با همکاری انجمن علوم و صنایع غذایی ایران

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه علوم کشاورزی و منابع طبیعی گرگان

2 دانشگاه آزاد اسلامی واحد آزادشهر

3 بخش تحقیق و توسعه کارخانی آرد صنعتی هفشجان

4 دانشگاه تربیت مدرس

چکیده

گل مغربی (Oenothera biennis L.) نوعی گیاه علفی دو ساله است که عمدتا به دلیل حضور درصد بالایی گامالینولنیک اسید در روغن حاصل از بذر این گیاه به منظور استفاده در ترکیبات دارویی کشت می شود. در این پژوهش، مقدار ترکیبات فنولی، فلاونوئیدی، فعالیت آنتی اکسیدانی و ضد میکروبی عصاره های استونی (70 درصد)، اتانولی (70 درصد) و متانولی (70 درصد) گل گیاه گل مغربی مورد ارزیابی قرار گرفت. نتایج نشان داد، عصاره استونی بیشترین مقدار ترکیبات فنولی، فلاونوئیدی و بازدهی استخراج را دارا می باشد. فعالیت آنتی اکسیدانی عصاره های فنولی با آزمون های مهار رادیکال های آزاد DPPH و قدرت احیاء کنندگی یون های Fe+3 بررسی و با آنتی اکسیدان سنتزی BHT مقایسه گردید. در هر دو آزمون، بیشترین فعالیت به ترتیب مربوط به BHT، عصاره استونی، اتانولی و متانولی حاصل بود. عصاره های فنولی فعالیت ضد میکروبی قابل ملاحظه ای در مقابل تمامی باکتری های مورد بررسی نشان دادند و تاثیر عصاره ها بر باکتری های گرم مثبت بیشتر از باکتری های گرم منفی بود. در میان باکتری های مورد مطالعه، سالمونلا تیفی موریوم بیشترین مقاومت را به عصاره های استونی و اتانولی نشان داد. مقدار MBC عصاره استونی و اتانولی در مورد این باکتری به ترتیب برابر با 10 و 20 میکرو گرم در میلی لیتر بود.

کلیدواژه‌ها

عنوان مقاله [English]

Evaluating Antioxidant and Antimicrobial Activities of Phenolic Essences Extracted from Evening Primrose (Oenothera biennis) Flowers

نویسندگان [English]

  • Vida Mardani Ghahfarokhi 1
  • Mehran Alami 1
  • Saeedeh Arabshahi- Delouee 2
  • Rasul Khoda Bakhshi 3
  • Maryam Ghaderi 4

1 Gorgan University of Agricultural Sciences and Natural Resources

2 Islamic Azad University, Azadshahr Branch

3 Research and development department of Hafshjan industrial flour factory

4 Tarbiat Modares University

چکیده [English]

Evening primrose (Oenothera biennis) is a biennial flowering plant increasingly cultivated for medicinal use of γ-linolenic acid rich oil of its seeds. In this study, total phenolic and flavonoids content, antioxidant and antimicrobial activity of aceton, ethanolic and metanolic extracts of evening primrose flowers were evaluated. Aceton extract had the highest extraction yield, total phenol and flavonoids content. Extracts were also tested for their antioxidant activity using scavenging activity of 2,2- diphenyl-1-picrylhydrazyl and reducing power of Fe+3 in comparision with BHT. BHT was the highest in DPPH radical scavenging and reducing power followed by aceton, ethanolic and methanolic extracts. The extracts also showed good antibacterial activity against all of tested microorganism and the tested gram-negative bacteria was more resistant to inhibitory effect of extracts. Among different bacteria tested, Salmonella. typhimurium was found to be the most resistant to aceton and ethanolic extracts. The MBC values, with respect to aceton and ethanolic extracts for Salmonella. typhimurium were 10 and 20 (μg/ml), respectively

کلیدواژه‌ها [English]

  • Evening primrose
  • Phenolic extract
  • Antimicrobial activity
  • Antioxidant activity
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