تأثیر زمان برداشت بر ظرفیت آنتی اکسیدانی و کیفیت نگهداری میوه کیوی رقم ‘هایوارد’

نویسندگان

1 استادیار گروه علوم باغبانی، دانشکده کشاورزی، دانشگاه گیلان، رشت

2 دانشجوی سابق کارشناسی ارشد، گروه باغبانی، دانشکده کشاورزی، دانشگاه آزاد اسلامی واحد کرج، کرج

3 دانشجوی دکتری گروه علوم باغبانی، دانشکده کشاورزی، دانشگاه گیلان، رشت

چکیده

زمان برداشت می تواند خصوصیات کیفی میوه کیوی را تحت تأثیر قرار دهد. این پژوهش در قالب طرح کاملاً تصادفی با سه تکرار در دانشکده علوم کشاورزی دانشگاه گیلان، در سال 1388 انجام گرفت. کاهش وزن، سفتی بافت، مواد جامد محلول (TSS)، اسید قابل تیتراسیون (TA)، اسید آسکوربیک، فنل کل و ظرفیت آنتی اکسیدانی میوه های کیوی رقم ‘هایوراد’ برداشت شده با درجه بریکس مختلف پس از چهار ماه انبارداری در دمای 5/0 درجه سانتی گراد، بررسی شد. نتایج نشان داد که میوه های برداشت شده با درجه بریکس بالاتر (بیشتر از 5/6) کاهش وزن بیشتری در پایان انبارداری نشان دادند. همچنین، سفتی بافت این میوه ها به طور معنی داری در پایان انبارداری کاهش یافت. تأخیر در برداشت باعث افزایش میزان TSS و TSS/TA میوه ها در پایان دوره انبارداری گردید. نتایج نشان داد که تأخیر در برداشت میوه های کیوی تا درجه بریکس 5/8 و نه، به ترتیب باعث افزایش معنی دار فنل کل و ویتامین ث در پایان چهار ماه انبارداری در دمای 5/0 درجه سانتی گراد گردید و پس از آن کاهش یافت، اما میوه هایی که با درجه بریکس 5/6 و نه برداشت شده بودند، نسبت به دیگر زمان های برداشت ظرفیت آنتی اکسیدانی بالاتری داشتند. درمجموع، تأخیر در برداشت باعث افزایش ترکیبات آنتی اکسیدانی میوه کیوی گردید، اما کیفیت نگهداری میوه را کاهش داد.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of harvesting time on antioxidant capacity and keeping quality of Actinidia deliciosa cv. Hayward fruit

نویسندگان [English]

  • Mahmoud Ghasemnejad 1
  • Roghayeh Ghorban Ali pour 2
  • Javad Fattahi Mohgaddam 3
چکیده [English]

Harvesting time of kiwifruit can influence quality characteristics. The current research was carried out according to a completely randomized design with three replications at Faculty of Agricultural Sciences, University of Guilan in 2009. Weight loss, flesh firmness, total soluble solid (TSS), titritable acidity (TA), ascorbic acid, total phenol content and antioxidant capacity of harvested fruit at different times was measured after four months storage at 0.5?C. The results showed that fruit weight loss was significantly increased at the end of storage time when fruits harvested with higher ?brix (more than 6.5). Furthermore, flesh firmness of these fruits was significantly reduced during storage. Delay in harvest was resulted to increase of TSS and TSS/TA. Data showed that total phenols and ascorbic acid increased significantly with delay in harvesting time up to 8.5 and nine °brix, respectively after four months storage at 0.5?C and thereafter declined, however antioxidant capacity was higher when fruits harvested with 6.5 and nine ?brix as compared with other harvesting times. Overall, although delay in harvest might increase antioxidant compounds in kiwifruit but reduced storage quality of fruits.

کلیدواژه‌ها [English]

  • antioxidant capacity
  • Ascorbic acid
  • harvesting time
  • Kiwifruit
  • total phenol

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