تأثیر پوشش نانوامولسیون حاوی کیتوزان بر افزایش ماندگاری سیب گلاب رقم گلاب کهنز در مدت انبارداری

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناسی ارشد، گروه علوم وصنایع غذایی، دانشکده کشاورزی و منابع طبیعی،دانشگاه آزاد اسلامی،واحدعلوم و تحقیقات یزد

2 دانشیار پژوهش بخش تحقیقات مهندسی صنایع غذایی و فناوری پس از برداشت، موسسه تحقیقات فنی و مهندسی کشاورزی، ایران

3 استادیار، گروه مهندسی علوم و صنایع غذایی، دانشکده کشاورزی و منابع طبیعی دانشگاه آزاد اسلامی،واحدعلوم و تحقیقات یزد

چکیده

در این پژوهش کارایی نوعی پوشش خوراکی نانوامولسیونی حاوی کیتوزان با هدف افزایش زمان نگه‏داری سیب رقم گلاب کهنز بررسی شد. سیب پس از برداشت با پوشش نانوامولسیون بر پایۀ کیتوزان در غلظت‏ 2000 قسمت در میلیون، پوشش‌دهی و به‏همراه نمونه‏های شاهد در دمای 1±2 درجۀ سانتی‏گراد و در رطوبت نسبی 80-85 درصد نگهداری شد. در مدت 10 هفته نگهداری در فواصل زمانی مشخص (هر هفته یکبار) سفتی بافت، فعالیت آنزیم پلی‏فنل اکسیداز، رنگ پوست و گوشت، خواص حسی، و میزان تنفس براساس میزان CO2 تولیدشدۀ سیب‏های نگهداری‏شده اندازه‏گیری شد. نتایج نشان دادند که پوشش خوراکی بر پایۀ نانوامولسیون کیتوزان اثر معنی‏داری بر سفتی بافت و خواص حسی میوه ندارد. کاربرد پوشش حداکثر شدت تنفس را به نصف کاهش داد و پوشش به‏طور معنی‏داری باعث کاهش اوج تنفسی سیب شد. در میوه‏های بدون پوشش پس از مرحلۀ اوج تنفسی، میزان فعالیت آنزیم پلی‏فنل‏اکسیداز افزایش نشان داد که همراه با گسترش قهوه‏ای‏شدگی بافت میوه بود. به‏طور‏کلی این پوشش عمر انباری سیب را افزایش و ضایعات کمّی و کیفی آن را در مدت نگهداری کاهش داد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The Effect of Chitosan-Based Nano-Emulsion Coating on Extending the Shelf Life of Apple var. Golab Kohanz

نویسندگان [English]

  • Ali Sahraei Khosh Gardesh 1
  • Fojan Badii 2
  • Ali Yasini Ardakani 3
1 MSc Graduate, Department of Food Science and Technology, College of Agriculture and Natural Resources, Yazd Science and Research Branch, Islamic Azad University
2 Associate Professor, Department of Food Engineering and Postharvest Technology, Agricultural Engineering Research Institute
3 Assistant Professor, Department of Food Science and Technology, College of Agriculture and Natural Resources, Yazd Science and Research Branch, Islamic Azad University
چکیده [English]

The effects of a nano-emulsion chitosan-based coating on enhancing the shelf-life and quality of Golab Kohanz apples were studied. The nano-emulsion coating containing Chitosan with a concentration of 2000 ppm was applied for coating of Golab Kohanz apples. Coated and uncoated apples were packed in normal packaging cardboards and kept at 2 ± 1 °C with a relative humidity within 80-85%. Flesh firmness, the activity of polyphenol oxidase, flesh and skin colors, the rate of respiration based on the level of CO2 produced and the sensory characteristics of the coated vs. uncoated apples were recorded during a ten week of storage period at some specified intervals of one week. The results indicated that the coatings had no significant effect on flesh firmness and sensory characteristics of the apples, while the respiration rate of the coated apples decreased up to 50% with the coating lowering the respiration peak significantly. The polyphenol oxidase activity and the browning of the flesh increased significantly in uncoated apples following the respiration peak. Overall, results showed that the nano-emulsion chitosan-based coating can help increase the storage life of the apple.

کلیدواژه‌ها [English]

  • Nano-emulsion Chitosan-based coating
  • Flesh firmness
  • Golab Kohanz apple
  • respiration rate
  • polyphenol oxidase
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