Improving fresh pistachio quality by postharvest application of edible coating during cold storage

Document Type : Research Paper

Authors

Department of Horticulture, Faculty of Agriculture, Vali-e-Asr University of Rafsajan, Rafsajan, Iran

Abstract

Fresh pistachio fruits of ‘Ahmad Aghaei’ variety were sprayed with 1% calcium oxide (CaO), 10 mM w/v γ-aminobutyric acid (GABA), 1% carboxymethyl cellulose (CMC), and their combination (CMC+GABA+CaO) for 30 s at room temperature. Spraying with distilled water was considered as the control. Following the drying of fruits at room temperature, they were packed in perforated polyethylene terephthalate and kept under cold storage (at 2 ± 1 ˚C with 85 ± 2% RH) for 75 d. The result showed that the fruit coated with CMC+GABA+CaO, CaO, and GABA exhibited the highest lightness index of the pistachio hulls compared to the control. The highest hue index of the hulls and carotenoids was observed in the fruits coated with CMC+GABA+CaO. The flavonoids in the fruits treated with CaO, GABA, and CMC were significantly higher than in other coatings. At the end of the cold storage, the fruits covered with CMC resulted in considerably higher lipid content than other coatings and the control. Pistachios treated with CMC+GABA+CaO showed lower H2O2 in hulls and kernels and the highest kernel carotenoid, and color indices than the control. In conclusion, the fruits coated with edible layers, especially with CMC+GABA+CaO, can be stored at 2±1 oC around 50 days to preserve the important traits of the pistachios.

Keywords


Article Title [Persian]

بهبود کیفیت پسته تازه در انبار سرد با کاربرد پس از برداشت پوشش خوراکی

Authors [Persian]

  • سیما افراشته
  • فاطمه ناظوری
  • سیدحسین میردهقان
گروه علوم و مهندسی باغبانی، دانشکده کشاورزی، دانشگاه ولی‌عصر رفسنجان، رفسنجان
Abstract [Persian]

میوه پسته تازه احمدآقایی با اکسید کلسیم  (Cao) 1%، گاماآمینو بوتریک اسید (GABA) 10 میلی مولار، کربوکسی متیل سلولز(CMC)  %1 و ترکیب آن ­ها (CMC +GABA+CaO)  به مدت ۳۰ ثانیه در دمای اتاق مه ­پاشی شدند. مه ­پاشی با آب مقطر به عنوان تیمار شاهد در نظر گرفته شد. میوه­ ها پس از خشک شدن در دمای اتاق در ظروف پلی اتیلن سوراخ دار با چگالی کم بسته بندی شدند و به مدت ۷۵ روز در انبار سرد (در دمای ۱±۲ درجه سانتی گراد با رطوبت 2±85) نگهداری شدند. نتایج نشان داد که میوه­ های پوشش داده شده با CaO ،GABA و CMC+GABA+CaO بالاترین شاخص درخشندگی پوست پسته را نسبت به سایر پوشش ­ها نشان دادند. بیشترین کارتنوئید و شاخص رنگ پوست در میوه­ های پوشش داده شده با  CMC+GABA+CaO  نشان داده شد. فلاونوئیدها در میوه­ های تیمار شده  با GABA، CaO و CMC به طور معنی ­داری بیشتر از سایر تیمارها بود. در پایان دوره انبارمانی، میوه­ های پوشش­ دار شده با CMC در مقایسه با سایر مواد پوشش دهنده و شاهد، افزایش قابل توجه محتوای لیپید را نشان دادند. پسته­ های تیمار شده با CMC+GABA+CaO دارای کمترین مقدار پراکسید هیدروژن پوست و مغز و بالاترین کاروتنوئید و شاخص رنگ مغز نسبت به شاهد بودند. به طور کلی، میوه‌های پوشیده شده با لایه‌های خوراکی، به‌ویژه با CMC+GABA+CaO، را می‌توان در حدود 50 روز در دمای 1±2 درجه سانتی‌گراد با حفظ ویژگی­ های مهم پسته، نگهداری کرد.
 

Keywords [Persian]

  • پوسیدگی میوه
  • شاخص رنگ
  • کاروتنوئید
  • فلاونوئید
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