تعیین ویژگی‌های شیمیایی و فعالیت ضدمیکروبی عصاره برگ زیتون بر باکتری‌های بیماری‌زا در شرایط برون‌تنی

نوع مقاله : مقاله پژوهشی فارسی

نویسندگان

• بهروز علیزاده بهبهانی ¹
• محمد نوشاد ¹
• مصطفی رحمتی جنیدآباد ²

¹ گروه علوم و مهندسی صنایع غذایی، دانشکده علوم دامی و صنایع غذایی، دانشگاه علوم کشاورزی و منابع طبیعی خوزستان، ملاثانی، ایران.

² گروه علوم و مهندسی باغبانی، دانشکده کشاورزی، دانشگاه علوم کشاورزی و منابع طبیعی خوزستان، ملاثانی، ایران

https://doi.org/10.22067/ifstrj.2022.74472.1130

چکیده

این مطالعه پژوهشی با هدف استخراج عصاره اتانولی برگ زیتون (Olea europaea) و بررسی ویژگی‌های آنتی‌اکسیدانی و ضدمیکروبی آن صورت گرفت. عصاره اتانولی برگ زیتون با کمک روش خیساندن تهیه شد و محتوای فنول و فلاونوئید کل بر اساس روش‌های رنگ‌سنجی معرف فولین- سیوکالتو و کلرید آلومینیوم اندازه‌گیری گردید. پتانسیل آنتی‌اکسیدانی عصاره با روش‌های مهار رادیکال آزاد DPPH و ABTS ارزیابی شد. علاوه بر این، فعالیت ضدمیکروبی عصاره اتانولی برگ زیتون در برابر باکتری‌های بیماری­زا (اشرشیا کلی، انتروباکتر ائروژنز، باسیلوس سرئوس و لیستریا اینوکوا) بر پایه روش‌های دیسک دیفیوژن آگار، چاهک آگار، حداقل غلظت مهارکنندگی و حداقل غلظت کشندگی تعیین گردید. عصاره اتانولی برگ زیتون حاوی mg GAE/g 72/0 ±58/176 فنول کل و
mg QE/g 26/0 ±85/69 فلاونوئید کل بود. علاوه بر این، عصاره اتانولی برگ زیتون قادر به مهار رادیکال‌های آزاد DPPH (59/0 ±62/70 درصد) و ABTS (43/0 ±15/76 درصد) بود. نتایج ضدمیکروبی نشان داد اثر ضدمیکروبی عصاره وابسته به غلظت آن و نوع باکتری است و باکتری‌های باسیلوس سرئوس و انتروباکتر ائروژنز به‌ترتیب حساس‌ترین و مقاوم‌ترین سویه‌های میکروبی در برابر عصاره اتانولی برگ زیتون بودند. به‌طور کلی، نتایج این مطالعه نشان داد که عصاره اتانولی برگ زیتون را می‌توان به‌عنوان ترکیب زیست فعال طبیعی با ویژگی‌های ضدمیکروبی و آنتی‌اکسیدانی بالا معرفی نمود.

کلیدواژه‌ها

• برگ زیتون
• عصاره اتانولی
• ضدمیکروب
• آنتی‌اکسیدان
• نگهدارنده طبیعی

موضوعات

• میکروبیولوژی مواد غذایی

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