| 研究生: |
郭蘋萱 Kuo, Pin-Hsuan |
|---|---|
| 論文名稱: |
多功能性超順磁氧化鐵奈米粒子的製備、鑑定與生醫應用 Preparation and characterization of multifunctional superparamagnetic iron oxide nanoparticles (SPIONs) for biomedical applications |
| 指導教授: |
許梅娟
Syu, Mei-Jywan |
| 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: | 83 |
| 中文關鍵詞: | 氧化鐵 、超順磁性 、多巴胺 、抗人類血清白蛋白抗體 、MRI顯影劑 、熱治療 、磁性免疫分離 |
| 外文關鍵詞: | iron oxide, superparamagnetism, dopamine, anti-human serum albumin antibody, MRI agent, hyperthermia, magnetic immune-separation |
| 相關次數: | 點閱:283 下載:0 |
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由於奈米化、特殊磁性、低毒性、高生物相容性與表面易於修飾之優勢,超順磁性氧化鐵奈米粒子 (superparamagnetic iron oxide nanoparticles, SPIONs) 於生醫領域的應用日漸廣泛;藉表面不同功能性配體 (ligand) 之修飾設計,可作為多功能載體用於藥物傳遞 (drug delivery)、標靶治療 (targeting therapy)、核磁共振顯影 (magnetic resonance imaging, MRI)、熱治療 (hyperyhermia) 與免疫偵測 (immunodetection) 上。
本研究以熱裂解法合成疏水性超順磁氧化鐵奈米粒子 (MNP),嘗試調整反應參數以尋求得到最佳粒子型態與尺寸分布;再以配體交換與EDC/NHS交聯反應在氧化鐵表面依序接上親水性多巴胺與抗人類血清白蛋白抗體。
多巴胺修飾之氧化鐵奈米粒子 (MNP@DA) 具備顯影與熱治療潛能,可作為一診療劑使用;抗體修飾之氧化鐵奈米粒子 (MNP@aHSA) 則可視為磁性免疫載體,搭配磁性分離與BCA檢測可感應偵測人類血清白蛋白,建構一套免疫檢測方法。各階段的氧化鐵奈米粒子皆以XRD、TEM、HRTEM、DLS、SQUID VSM檢測其物理性質;化學性的表面修飾藉FT-IR、ESCA驗證;估算修飾成份的重量比則使用TGA與BCA檢測;並分別針對其顯影、熱治療與免疫偵測之可行性進行評估。
比對資料庫標準圖譜確認氧化鐵成份為Fe3O4,初步裂解出之奈米氧化鐵為粒徑趨近均一之圓球形,彼此粒粒分明,單顆粒徑約15.6 ± 1.6 nm,水合力徑為21.40 nm;其晶形並不隨修飾而改變,但粒子隨修飾層增加而產生整體粒徑增長並成形粒子簇:MNP@DA粒徑約19.7 nm,MNP@aHSA約20.5 nm;受相轉換與修飾配體化學特徵的影響,水合粒徑則分別增加至299 nm與685 nm。表面修飾均為化學性鍵結之穩定結構;三種粒子在室溫下的飽和磁化量分別為71.89 emu/g、70.01 emu/g、60.97 emu/g。應用上,MNP@DA其r2 弛豫率在0.47 T磁場作用下可達475 mM-1s-1;且在30100 kHz、功率電流240 A的交流電磁場下使用約5 mg之劑量即可在5 min內將1 mL之水溶液加熱至治療溫度。MNP@aHSA則確實可作為磁性免疫載體使用,具備免疫分離人類血清白蛋白之功能。
With various surface-modified design, multifunctional superparamagnetic iron oxide nanoparticles (SPIONs) are potential to apply in drug delivery, targeting therapy, MR imaging, hyperthermia and immune-detection. In our research, SPIONs are fabricated and modified with different ligands, then test their imaging display, heating capability and the potential utilized in immune-separation. The magnetic nanoparticles (MNPs) synthesized by thermal decomposition were further reacted with hydrophilic dopamine (DA) and anti-human serum albumin antibody (aHSA) in sequence. After fabrication, a series of nanoparticles were characterized by X-ray diffractometer (XRD) and found their type was magnetite (Fe3O4). Chemical modifications were confirmed by Fourier transform infrared spectroscopy (FT-IR) and electron spectroscopy for chemical analysis (ESCA). From thermal gravimetric analysis (TGA), their weight composition was estimated. Under the ultrahigh resolution analytical electron microscope (HR-AEM) and the transmission electron microscope (TEM), the lattice, dispersity and spherical shape of nanoparticles were observed. The diameter of unit particle grew from 15.6 nm to 19.7 nm and 20.5 nm through surface modification. On the other hand, hydrodynamic sizes from dynamic light scattering (DLS) were 21.4 nm, 299 nm and 685 nm, respectively. Superparamagnetism was checked from the magnetic hysteresis curve, and their saturation magnetization under room temperature were 71.89 emu/g, 70.01 emu/g and 60.97 emu/g. Such high saturation magnetization made it express high r2 relaxivity, 475 mM‒1s‒1, and possible to heat a 1 mL water to therapeutic temperature 42oC in 5 minutes with a dose of 5 mg. Additionally, MNP@aHSA certainly has the capacity to bind human serum albumin (HSA) by magnetic immune-separation.
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