بررسی اثر جریان الکتریکی بر ویژگی‌های مکانیکی و نفوذپذیری فیلم کیتوزان حاوی نانوذرات رس و نقره

نویسندگان
نیلوفر صفری ثانی 1
علی معتمدزادگان 2
جمشید فرمانی 2
جعفر محمدزاده میلانی 2
1 دانشجوی کارشناسی ارشد علوم و صنایع غذایی دانشگاه علوم کشاورزی و منابع طبیعی ساری.
2 دانشیار گروه علوم و صنایع غذایی، دانشگاه علوم کشاورزی و منابع طبیعی ساری.
10.52547/fsct.18.112.53
چکیده
فیلم­های برپایه کیتوزان خالص دارای معایب متعددی ازجمله ویژگی­های مکانیکی ضعیف و بازدارندگی کم در برابر رطوبت هستند که موجب محدودیت استفاده از آنها در بسته­بندی­های مواد غذایی می­شود. در این پژوهش، به­منظور بهبود ویژگی­های این فیلم از نانوپرکننده­هایی نظیر نانورس (M) و نانونقره (Ag) و همچنین اعمال جریان الکتریکی در طی خشک شدن فیلم­ها بهره گرفته شد. فیلم­های نانوکامپوزیتی برپایه کیتوزان، با افزودن چهار سطح 0، 1، 3 و 5% نانونقره و نانورس تهیه و به­منظور خشک کردن فیلم­ها از حرارت و جریان الکتریکی در چهار ولتاژ 0، 15، 30 و 60 به­طور هم­زمان استفاده شد و خصوصیات آنها از جمله نفوذپذیری به بخار آب و اکسیژن، خواص فیزیکی و مکانیکی و ریزساختار مورد بررسی قرار گرفت. حضور نانوذرات سبب افزایش رطوبت، ضخامت و کدورت و بهبود WVP و O2P فیلم­های نانوکامپوزیت و همچنین خواص مکانیکی در مقایسه با فیلم کیتوزان خالص گردید. از طرفی غلظت 3% در هر دو تیمار، توانست ویژگی­های نفوذپذیری و خواص مکانیکی را نسبت به سطوح 1 و 5% بهبود بخشد. اعمال جریان الکتریکی تاثیر معنی­داری بر درصد رطوبت، حلالیت و میزان ضخامت نداشت. در مقابل، استفاده از جریان­های الکتریکی با ولتاژ 30، سبب بهبود خواص مکانیکی، کدورت و WVP و ولتاژ 60، موجب بهبود O2P در نانوکامپوزیت­ها شد. تصاویر حاصل از SEM نشان داد، فیلم کیتوزان خالص دارای سطحی زبر و شکاف­های متعدد و سطح فیلم حاوی نانورس، نسبتا صاف و فشرده بود که امکان افزایش مقاومت کششی و خواص ممانعت کنندگی را فراهم می­کند. فیلم حاوی نانونقره نیز به­دلیل داشتن ساختاری پر پیچ و خم و دارای شکاف، میزان کدورت و خواص مکانیکی بیشتر و خواص ممانعت کنندگی کمتر از نانورس را دارا بود.
کلیدواژه‌ها
نانوکامپوزیت
کیتوزان
نانورس
نانونقره
جریان الکتریکی

موضوعات

عنوان مقاله English

Evaluation the effect of electricity flow on mechanical and permeability properties of chitosan film containing clay and silver nanoparticles

نویسندگان English

niloufar safarisani 1
Ali Motamedzadegan 2
Jamshid Farmani 2
Jafar Milani 2
1 M. Sc. Student, Department of Food Science & Technology, Sari Agricultural Sciences & Natural Resources University.
2 Associate Professor, Department of Food Science & Technology, Sari Agricultural Sciences & Natural Resources University.
چکیده English

Chitosan based films have several disadvantages, such as poor mechanical properties and low moisture deterioration, which limits their use in food packaging. In this study, nanomaterials such as nanoclay (M) and nanosilver (Ag) were used to improve the properties of the film whilst applying electrical current during film drying. Nanocomposite films based on chitosan, were prepared by adding four levels 0, 1, 3 and 5% silver and clay, then heat and electricity with 0, 15, 30 and 60 Voltage were simultaneously applied to dry them, finally their characteristics like including WVP, O2P, physical and mechanical properties, and microstructure were studied. The presence of nanoparticles in nanocomposite films increased the moisture, thickness, opacity, WVP, O2P and improved mechanical properties, incomparison with pure chitosan film. On the other hand, the concentration of 3% in both treatments improve the permeability and mechanical properties of the 1 and 5% levels. The application of electrical current had no significant effect on moisture content, solubility and thickness. In contrast, the use of electric current with a voltage of 30, improved mechanical properties, turbidity and WVP and a voltage of 60, improved O2P in nanocomposites. The images produced by the SEM show that the pure chitosan film has a rough surface and multiple gaps and the film surface of the nanoclay is relatively smooth and compact, which allows for increased tensile strength and inhibitory properties. The film containing nanosilver also had a more turbulent structure with a gap, turbidity and mechanical properties, and less inhibitory properties than nanoclay.

کلیدواژه‌ها English

Nanocomposite
Chitosan
Nanoclay
Nanosilver
electric current
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