| 研究生: |
張邑亘 Zhang, Yi-Xuan |
|---|---|
| 論文名稱: |
酸鹼與還原應答之硫辛酸修飾聚賴氨酸及聚胜肽/二氧化矽複合水膠 pH- and Redox-Sensitive Lipoic Acid-Modified Poly(L-lysine) and Polypeptide/Silica Hybrid Hydrogels |
| 指導教授: |
詹正雄
Jan, Jeng-Shiung |
| 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: | 2016 |
| 畢業學年度: | 104 |
| 語文別: | 中文 |
| 論文頁數: | 45 |
| 中文關鍵詞: | 聚胜肽水膠 、酸鹼應答 、還原應答 、複合水膠 、二氧化矽 、藥物傳輸 |
| 外文關鍵詞: | polypeptide-based hydrogel, stimuli-sensitive, hybrid hydrogel |
| 相關次數: | 點閱:93 下載:3 |
| 分享至: |
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本研究利用環氧乙烷(ethylene oxide, EO)滅菌使硫辛酸修飾聚賴氨酸(lipoic acid grafted poly(L-lysine), PLL-g-Lipo)生成分子鏈之間的雙硫交聯結構,進而能夠吸水膨脹成聚胜肽水膠,而聚胜肽/二氧化矽複合水膠則是在聚胜肽水膠中加入甲氧基矽烷(tetramethyl orthosilicate, TMOS)作為二氧化矽前驅物製備而得。由於鏈與鏈間形成了雙硫鍵結(disulfide bond)與高分子鏈本身的纏繞行為(Entanglement),使得PLL-g-Lipo在很低的濃度就能夠成膠,透過掃描電子顯微鏡(scanning electron microscope, SEM)的觀察可發現其具有膜狀的網絡結構。聚胜肽與聚胜肽/二氧化矽複合水膠之力學性質會因高分子鏈長、硫辛酸接枝率以及水膠之組成(有機物與無機物的含量)而有所不同。在藥物包覆與釋放的實驗中發現,釋放速率可透過調整溶液之酸鹼值,以及加入穀胱甘肽(glutathione, GSH)製造出還原環境來控制,代表此種水膠具有酸鹼與還原雙重應答的性質。研究結果亦顯示出,二氧化矽的沉積不但可以穩定水膠的網絡結構、降低水膠之細胞毒性,也可以改變水膠的力學性質與藥物釋放行為。藉由適當的調控便可使此種水膠具有一定的穩定性與藥物釋放速率,因此具有作為藥物載體之潛力。
In this research, the preparation of dual stimuli-sensitive, biocompatible lipoic acid-modified poly(L-lysine) (PLL-g-Lipo) hydrogels/nanogels by chemical cross-link and polypeptide/silica hybrid hydrogels by depositing silica in the gel matrix. By ethylene oxide sterilization, hydrogels were prepared through the formation of inter-/intramolecular disulfide cross-link. Their mechanical properties and gelation were dictated by the amphiphilic nature and degree of inter-/intramolecular disulfide cross-link, which were influenced by the chain conformation. Upon changing the solution pH from neutral to acidic condition and/or cleaving disulfide bonds, these hydrogels showed redox- and pH-sensitive properties as demonstrated by the accelerated drug release. Silica deposition can stabilize the gel network and tune their mechanical properties as well as their payload release and colloidal properties.
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