Role of seaweed (Ulva flexuosa Wulfen) extract in improvement of postharvest quality of Washington navel orange fruits

Document Type : Research Paper


1 Former MSc Student, Department of Horticultural Science, Faculty of Agriculture and Natural Resource, University of Hormozgan, Bandar Abbas, Iran, I. R. Iran

2 َAssistant Professor, Department of Horticultural Science, Faculty of Agriculture and Natural Resource, University of Hormozgan, Bandar Abbas, Iran, I. R. Iran

3 Assistant Professor, Department of Horticultural Science, Faculty of Agriculture and Natural Resource, University of Hormozgan, Bandar Abbas, Iran, I. R. Iran

4 Department of Marine Biology, Faculty of Marine Sciences and Technology, University of Hormozgan, Bandar Abbas, Iran, I. R. Iran


Seaweeds are rich sources of bioactive natural products, which have been considered as potential biotic agents. Ulva flexuosa Wulfen is a species of seaweed which is endemic to the Persian Gulf. In this study, the effect of different concentrations of U. flexuosa extract on  the  antioxidant activity of Washington Navel orange (Citrus sinensis L. cv. Washington Navel) fruits (measured as free radical scavenging activity; FRSA) and postharvest quality of the fruits were evaluated under cold storage (5±1°C) conditions and 85-90% relative humidity up to 60 days. Results indicated that prolonging the storage time increased fruit weight loss, fruit decay and total soluble solids (TSS) contents of the fruits, while prolonging the storage time reduced the percentage of juice and ascorbic acid contents of the fruits. Postharvest quality and antioxidant activity of Washington Navel orange fruit improved significantly when they were immersed in seaweed extracts. The most effective treatment was 3.76 g L-1 concentration of Ulva flexuosa extract, which maximized the improvement of antioxidant capacity, ascorbic acid content and TSS during days of storage (DS). The results of this study indicated that the seaweed extract could be used as a new bioactive agent for maintaining the postharvest quality of orange fruit through enhancing the antioxidant activity.


Article Title [Persian]

تأثیر عصاره جلبک دریایی (Ulva flexuosa Wulfen) در بهبود کیفیت پس از برداشت پرتقال واشنگتن ناول

Authors [Persian]

  • محبوبه رضایی 1
  • فرزین عبدالهی 2
  • عبدالمجید میرزاعلیان دستجردی 3
  • مرتضی یوسف زادی 4
1 دانشجوی سابق کارشناسی ارشد گروه باغبانی دانشکده کشاورزی و منابع طبیعی، دانشگاه هرمزگان، بندرعباس، ج. ا. ایران
2 استادیار گروه باغبانی دانشکده کشاورزی و منابع طبیعی، دانشگاه هرمزگان، بندرعباس، ج. ا. ایران
3 استادیار گروه باغبانی دانشکده کشاورزی و منابع طبیعی، دانشگاه هرمزگان، بندرعباس، ج. ا. ایران
4 دانشیار گروه زیست دریا، دانشکده علوم و فنون دریایی، دانشگاه هرمزگان، بندرعباس، ج. ا. ایران
Abstract [Persian]

جلبک‌های دریایی حاوی یک منبع متنوع از ترکیبات غنی هستند که به عنوان ترکیبات بالقوه فعال زیستی مورد توجه قرار گرفته‌اند. این آزمایش برای بررسی اثر غلظت‌های مختلف عصاره جلبک دریایی Ulva  flexuosa Wulfen (بومی خلیج فارس) بر فعالیت آنتی اکسیدانی میوه پرتقال واشنگتن ناول و ویژگی‌های کیفی پس از برداشت میوه درشرایط نگهداری در انبارسرد (5±1) و رطوبت نسبی 90-85 درصد به مدت 60 روز انجام شد. نتایج این آزمایش نشان داد که با افزایش زمان انبارمانی، میزان کاهش وزن میوه، فساد میوه و کل مواد جامد محلول (TSS) افزایش در حالی که درصد آب میوه و آسکوربیک اسید میوه پرتقال کاهش یافت. با قراردادن میوه‌های پرتقال واشنگتن ناول در محلول عصاره جلبک، ویژگی‌های کیفی پس از پرداشت و فعالیت آنتی اکسیدانی بطور معنی‌دار افزایش یافت. غلظت 76/3 گرم در لیتر عصاره جلبک موثرترین غلظت در بهبود ظرفیت آنتی اکسیدانی، میزان آسکوربیک اسید و TSS در طول انبارمانی بود. در مجموع نتایج این پژوهش نشان داد که عصاره جلبک دریایی می‌تواند به عنوان یک ترکیب فعال زیستی جدید برای بهبود ویژگی‌های پس از برداشت میوه پرتقال از طریق افزایش فعالیت آنتی اکسیدان مورد استفاده قرار گیرد.

Keywords [Persian]

  • آسکوربیک اسید
  • ظرفیت حذف رادیکال‌های آزاد (FRSA)
  • انبارمانی میوه
  • کل مواد جامد محلول (TSS)
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