بررسی اثر جدا و ترکیبی عصاره گیاه اوجی (Mentha aquatic) در پایدارسازی روغن آفتابگردان تحت شرایط حرارتی

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه صنایع غذایی دانشگاه علوم کشاورزی و منابع طبیعی ساری

چکیده

عصاره گیاه اوجی Mentha aquatique با استفاده از اولتراسوند و ماسراسیون (اتانول:آب (80:20)) استخراج شد و با یکدیگر مقایسه شدند. فنول کل عصاره در روش ماسراسیون و اولتراسوند به ترتیب 16/45 mg GA/g و 92/51 mg GA/g عصاره به دست آمد. فعالیت آنتی اکسیدانی غلظت­های مختلف عصاره (50، 100، 250، 500، 1000 و 1500 ppm)­ با روش مهار رادیکال آزاد DPPH اندازه گیری شد. نتایج نشان داد در هر دو عصاره با افزایش غلظت عصاره فعالیت آنتی اکسیدانی افزایش می یابد.  عصاره­ها در غلظت 1000 ppm با آنتی اکسیدان سنتزی TBHQ اختلاف معنی دار آماری نداشتند و برای اضافه شدن به روغن آفتابگردان انتخاب شدند. پایداری حرارتی نمونه های روغن حاوی عصاره به صورت جداگانه و ترکیبی (1000 ppm) در دمای 180 درجه سانتیگراد ارزیابی شد. TBHQ در غلظت 100 ppm به عنوان استاندارد در کنار نمونه شاهد استفاده شد. نتایج نشان داد طی فرآیند سرخ کردن روغن اکسایش افزایش می­یابد. نمونه کنترل کمترین پایداری اکسایشی و نمونه حاوی عصاره ترکیبی بیشترین پایداری اکسایشی را نشان دادند. در نهایت افزودن 1000 ppm از عصاره ترکیبی می­تواند بهتر از 100 ppm از TBHQ در جلوگیری از اکسایش روغن آفتابگردان طی فرآیند سرخ کردن عمل نماید و بعنوان یک آنتی اکسیدان طبیعی جهت مصرف در روغن های خوراکی پیشنهاد می گردد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evaluation the separated and combined effect of Mentha aquatic extract in stabilizing of sunflower oil under thermal condition

نویسندگان [English]

  • reza Esmaeilzadeh kenari
  • maryam asnaashari
department of food sciences and technology,sari agricultural sciences and natural resources university
چکیده [English]

The extracts of Mentha aquatique by ultrasound assisted and maceration (ethanol: water (80:20)) extraction method were compared. The total phenolic content of extracts were obtained 45.16 mg GA/g and 51.92 mg GA/g Extract in maceration and ultrasound-assisted method respectively. The antioxidant activity of different concentration of extracts (50, 100, 250, 500, 1000 and 1500 ppm) were measured by DPPH radical scavenging method. The results shows that in both extracts by increasing in concentration of extract antioxidant activity were increased. Both extract at 1000 ppm of concentration have no significant statistical difference by TBHQ and they selected to add in sunflower oil. The thermal stability of samples containing separated and mixture extracts (1000 ppm) evaluated at 180 °C. TBHQ at 100 ppm served as standard besides the control. The results showed that during frying process oil oxidation were increased. Control sample had the least oxidative stability and sample containing mix extract showed the highest oxidative stability. Finally 1000 ppm of the mix extract could act better than 100 ppm TBHQ in inhibition of lipid oxidation in sunflower oil during frying process and it suggest as a natural antioxidant to use in edible oils.

کلیدواژه‌ها [English]

  • sunflower oil
  • Mentha aquatique extract
  • oxidation
  • Antioxidant
  • Ultrasound
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