پديد آورنده :
كثيري، نگار
عنوان :
توليد و ارزيابي ويژگي هاي فيزيكوشيميايي نانو كريستال سلولز توليد شده از پوست پسته و بررسي امكان استفاده از آن براي توليد امولسيون و ريز پوشاني نعناع فلفلي
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
علوم و صنايع غذايي
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي
صفحه شمار :
چهارده، 87ص.: مصور، جدول، نمودار
يادداشت :
ص. ع. به فارسي و انگليسي
استاد راهنما :
ميلاد فتحي
استاد داور :
جواد كرامت، محمدرضا سبزعليان
تاريخ ورود اطلاعات :
1395/10/28
چكيده انگليسي :
88 Production and Evaluation of Physicochemical Properties of Cellulose Nanocrystal from Pistachio Shell and Its Application for Pickering Emulsion and Peppermint Oil Encapsulation Negar Kasiri n kasiri@ag iut ac ir December 11 2016 Department of Food Science and Technology Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisor Milad Fathi mfathi@cc iut ac irAbstractNowdays aboundant agricultural waste is produced in Iran Pistachio is one of the most important crops inIran which is about 52 of pistachio world production in 2013 Pistachio shell is an agro waste withattractive source of cellulose that can be used to produce tiny and useful cellulose nanocrystals CNC Alkaliand bleaching treatments were performed on these pistachio shells to remove hemicellulose lignin and non cellulose components to purify cellulose The yield of cellulose extraction was 44 In order to obtaincellulose nanocrystals acid hydrolysis with H2SO4 and HCl were performed Acid hydrolysis with H2SO4damaged the crystalline regions and created amorphous structure from the beginning of the hydrolysis time Whiel HCl was a milder acid removed amorphous structures and produced CNCs Hydrolysis was performedunder different times 120 180 and 240 min and HCl concentrations 2 and 3 M at 100 with acid tocellulose ratio of 40 ml g under hydrothermal conditions to create cellulose nanocrystals with higher yield andlower size HCl with 3M concentration and hydrolysis reaction time of 180 min were recognized as theoptimum conditions to extract CNCs by the yield of 77 1 and crystallinity 79 4 Spherical nanoparticleswith mean diameter of 69 8 20 7 nm were observed by TEM analysis Chemical structure and thermalproperties of CNC were characterized by FTIR and TGA analysis According to FTIR analysis hemicelluloseand lignin were removed while the crystallinity index of CNCs were enhanced Also TGA analysisrepresented the decreases in thermal stability of CNCs Also the CNCs were used to stabilize 10 oil in wateremulsion By increasing the CNC concentration the stability of emulsions to heating stresses and longstorage enhanced while the mean diameter of oil droplets decreased On the other hand the CNCs were usedas a carrier to encapsulate peppermint oil By increasing the peppermint oil concentration 10 to 50 encapsulation efficiency increased from 18 to 44 The controlled release of CNC PO in simulated salivawas evaluated Chemical structure and crystallinity degree of CNCs after encapsulation were characterized The FTIR analysis showed the main peaks of peppermint oil in CNC PO spectra while the crystallinity indexwere decreased slightly after encapsulation The results of this study indicated that because of lowenvironmental impact of cellulose using these CNCs for emulsion preparation and bioactive encapsulation ispreferable Keywords Cellulose nanocrystal Emulsion Encapsulation Peppermint oil
استاد راهنما :
ميلاد فتحي
استاد داور :
جواد كرامت، محمدرضا سبزعليان
