تأثیر پوشش نانومرکب بر پایه کربوکسی‌متیل‌سلولز بر کیفیت داخلی و ریخت‌شناسی پوسته تخم‌مرغ طی دوره نگهداری در شرایط محیط
محورهای موضوعی : فصلنامه کیفیت و ماندگاری تولیدات کشاورزی و مواد غذایی
علی اکبر شریفی
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داریوش خادمی شورمستی
2
1 - کارشناس ارشد، گروه کشاورزی، واحد سوادکوه، دانشگاه آزاد اسلامی، سوادکوه، ایران
2 - استادیار، گروه کشاورزی، واحد سوادکوه، دانشگاه آزاد اسلامی، سوادکوه، ایران
کلید واژه: مونت‌موریلونیت, پوشش نانومرکب, کربوکسی‌متیل‌سلولز, زیست‌پلیمر, تخم‌مرغ,
چکیده مقاله :
به‌منظور بررسی تأثیر پوشش‌های خوراکی نانومرکب زیست‌تخریب‌پذیر بر پایه کربوکسی‌متیل‌سلولز بر کیفیت داخلی و ریخت‌شناسی سطح پوسته تخم‌مرغ خوراکی آزمایشی با 120 عدد تخم‌مرغ در قالب طرح کاملاً تصادفی با 4 تیمار و 3 تکرار اجرا شد. تیمارها شامل تخم‌مرغ‌های فاقد پوشش (شاهد)، تخم‌مرغ-های حاوی پوشش کربوکسی‌متیل‌سلولز، تخم‌مرغ‌های دارای پوشش کربوکسی‌متیل‌سلولز- اسید الئیک و تخم‌مرغ‌های دارای پوشش نانومرکب کربوکسی-متیل‌سلولز- اسید اولئیک- نانورس بودند. پوشش‌دهی به‌روش غوطه‌وری انجام شد و تخم‌مرغ‌ها به‌مدت 5 هفته در دمای محیط (1±25 درجه سانتی‌گراد) نگهداری شدند. فراسنجه‌های کیفیت داخلی در پایان هفته‌های 1، 3 و 5 و ریخت‌شناسی سطح پوسته در آغاز و پایان دوره آزمایشی ارزیابی شدند. نتایج نشان داد؛ تخم‌مرغ‌های حاوی پوشش نانومرکب در پایان دوره نگهداری دارای کمترین درصد افت وزنی و کمترین مقدار عددی اندیس اسید تیوباربیتوریک (05/0P<) و بیشترین مقدار عددی pH سفیده، بیشترین مقادیر عددی اندیس زرده و واحد هاو (05/0P<) بودند. ضمن اینکه سطح پوسته تخم‌مرغ‌های حاوی پوشش نانومرکب از یکپارچگی و پیوستگی بیشتر و خلل و فرج و شکستگی کمتری نسبت به گروه شاهد بود. لذا می‌توان از پوشش نانومرکب کربوکسی‌متیل‌سلولز- اسید اولئیک- نانورس به‌عنوان یک بسته‌بندی زیست‌سازگار جهت انبارمانی تخم‌مرغ در دمای محیط به‌مدت 5 هفته بدون تأثیر نامطلوب در کیفیت داخلی و پوسته استفاده کرد.
In order to investigate the effect of biodegradable nanocomposite edible coatings carboxymethylcellulose-based on the internal quality and morphology of the table eggshell surface an experimental with 120 eggs in a completely randomized design with 4 treatments and 3 replicates were performed. Treatments included uncoated eggs (control), eggs containing carboxymethylcellulose coating, eggs containing carboxymethylcellulose-oleic acid coating and eggs containing carboxymethylcellulose-oleic acid-nanoclay nanocomposite coating. Coating was done by immersion method and the eggs were stored at ambient temperature (25±1oc) for 5 weeks. Internal quality parameters were evaluated at the end of weeks 1, 3 and 5 and eggshell surface morphology at the beginning and end of the experimental period. The results showed that eggs containing nanocomposite coating at the end of storage period have the lowest percentage of weight loss and the lowest numerical value of thiobarbituric acid index (P <0.05) and the highest numerical value of albumen pH, the highest numerical values of yolk index and haugh units (P <0.05). In addition, the surface of the eggshell containing nanocomposite coating was more integrated and less porous and fractured than the control group. Therefore, the nanocomposite coating of carboxymethylcellulose-oleic acid-nanoclay can be used as a biocompatible packaging for storage eggs at ambient temperature for 5 weeks without adversely affecting the internal quality and eggshell.
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