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1、華南師范大學(xué)碩士學(xué)位論文聚乳酸載藥微米球、納米球的制備及其釋藥性能研究姓名:李良申請(qǐng)學(xué)位級(jí)別:碩士專業(yè):高分子化學(xué)與物理指導(dǎo)教師:李國(guó)明2003.6.1摘要本文首先采用二步法合成慨L)理聚乳酸(PLA),將合成出來的聚乳酸進(jìn)行了純化、分子囊弱突、紅羚激漤分輯、濺R讒蠶分拼愛p籬譜雯努瓣;討論了事酸駐錫靜髑蠹對(duì)聚乳酸的分予量的影響、重縭晶次數(shù)對(duì)聚乳酸分子爨的影響、分子擐與Tg之間關(guān)祭等。f籍栗襲弱在丙交酪靜開環(huán)聚會(huì)中,辱i發(fā)幫麓蓽俸酌魄鍘對(duì)漿乳酸酌分子蛩的大小熬決定性攙照,辛酸亞錫騭丙交醋的比例過離或過低,均必能德到較低分予量的聚襞酸,開環(huán)聚合反應(yīng)屬予逐步獺合反威,引發(fā)劑與單體的比例讖高
2、,活性點(diǎn)過多,不弱得至Ⅱ較高分子蠹靜聚襞黢。弓{發(fā)裁與攀髂戇斃攥過穩(wěn),涵注點(diǎn)過多,攀傣灘爨寵全發(fā)壘聚合。重結(jié)晶次數(shù)越多,單體的旋光性熊改善,純度得以提高,穰一定引發(fā)劑與單體配比條件下,PLA斡努予量犬棗蘑菇爨裂控懿∥再以制褥的PLA作為包裹材料,分別以利福平和鹽酸土霉索作為囊心物質(zhì),以o/w幫W/O褡爨揮茇法潮褥了聚藐蘩載蓊鐓豫,淫論7冪弱條籜對(duì)聚乳酸載蓊撇球翡彩褊,研究了聚乳酸分子盤、藥物食量、微球粒徑、釋放介質(zhì)pH俊等因素對(duì)微球釋藥性她的影嫡??s栗表鞠PLA勢(shì)子量犬較難驛解,其釋藥速率寢饅;菊含量較商,微球內(nèi)補(bǔ)藥物濃度梯度大,藥物蟪釋放較挾;徽璩的粒徑越小,釋蕊越快;夯質(zhì)墨堿性時(shí)聚
3、巍酸熬降簇較快,乖j福平的溶解度較大,釋藥粥快。最基運(yùn)精:晦璽竣毒}實(shí)酸{;差菱黃霉索雋囊·§凌愛期O/W溶熬揮發(fā)法裁備’r獲黃霉祟/聚乳酸納米球,并且分析比較丁載藥微米球和納米球的釋藥性能!結(jié)果表明所獲得的納米球琢影較好基羧秀努教,羧徑勢(shì)毒鞍蔑豫一,粒霰裁l14rim左右,經(jīng)綾瞧鼷擺窩量次重復(fù)試驗(yàn)得綜靜評(píng)分S為95.59,誤麓為3。66196,載藥攘(DL/%)為13.55%。載黼微米球的釋藥逮竄較慢,琵縭聚蠓在毪麓主膏~個(gè)。突躍靜,麓超騖“增溶”翁物靜籜需。④j/蒺鍵詞:聚乳酸;險(xiǎn)成:微米球;納米球;t釋煮妒√AbstractInthispaper,theD,Lpolylacfic
4、acid(PLA)wassynthesizedbythetwo·steppol蚴tion.Then讎PLA磷pufifizedandthemolecular酶戳WaSdetermined,強(qiáng)productwascharacteristizedbyusingIR,HNMRandDSCspectrum.TheinfluenceoftheamoBnt5ofoctoatcstannum011themolecular稍察,therecrystaltizationtimesonthemolecularweightandtherelafiomhipbetweenthemolecularweighta
5、ndTgWaSdiscussed.Thereschsshowedthatintheeou粼ofring-openingpolymerizationoflacfidctheratioofinitiatortomonomerwascriticaltothemolecularweightofPLA。Iftheratioofoctoatestaturetolactidewastoohi曲ortoolow,thehighmolecularweightPLAwouldbeunabletObegot,W玨越theratiooftheinitatortothemonomer懈toohigh,theac
6、tivatece蛾£囂wouldbetoomanyanditwashardtogetahighmolecularweightP∽whiletheratiooftheinitator協(xié)疆emonomer硒;3stoolowandtheactivatecenters萌瓣toofewandthemitwouldbehardtogetagreatmonomerconversion.Themorerecrystallizationtimesofrawlactide,thebetteritsopticala蠢vityandthenthehigheritspurity.Thereforeitwoul
7、dbeeas{er韜controlttheFLAmolecularweightbyraringthemolarratioofiniatortomonomer.ThePLAmicrospherccontaing姍orHydrochtorideOxytetracydine"waspreparedbyanoil-in-waterandwater-in-oilsolventevaporationmethodandthedifferentprocessc