تأثیر پارامترهای محلول برمورفولوژی وشکل‌گیری نانوالیاف الکتروریسی صمغ برگ گیاه آزی‌وش (Corchorus olitorius L) -پلی‌وینیل الکل

نویسندگان
1 دانشجوی کارشناسی ارشد مهندسی علوم و صنایع غذایی، دانشکده صنایع غذایی، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، گلستان، ایران
2 استاد گروه مهندسی صنایع غذایی، دانشکده صنایع غذایی، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گلستان، ایران
3 گروه شیمی مواد غذایی، دانشکده صنایع غذایی، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گلستان، ایران
4 دانشیار گروه شیمی مواد غذایی، دانشکده صنایع غذایی، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گلستان، ایران
5 عضو هیئت علمی موسسه غیر انتفاعی بهاران، گرگان، گلستان، ایران
چکیده
در پژوهش حاضر صمغ برگ گیاه آزی‌وش (Corchorus olitorius L) برای نخستین بار با کمک روش الکتروریسی در حضور پلی‌وینیل الکل به‌صورت نانوالیاف طبیعی مورد استفاده قرار گرفت. ابتدا اثر نسبت­های مختلف اختلاط محلول آبی صمغ آزی‌وش (G) در غلظت‌های مختلف (2، 5/2 و 3 گرم بر لیتر) با پلی‌وینیل الکل (P70:G30،P60:G40، P50:G50 و P0:G100) بر ویسکوزیته و هدایت الکتریکی به عنوان اصلی­ترین پارامتر­های محلول بررسی شد. نتایج نشان داد با افزایش غلظت صمغ و نسبت حجمی پلی‌وینیل الکل ویسکوزیته افزایش معنی­داری یافت (01/0p<). همچنین صرف ‌نظر از میزان غلظت صمغ آزی‌وش با افزایش نسبت صمغ به پلی‌وینیل الکل هدایت الکتریکی افزایش معنی­داری نشان داد (05/0p<). در بررسی تغییرات تنش برشی- نرخ برشی محلول‌های صمغ آزی‌وش و پلی‌وینیل الکل رفتار سودوپلاستیک تأیید شد. بررسی برازش داده‌های رئولوژیکی با مدل‌های هرشل بالکلی، قانون توان و کاسون نشان داد مدل هرشل بالکلی با بیش­ترین میزان R2/RMSE به شکل مطلوبی توصیف کننده رفتار جریان است و مقادیر اندیس جریان و ضریب قوام با مدل مذکورتعیین شدند. پس از الکتروریسی محلول­ صمغ آزی­وش-پلی‌وینیل الکل در شرایط ثابت دستگاهی (ولتاژ 18 کیلوولت، شدت جریان حجمی 7/0 میلی­لیتر بر ساعت و فاصله­ی سوزن تا صفحه جمع‌کننده 12 سانتی­متر) ، با بررسی ریزساختار و بر مبنای مورفولوژی فاقد گویچه فرمولاسیون صمغ آزی‌وش در غلظت 2 گرم بر لیتر و نسبت اختلاط 70:30 با پلی­وینیل الکل (P70:G30-C2) به‌عنوان مناسب‌ترین فرمولاسیون با میانگین قطر نانوالیاف90 نانومترانتخاب شد. بر اساس نتایج FTIR افزودن صمغ به پلی‌وینیل الکل سبب افزایش شدت باندها به دلیل ارتعاشات گلیکوزیدی گروه‌های کربونیل و هیدروکسیل گردید. همچنین پایداری حرارتی نانوالیاف صمغ‌ گیاه آزی‌وش در حضور پلی‌وینیل الکل افزایش یافت.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Effect of solution parameters on morphology and formation of electrospun nanofibers from Azivash (Corchorus olitorius L) leaf gum-polyvinyl alcohol

نویسندگان English

Seyedeh Zahra Hoseyni 1
Seid Mahdi Jafari 2
Hoda Shahiri Tabarestani 3
Mohammad Ghorbani 4
Elham Assadpour 5
1 MSc Student of Food Eng, Faculty of Food Science, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Golestan, Iran
2 Professor, Department of Food Engineering, Faculty of Food Science, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Golestan, Iran
3 Department of Food Chemistry, Faculty of Food Science, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Golestan, Iran
4 Associate Profesor, Department of Food Chemistry, Faculty of Food Science, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Golestan, Iran
5 Department of Food Science and Technology, Baharan Institute of Higher Education, Gorgan, Golestan, Iran
چکیده English

In the present study, Azivash leaf gum (Corchorus olitorius L.) was used for the first time with the help of an electroporation technique in the presence of poly-vinyl alcohol as a natural nanofibre. At first, the effect of different concentrations of Azivash gum aqueous solution (2, 2.5 and 3 g / l) with polyvinyl alcohol (P70: G30, P60: G40, P50: G50 and P0: G100) on viscosity and electrical conductivity as the main soluble parameters was studied. The results showed a significant increase in viscosity concentration with gum concentration and volume ratio of polyvinyl alcohol (p <0.01). Regardless of the concentration of Azivash gum, by increasing the ratio of gum to polyvinyl alcohol, the electrical conductivity increased significantly (p <0.05). In the study of shear stress-shear rate of Azivash gum and polyvinyl alcohol solutions, pseudoplastic behavior was confirmed. Investigating the fitting of rheological data with Herschel-Balkly models, power law and casson showed that the Herschel-Balkly model with the highest R2 / RMSE is desirable to describe the flow behavior. The values ​​of the flow index and consistency coefficient were determined by the model. After the electrospining of azivash leaf gum-polyvinyl alcohol in a constant condition (voltages of 18 kV, volumetric flow rate of 0.7 ml/hr and needle distance to a collector plate of 12 cm), by microstructure analysis and based on the morphology of bead-free fibres, the Azivash gum formulation at 2 g / L concentration and the mixing ratio of 70:30 with polyvinyl alcohol was selected as the most suitable formulation with a mean nanofiber diameter of 90 nm. Based on FTIR resulrs, addition of gum to polyvinyl alcohol caused an increase in peak intensity due to carbonyl and hydroxyl groups glycosidic vibrations. Also, the thermal stability of the gum nanofibers of Azivash improved in the presence of polyvinyl alcohol.

کلیدواژه‌ها English

Electrospinig
Nanofiber
Azivash plant (Corchorus olitorius L) Gum
Viscosity
Electrical conductivity
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