تاثیر بسته‌بندی پلی‌اتیلنی حاوی نانوذرات اکسید روی بر ماندگاری خرمای مضافتی

نویسندگان
1 موسسه آموزش عالی کار رفسنجان
2 دانشگاه شهید باهنر کرمان
3 دانشگاه شهید باهنر کرمان، کرمان
چکیده
میوه خرما، سرشار از ترکیبات قندی، مواد فیبری، برخی ویتامین‌ها، املاح معدنی و ترکیبات فنولی با خاصیت ضداکسایشی است. تغییرات فیزیکوشیمیایی، بیوشیمیایی و میکروبی رخ داده در این میوه در طی نگهداری سبب کاهش ویژگی‌های کیفی آن می‌گردد. در پژوهش حاضر تاثیر فیلم پلی‌اتیلنی حاوی 1 و 2 درصد نانوذرات اکسید روی به عنوان پوشش نانوکامپوزیتی و فیلم بدون نانوذرات به عنوان نمونه شاهد در حفظ برخی ویژگی‌های کیفی میوه خرمای مضافتی در دو دمای نگهداری 4 و 25 درجه سانتی‌گراد به مدت 120 روز ارزیابی گردید. نتایج تجزیه واریانس نشان داد که اثرات فیلم نانوکامپوزیتی، دما و زمان نگهداری بر شاخص‌های مورد بررسی نمونه‌های خرمای مضافتی معنی‌دار بود (p<0.05). کمترین تغییرات در شاخص‌های کیفی از قبیل افت وزن، pH، اسیدیته، مواد جامد محلول، محتوای فنول کل، محتوای قند کل و قندهای احیاء کننده در نمونه‌های خرمای قرار گرفته در فیلم نانوکامپوزیتی 2 درصد و نگهداری شده در دمای 4 درجه سانتی‌گراد مشاهده گردید. میزان این تغییرات در نمونه کنترل قرار گرفته در دمای ۲۵ درجه سانتی گراد به صورت معنی‌داری بیشتر از سایر نمونه‌ها بود. به علاوه، استفاده از بسته‌بندی نانوکامپوزیتی موجب کاهش سرعت رشد میکروبی (باکتری‌های معتدل‌دوست هوازی و کپک و مخمر) در مقایسه با نمونه شاهد گردید. با افزایش دمای نگهداری از 4 به 25 درجه ‌سانتی‌گراد روند افزایشی در رشد میکروبی و تغییر شاخص‌های کیفی تمام نمونه‌ها مشاهده شد که بیانگر کاهش ویژگی‌های کیفی خرما بود. با در نظر گرفتن شاخص‌های مورد بررسی، بسته‌بندی نانوکامپوزیتی حاوی 2 درصد اکسید روی عملکرد بهتری نسبت به بسته‌بندی نانوکامپوزیتی حاوی 1 درصد اکسید روی داشت. به طور کلی می‌توان استفاده از فیلم نانوکامپوزیتی حاوی 2 درصد نانوذرات اکسید روی را برای حفظ ویژگی‌های کیفی خرمای مضافتی در دمای نگهداری 4 درجه سانتی‌گراد پیشنهاد داد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Effect of polyethylene packaging containing zinc oxide nanoparticles on the shelf life of Mazafati date

نویسندگان English

Sajedeh Sadeghipour 1
Hamidreza Akhavan 2
Ahmad Shaker ardekani 1
Hosseini-Sadat Hosseini 3
1 Kar Higher Education Institute of Rafsanjan
2 Shahid Bahonar University of Kerman
3 Shahid Bahonar University of Kerman
چکیده English

Date fruit (Phoenix dactylifera L.) is a rich source of sugar, fiber, some vitamins, minerals and antioxidant phenolic compounds. The physico-chemical, biochemical and microbial changes occurring in this fruit reduce its quality properties during storage time. In the present study, the effects of polyethylene film containing 1 and 2% zinc oxide nanoparticles as nanocomposite packaging and film without nanoparticles as a control were evaluated in order to maintain some quality characteristics of Mazafati date fruit in two storage temperatures of 4 and 25 °C for 120 days. The results of analysis of variance showed that the effects of nanocomposite film, temperature and storage time on the studied parameters of Mazafati date were significant (p <0.05). The least changes in quality parameters of weight loss, pH, titratable acidity, total soluble solids, total phenolic content and total and reducing sugar contents were observed in date samples packed in 2% nanocomposite film stored at 4 °C. The change in control sample stored at 25 °C was significantly higher than other samples. In addition, the use of nanocomposite packaging reduced the microbial growth rate (total aerobic mesophilic bacteria, and mold and yeast) compared to the control sample. With increasing storage temperature from 4 to 25 °C, an increasing trend was observed in microbial growth and changes in the quality parameters of all samples, which indicated a decrease in the quality characteristics of the date fruit. Considering the studied parameters, nanocomposite packaging containing 2% zinc oxide had better performance than nanocomposite packaging containing 1% zinc oxide. In general, the use of nanocomposite film containing 2% zinc oxide nanoparticles is suggested to maintain the quality characteristics of Mazatifi dates at a temperature of 4 °C.

کلیدواژه‌ها English

Nanocomposite packaging
Zinc oxide
Mazafati date
shelf life
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