پایش تغییرات فیزیکوشیمیایی تخم‌مرغ با پوشش نانوچندسازه‌ فعال حاوی عصاره سیر (Allium sativum L.) طی دوره انبارمانی

نویسندگان
گروه کشاورزی، واحد سوادکوه، دانشگاه آزاد اسلامی، سوادکوه، ایران
چکیده
تخم­مرغ یکی از منابع ارزان قیمت پروتئینی و در عین حال فسادپذیر است، لذا حفظ کیفیت داخلی آن طی دوره ذخیره­سازی اهمیت ویژه­ای دارد. تحقیق حاضر با هدف تأثیر پوشش نانو چندسازه­ای بر تغییرات فیزیکوشیمیایی تخم­مرغ طی دوره نگهداری به­مدت 4 هفته اجرا شد. تخم­مرغ­های فاقد پوشش (شاهد) و تخم­مرغ­های تیمار شده با پوشش دو سازه­ای پلی وینیل الکل/کیتوزان (PC)، فیلم سه سازه­ای پلی وینیل­الکل/کیتوزان/مونت­موریلونیت (PCM)، و فیلم­های PCM حاوی غلظت­های 2 و 4 درصد عصاره سیر در مجموع 5 تیمار و 3 تکرار در قالب طرح کاملاً تصادفی مورد ارزیابی قرار گرفت. نتایج نشان داد اثر ضدمیکروبی وابسته به غلظت عصاره سیر در برابر استافیلوکوکوس اورئوس بیشتر از اشرشیا کلی بود. فیلم­های تهیه شده نانو سه سازه­ای PCM فعال دارای ضخامت، استحکام کششی و مدول الاستیسیته بیشتر و حلالیت، کرنش و نفوذپذیری کمتر بودند (05/0p<). در پایان 4 هفته نگهداری، تخم­مرغ­های دارای پوشش نانو سه سازه­ای PCM فعال، پوسته ضخیم­تر (400/0 میلی­متر) و مستحکم­تر (310/0 کیلوگرم) داشته، موجب افت وزنی کمتر (حدود 4 درصد)، واحد هاو (00/70) و اندیس زرده (43/0) بالاتر و کمترین شمار باکتری کل (log cfu/ml 1/4) بودند. بنابراین می­توان از پوشش نانو سه سازه­ای PCM حاوی 4 درصد عصاره سیر به­عنوان بسته­بندی زیست تخریب­پذیر جهت حفظ کیفیت داخلی و پوسته تخم­مرغ و افزایش زمان نگهداری آن در دمای محیط استفاده کرد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Monitoring the physicochemical changes of eggs coated with active nanocomposite incorporating garlic extract (Allium sativum L.) during storage

نویسندگان English

Esmaeil Yousefi Zirabi
dariush khademi shurmasti
Dep. of Agriculture, Savadkooh Branch, Islamic Azad University, Savadkooh, Iran
چکیده English

Eggs are one of the low-cost sources of protein and are also perishable, so maintaining their internal quality during storage is particularly important. The current research was carried out with the aim of the effect of nanocomposite coating on the physicochemical changes of eggs during storage for 4 weeks. Uncoated eggs (control) and eggs treated with a two-component coating of polyvinyl alcohol/chitosan (PC), a three-component film of polyvinyl alcohol/chitosan/montmorillonite (PCM) ), and PCM films incorporating concentrations of 2 and 4% garlic extract were evaluated in a total of 5 treatments and 3 replicates in a completely randomized design. The results showed that the concentration-dependent antimicrobial effect of garlic extract was higher against Staphylococcus aureus than Escherichia coli. The prepared films of active three-component PCM nanocomposite had greater thickness, higher tensile strength, and elasticity, lower solubility, less elongation at break, and lower water vapor permeability (p<0.05). At the end of 4 weeks of storage, the eggs coated with active three-component PCM nanocomposites had a thicker shell (0.400 mm) and a stronger shell (0.310 kg), causing less weight loss (About 4 %), Haugh unit (70.00) and yolk index (0.43) were higher and the lowest of total viable count bacteria (4.1 log cfu/ml). Therefore, using the three-component PCM nano-coating containing 4% garlic extract as a biodegradable packaging is possible to maintain the internal quality and eggshell and increase its storage time at ambient temperature.

کلیدواژه‌ها English

Polyvinyl alcohol
Composite coating
Garlic extract (Allium sativum L.)
Chitosan
Nano
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