12001

11003

كارشناسي ارشد

علوم و صنايع غذايي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي

1395

سيزده، [75]ص.: مصور، جدول، نمودار

ص. ع. به فارسي و انگليسي

ميلاد فتحي

مهدي كديور، احمد ميره اي

1395/10/27

كتابنامه

كشاورزي

مهندسي كشاورزي

ID11003

Production and Evaluation of Physicochemical Properties of Vitamin A Loaded Cress Seed Mucilage Nanofiber Arezoo Fahami Arezoofahami@yahoo com 2 January 2017 Department of Food Science and Technology Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisor Milad Fathi mfathi@cc iut ac irAbstract Mucilage and hydrocolloids are hydrophilic biopolymers with high molecular weight and due to their functional properties are used as stabilizer emulsifier or in film formatting agent in food industries Recently biodegradable and biocompatible polymers are used in nanofiber formation Cress seed mucilage CSM is a new source of hydrocolloid and because of its inherited biodegradability and biocompatibility can be used in this field In this study CSM was used to fabricate nanofiber To obtain CSM the mucilage was extracted from cress seeds at pH 10 water seeds ratio 30 1 for 15 minutes and then freeze dried The viscosity and electrical conductivity of electrospun solutions were measured With increasing CSM in the solutions the viscosity and electrical conductivity were increased CSM 3 PVA 10 at different ratios 80 20 40 60 60 40 and 20 80 with voltage distances ratio of 18 17 and 23 17 kV CM were produced SEM analysis showed the effect of voltage and CSM PVA ratio on nanofiber diameters With increasing CSM ratio the diameters of nanofibers reduced whereas by increasing voltage nanofiber diameters increased CSM PVA nanofibers in the ratio of 60 40 and the mean diameter of 172 2 43 5 were recognized as the best sample and were used for further analysis FTIR analysis showed no interaction between CSM and PVA Amorphous structure of nanofibers verified by XRD analysis TGA analysis showed three thermal degradation steps for nanofibers and it was indicated that the thermal stability of CSM nanofiber was higher than CSM Vitamin A was encapsulated in CSM PVA 60 40 Encapsulation efficiency decreased from 99 to 97 and encapsulaiton load increased from 9 9 to 29 5 by increasing of vitamin A ratio Based on SEM results with encapsulation of vitamin A the nanofiber diameters increased from 172 2 43 50 to276 36 99 33 FTIR analysis verified the presence of main peaks of vitamin A without any reaction with CSM and PVA in nanofibers Crystalline structure of nanofiber encapsulated with vitamin A with the crystallinity of 55 was observed by XRD analysis TGA analysis showed that thermal resistance of encapsulated vitamin A was higher than non encapsulated vitamin A The release of vitamin A was analyzed in gastrointestinal media and showed higher release rate in intestine in comparison to gastric media Release modeling of vitamin A also performed and Hixson Crowell Kopcha and Ritger Peppas showed the best fitness with experimental data by having the highest amount of R2 MSE in gastric intestine and whole time of the release respectively Keywords Electrospinning Cress Seed Mucilage nanofibers Encapsulation Vitamin A

ميلاد فتحي

مهدي كديور، احمد ميره اي