نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه کشاورزی گرگان

2 دانشگاه منابع طبیعی گرگان

چکیده

هیدروژل­ها شبکه سه بعدی زنجیره پلی­مری با توانایی جذب زیاد آب از طریق پیوندهای عرضی شیمیایی و فیزیکی می باشند. اخیرا گسترش هیدروژل­های زیستی با هدف کاهش استفاده از منابع فسیلی مورد توجه قرار گرفته است. آرد فیلتر گندم محصولی اجتناب ناپذیر از طبقه بندی آرد تحت سیستم پنوماتیک در صنعت مدرن آسیابانی گندم با قابلیت جذب آب و تولید فیلم های زیستی می باشد. از عیوب فیلم های هیدروژلی در صنایع بسته بندی می توان به شکنندگی، نفوذپذیری بالا نسبت به آب و مقاومت کم در برابر آب اشاره کرد. از این حیث هدف این تحقیق بررسی اثر غلظت کارواکرول (5 و 10 درصد نسبت به وزن پلی­مر) بر خواص فیزیکی و مکانیکی، ممانعت کنندگی،  سطحی و ضدباکتریایی فیلم هیدروژلی بر پایه آرد فیلتر بود. نتایج حاصل از این تحقیق نشان داد با افزایش غلظت کارواکرول در محلول فیلم سازی، ضخامت، مقاومت به کشش افزایش و رطوبت، حلالیت در آب و کشش­پذیری فیلم­های هیدروژلی کاهش یافت. منافد ریز متعددی در سطح فیلم های حاوی کارواکرول با استفاده از تصاویر میکروسکوپ الکترونی مورد تایید قرار گرفت. بیشترین نفوذ­پذیری نسبت به بخار آب (gm-1s-1Pa-110-10× 32/1) و کمترین حلالیت در آب (63/0±01/37 درصد) در فیلم هیدروژلی حاوی10درصد کارواکرول مشاهده شد. ارزیابی بخارات ترکیب فعال در فیلم هیدروژلی در محیط جامد نشان داد که کارواکرول علیه آسپرژیلوس نایجر ( بازدارندگی کامل رشد) در مقایسه اشرشیاکلای و لیستریامونوسایتوژنز برتری داشت. اندیس کاهش لگاریتمی کارواکرول در غلظت 5 درصد در فیلم هیدروژلی بر پایه آرد فیلتر گندم علیه اشرشیاکلای و لیستریامونوسایتوژنز به ترتیب 16/1 و 34/1 لگاریتمی بود. بیشترین کاهش اندیس لگاریتمی فیلم فعال هیدروژلی در غلظت 10 درصد کارواکرول علیه لیستریامونوسایتوژنز 71/2 مشاهده شد.

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