حسب داده های ساختار شیمیایی بخوبی صورت گرفت؛ به گونه ای که روغنهای بکر خارجی در مجموع از ساختار شیمیایی مطلوبتر و به تبع آن پایداری به ترتیب بیشتری نسبت به روغنهای زیتون بکر و بی بو شده داخلی برخوردار بودند.

کلیدواژه‌ها

• روغن زیتون
• پایداری اکسایشی
• ساختار شیمیایی

عنوان مقاله [English]

Oxidative Stability of Iranian Commercial Olive Oils

نویسندگان [English]

• Reza Farhoosh
• Mohammad Hossein Hadad Khodaparast

Department of Food Science and Technology, Ferdowsi University of Mashhad, Mashhad, Iran.

چکیده [English]

In the present study, the oxidative stability of nine Iranian commercial olive oils, including four virgin samples and five deodorized ones, was compared to that of two foreign virgin olive oils. In total, the foreign samples had the MUFA/PUFA ratios (av. 9.27) higher than those of domestic ones (av. 5.70). The peroxide and acid values of the olive oils studied ranged from 8.5 to 14.5 meq/kg and from 0.1 to 4.27 mg/g, respectively. Tocopherols content of the foreign olive oils (av. 436.7 ppm) was averagely higher than that of the domestic olive oils and even about two times that of domestic virgin ones (223.4 ppm). On average, the foreign virgin olive oils contained phenolic compounds (154.0 ppm) higher than that of the domestic ones (112.3 ppm) and especially deodorized olive oils (46.0 ppm). The oxidative stability of oil samples was suitably interpreted in terms of chemical composition data, so that the foreign virgin olive oils had more appropriate chemical composition in total, and therefore, indicated oxidative stabilities higher than those of the domestic virgin and deodorized olive oils.

کلیدواژه‌ها [English]

• chemical composition
• Olive oil
• Oxidative Stability

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