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1、天津大學(xué)碩士學(xué)位論文膽固醇疏水改性葡聚糖聚乳酸雜化囊泡的形成機(jī)理及藥物釋放研究姓名:張志華申請(qǐng)學(xué)位級(jí)別:碩士專(zhuān)業(yè):材料學(xué)(高分子)指導(dǎo)教師:原續(xù)波20060101ABSTRACTCholesterol3一hemisuccinylchloridewassynthesizedbycholesterolandsuccinicanhydrideinanhydrouspyridine,whichwascharacterizedbyinfrared

2、spectroscopycholesterolhydrophobicallymodifieddextran(DexCH)wasobtainedbyesterificationofdextrancholesterol3hemisuccinylchlorideusinganhydrousdimethylsulfoxide(DMSO)assolutionandterethylamineascatalyst,substituteddegreec

3、allbecontrolledbytheratiobetweendextranandcholesterol3hemisuccinate,theactualsubstituteddegreeWaSanalysizedby1HNMRspectraPoly(acrylicacid)andDexCHweredissolvedinDMSOincertainproportion,thendialysisagainstdeionizedwater,P

4、LA/DexCHvesicleWaspreparedFromtheexperiment,itindicatedthatthevesicleformationWashighlydependentontheproportionofPLAandDexCH,themolecularweightofPLAWas510ag/molanddextranwas4X104g/mol,substituteddegreeWas8%,whentheratioo

5、fPLAandDex—CHWasintherangeof1:7and2,vesiclestructurewasformed,whichCanbeobservedbyTransmissionElectronicMicroscopy(TEM)GadoliniumChloride(GaCl3),contrastmedium,couldincreasethevesiclecontrasts,intheconditionofhighermagni

6、ficationtime,thevesiclelayerWassandwichstructure;thefluorescencespectratechnologycanindicatetheexistenceofhydrophobicmicrodomainsIn1HNMRspectra,thesignalofPLAandcholesterolmoleculesweresignificantlybroadeningandlossinres

7、olutiondemonstratedthatthevesicleformationwascontrolledbyhydrophobiccomplexation,throughthatinteraction,PLAwasjustlikealongchainmoleculegraftedontodextranIndifferentproportionofPLAandDexCH,changethemolecularweightofPLA,v

8、esiclecouldformedinthemiddleproportion,andtherewerenelationshiptoPLAmolecularweight;thesubstituteddegreewere4%,8%,17%,26%,respectively,andchangethesubstituteddegree,vesiclestructurecouldbeformed,vesiclestructurecouldnotb

9、eformedinhigherorlowersubstituteddegree;dextranwithdifferentmolecularweight(sx104g/mol,105g/mol,3105g/mol,5X105g/m01),vesiclestructurecouldbeformed;vesiclestabilitycouldbeinvestigatedbyzetapotentialandturbidityThehydroph

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