سنتز و بررسی خصوصیات فیزیکوشیمیایی و ضدمیکروبی بیونانوکامپوزیت‌های بر پایه بیوپلیمر کربوکسی‌متیل‌کیتوسان-نانورس مونتموریلونیت در حضور نانوذرات اکسیدتیتانیم

نویسندگان
حسین انور
حسین شیخ لوئی
دانشگاه آزاد اسلامی واحد مراغه
10.52547/fsct.18.112.283
چکیده
در این پژوهش، بیونانوکامپوزیت ضدمیکروبی بر پایه بیوپلیمر کربوکسی متیل کیتوسان-نانورس مونت‌موریلونیت در حضور نانوذرات اکسید تیتانیم سنتز شد. بررسی تصاویر مورفولوژی سطح شکست با میکروسکوپ الکترونی روبشی (SEM) نشان دهنده سطح زبر و ناهمگن بیونانوکامپوزیت‌ها در مقایسه با کربوکسی متیل‌کیتوسان خالص می‌باشد. نتایج آزمون پراش پرتو X نشان داد که نحوه پخش نانورس در حضور نانوذرات اکسید تیتانیم از ورقه‌ای کامل به ورقه‌ای بین‌لایه‌ای تغییر نموده است. افزودن نانوذرات اکسید تیتانیم باعث افزایش معنی‌داری (05/0p˂) کدورت در نانوکامپوزیت‌ها شد. تأثیر نانوذره اکسید تیتانیم بر کاهش مقدار باکتری گرم مثبت استافیلوکوکوس اورئوس بیش ازمقدار باکتری گرم منفی اشرشیاکلی است و با افزایش درصد نانوذره اکسید تیتانیم کارائی آن در حذف کلونی‌های هر دو باکتری بیشتر می‌شود. میزان انحلال‌پذیری در آب و نفوذپذیری نسبت یه بخاردر فیلم‌های بیونانوکامپوزیتی با افزایش درصد وزنی نانوذرات اکسیدتیتانیم کاهش بیشتری یافت. استحکام کششی فیلم‌های حاوی نانوذرات اکسیدتیتانیم بیشتر از استحکام کششی فیلم کربوکسی متیل کیتوسان خالص می‌باشد که از نظر آماری معنی‌دار است (05/0p˂). این تحقیق پتانسیل بالای بیونانو کامپوزیت را در جلوگیری از رشد باکتری‌های بیماری‌زا به اثبات رساند و نشان داد که می‌توان از چنین بسته‌بندی‌هایی برای افزایش عمر نگهداری مواد‌غذایی سود برد.
کلیدواژه‌ها
فیلم فعال
کربوکسی متیل‌کیتوسان
مونت‌موریلونیت
دی اکسید‌تیتانیم
خواص ضد میکروبی

موضوعات

عنوان مقاله English

Synthesis and Evaluation of Physicochemical and Antimicrobial Properties of Bionanocomposites Based on Carboxymethylchitosan Biopolymer - Montmorillonite Nanoclay in the Presence of TiO₂ Nanoparticles

نویسندگان English

Hossein Anvar
Hossein sheikhloie
Islamic Azad University, Maragheh branch
چکیده English

In this research, an antimicrobial bionanocomposites based on carboxymethyl chitosan biopolymer-montmorillonite nanoclay was synthesized in the presence of titanium oxide nanoparticles. Investigation of surface morphology images with scanning electron microscopy (SEM) shows the rough and heterogeneous surface of nanocomposites in comparison with pure carboxymethyl chitosan. The results of the XRD test showed that the diffusion of nanoclay in the presence of TiO2 nanoparticles changed from full sheets to between layers sheets. The addition of TiO2 nanoparticles caused a significant increase (p˂0.05) in turbidity in nanocomposites. The effect of TiO2 nanoparticles on reducing the amount of Gram-positive bacteria of Staphylococcus aureus is more than the effect of TiO2 nanoparticles on reducing the amount of gram-negative bacteria of Escherichia coli. By increasing the percentage of TiO2 nanoparticles, its efficacy in removing colonies of both bacteria is increased. Water solubility and Vapor permeability of nanobiocomposite films decreased with increasing weight percentage of TiO2. The tensile strength of the film containing TiO2 nanoparticles is more than the tensile strength of neat carboxymethyl chitosan film, which is statistically significant (p˂0.05). The study demonstrated the high potential of bionanocomposites in preventing the growth of pathogenic bacteria and showed that such packages could be used to increase the shelf-life of food.

کلیدواژه‌ها English

Active films
Carboxymethyl Chitosan
Montmorillonite
Titanium dioxide
Antimicrobial properties
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