تاثیر افزودن کربوکسی‌متیل‌سلولز و مونت‌موریلونیت بر خواص فیزیکی-شیمیایی و حرارتی فیلم زیست‌تخریب‌پذیر موسیلاژ دانه ریحان

نویسندگان
مرضیه قمی مرزدشتی 1
یونس زاهدی 2
1 دانش‌آموخته کارشناسی ارشد علوم و مهندسی صنایع غذایی، دانشگاه محقق اردبیلی، اردبیل، ایران
2 دانشیار گروه علوم و مهندسی صنایع غذایی، دانشگاه محقق اردبیلی، اردبیل، ایران.
10.22034/FSCT.20.145.74
چکیده
هدف از این مطالعه بهینه­ سازی و بهبود خواص بیوپلیمر بر پایه موسیلاژ دانه ریحان و کربوکسی­متیل سلولز (100، 5/162 و 225 درصد وزنی موسیلاژ) با استفاده از نانو رس (صفر و 8 درصد وزنی موسیلاژ) و با بهره­گیری از روش تولید قالب­گیری بود. پس از تهیه ضخامت، رطوبت، دانسیته، خواص مکانیکی، طیف‌سنجی مادون قرمز تبدیل فوریه (FTIR) و وزن سنجی حرارتی (TGA) در فیلم­ها اندازه‌‌گیری شد. نتایج نشان داد که ضخامت و دانسیته فیلم خالص BSM بصورت معنی داری تحت تاثیر اضافه شدن CMC و MMT قرار نگرفتند (05/0<p) ولی مقدار رطوبت با افزایش غلظت CMC روند کاهشی به خود گرفت (05/0>p) در حالیکه حضور MMT روی این پارامتر بی تاثیر بود. استفاده از CMC و MMT باعث افزایش مقاومت به کشش نهایی و همچنین ازدیاد طول تا نقطه پارگی نانوکامپوزیتها شد بگونه­ای که بیشترین مقاومت کششی و ازدیاد طول در نقطه پارگی به ترتیب به میزان 9/27 MPa و 41 % برای نانوکامپوزیت حاوی 8% MMT و 225% CMC حاصل شد. نتایج FTIR حاکی از این بود که فعل و انفعالات شیمیایی خاصی که منجر به تولید ترکیبات جدید شود اتفاق نیفتاده است و فقط شدت و ضعف پیک­های جذبی تا حدی تغییر کرده و در مواردی نیز طول­مو­ج­های پیک­های جذبی بصورت جزئی تغییرمکان داده­اند. نتایج TGA نشان داد افزودنCMC و MMT سب بهبود مقاومت حرارتی فیلمها می شود. در مجموع، نتایج اندازه­گیری­ها حاکی از تاثیر مثبت CMC و MMT روی فیلم BSM بود و تیمار حاوی MMT و بیشینه غلظت CMC را می­توان به عنوان فیلمی با ویژگیهای بهتر برای استفاده در بسته بندی توصیه نمود.
کلیدواژه‌ها
نانوکامپوزیت
زیست تخریب پذیری
بسته بندی مواد غذایی

موضوعات

عنوان مقاله English

Effect of carboxymethyl cellulose and montmorillonite addition on the physicochemical and thermal properties of basil seed mucilage-based biodegradable film

نویسندگان English

Marzieh Qomi Marzdashti 1
Younes Zahedi 2
1 Department of Food Science & Technology, University of Mohaghegh Ardabili, Ardabil
2 Associate professor, Department of Food Science & Technology, University of Mohaghegh Ardabili, Ardabil, Iran.
چکیده English

The aim of this study was optimization and improvement of the physic-chemical characteristics films based on basil seed mucilage (BSM) and carboxymethyl cellulose (CMC) (100, 162.5 and 225% w/w the mucilage) using montmorillonite (MMT) (0 and 8% w/w the mucilage) by casting method. The produced films properties were evaluated for thickness, moisture content, density, mechanical properties, Fourier Transform Infrared Spectrometer (FTIR), and thermogravimetric analysis (TGA). Results indicated that thickness and density of the films were not significantly influenced by CMC and MMT addition (p>0.05), but the moisture content of nanocomposites decreased with increasing CMC content (p<0.05). Presence of CMC and MMT in the film matrix caused to enhancement of ultimate tensile strength (UTS) and elongation at break (EB) in nanocomposites; the maximum of UTS and EB with the values of 27.9 MPa and 41%, respectively, were obtained for the nanocomposite made by 225% CMC and 8% MMT. FTIR spectra revealed no new compounds resultant from the chemical interactions, and only some shifts were observed for some peaks, and also slightly weakening or intensifying in several peaks. TGA plots showed that incorporation of CMC and MMT led to improvement of thermal properties. In conclusion, simultaneous loading of nanoclay and CMC generated the improved nanocomposites, and the treatment loaded with both MMT and the maximum level of CMC (T7) is advised as the best film for employing in the food packaging.

کلیدواژه‌ها English

Nanocomposite
biodegradability
Food packaging
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