研究生: |
黎元中 Yung-Chung Li |
---|---|
論文名稱: |
光交聯聚乳酸-聚乙二醇-聚乳酸三團聯共聚物之水膠奈米粒子 The study of photocrosslinked poly(D,L-lactic acid-ethylene glycol-D,L-lactic acid) diacrylate nanogel |
指導教授: |
朱一民
I-Ming Chu |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
工學院 - 化學工程學系 Department of Chemical Engineering |
論文出版年: | 2004 |
畢業學年度: | 92 |
語文別: | 中文 |
論文頁數: | 60 |
中文關鍵詞: | 光交聯 、聚乳酸 、聚乙二醇 、奈米水膠 |
外文關鍵詞: | photocrosslinked, poly(lactic acid), poly(ethylene glycol), nanogel |
相關次數: | 點閱:2 下載:0 |
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近十年來,利用光交聯(photocrosslinking)的方式去製備水膠,一直被認為是一個簡單又比較不會殘留毒性單體的方法。此外,又因為水膠的澎潤性質、高通透性與高生物相容性,使得水膠在組織工程方面有相當多的應用,例如:組織表面貼附型材料[6]、藥物控制釋放系統[7]、軟骨再生所需的鷹架(scaffold)材料[8]與牙科,整形外科所需的材料[9]等等。此外,透過生醫與奈米技術的結合,做為藥物制放系統的載體粒子微小化,接觸表面積增加而大幅提高療效,同時也因減少使用劑量及隔絕與正常細胞之接觸而降低其副作用[54]。
本研究內容是先製備出具有生物可分解性、高生物相容性的及親疏水性的PDLLA41-PEG4K-PDLLA41 diacrylate之後,使其在micelle的排列方式下進行光交聯反應。透過高強度UV燈的照射,micelle核心部分的PLA鏈段會進行free radical photocrosslinking,而彼此交聯成網狀結構,進而從micelle的排列方式變成nanogel,具有較一般micelle高的穩定性。本研究除探討nanogel的粒徑大小、膨潤性質、熱性質及穩定性之外,更嘗試使用此材料去包覆Camptothecin(CPT),以提供包覆藥物性質跟藥物釋放等資訊。
本研究製備出的nanogels除了具備有生物可分解性、高生物相容性更具備有高穩定性,而且透過改變交聯劑EGDMA的添加量(3 wt% ~ 50 wt%)或是UV燈照射的時間,便能簡單地控制水膠粒子的大小在150∼250 nm之間,上述特點在作為藥物制放系統上是一大優勢。在包覆CPT的應用上,各組成的nanogel均有約80%的包覆效率(entrapped CPT/loaded CPT),而且nanogel在包覆藥物前後粒徑大小並無明顯變化。至於CPT的釋放實驗方面,初步結果顯示,在20天的釋藥實驗過程中,不同組成的nanogel均能夠穩定、緩慢地釋放出CPT(在第20天時,各組釋放比率為:A=0.08,B=0.05,C=0.03,D=0.018,E=0.008),而且各個組成的nanogel在包覆CPT之後,不論是保存在4℃或室溫下仍具有相當高的穩定性。再者,隨著EGDMA添加量的增加(3 wt% □50 wt%),交聯密度隨之提升,nanogel球體內部網狀結構排列更為緻密,CPT釋出的速率也更加緩慢,此現象在控制釋藥速率方面是一項很重要的依據,更是劑型最適化的參考。本研究所開發出之nanogel包覆CPT的劑型很有可能成為一個穩定、緩慢釋放的劑型,當然這都要視未來進一步的實驗確認。
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