研究生: |
王詠毅 Yung-Yi Wang |
---|---|
論文名稱: |
紫膜生物光電晶片之 類風溼性關節炎檢測應用與原子力顯微鏡分析 Rheumatoid arthritis detection application of purple membrane-based photoelectric chips and AFM analysis |
指導教授: |
陳秀美
Hsiu-Mei Chen |
口試委員: |
林景堉
蔡伸隆 |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 化學工程系 Department of Chemical Engineering |
論文出版年: | 2018 |
畢業學年度: | 106 |
語文別: | 中文 |
論文頁數: | 106 |
中文關鍵詞: | 紫膜 、生物晶片 、類風溼性關節炎檢測 、原子力顯微鏡 |
外文關鍵詞: | purple membrane, photoelectric chips, Rheumatoid arthritis detection, atomic force microscopy |
相關次數: | 點閱:386 下載:0 |
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細菌視紫質 (bacteriorhodopsin)是一種存在於紫膜 (purple membrane, PM) 中的特殊光敏感蛋白,具有光質子驅動幫浦功能,受到光照後會使質子從膜內傳送到膜外,進而啟動ATP合成,可用以產生光電流;本實驗室過去已利用此特性製作PM光電感測晶片。本研究主要分為兩個部分,首先,就先前使用異型與同型雙官能基兩種不同架橋所分別製作的aptamer-PM與protein A-PM複合晶片,利用原子力顯微鏡分析其表面形貌,結果發現在PM晶片上以前者架橋所塗覆的aptamer覆蓋率比以後者架橋所塗覆的protein A高。其次,利用PM晶片檢測類風溼性關節炎。以具有特定序列之胜肽當作辨識分子以同型雙官能基架橋固定化在PM晶片上後可直接捕捉血清中的抗體,再以標記有奈米金之抗人體IgA抗體來偵測被捕捉的IgA。具有遮光性的奈米金可增加PM檢測晶片的光電流下降程度,即增加靈敏度。研究中探討胜肽固定化濃度、血清稀釋倍率、以及抗IgA抗體與奈米金複合物之稀釋倍率對晶片檢測成效的影響,以決定晶片製程與檢測的最適化條件。最後分別利用20位常人以及20位類風濕性關節炎患者之血清,以所製備的胜肽-PM晶片進行檢測,並就晶片的光電流下降比例做比較,結果發現以二組不同檢體檢測的晶片光電流下降平均值具有明顯差異 (p =1.4×10-12),可訂出分界線,因此本研究證實PM晶片可被應用於類風溼性關節炎檢測。
Bacteriorhodopsin is a special light-sensitive protein in purple membranes (PM) with a light-driven proton pump function. Upon illumination, it transports a proton from the cytoplasmic to the extracellular side of PM and thus drives ATP synthesis. The generated proton gradient can power photocurrents, which has been used to develop PM-based photoelectric sensors in this laboratory. This thesis contains two parts. First, atomic force microscopy was used to examine the surface morphology of the aptamer-PM and protein A-PM composite chips whose preparations have been previously developed using heterobifunctional and homobifunctional crosslinkers, respectively, for conjugation on PM-coated chips. The results showed aptamers had a better coverage on PM chips than protein A did. Secondary, PM chips were applied to detect rheumatoid arthritis. A peptide with a specific sequence was first immobilized on PM chips via the homobifunctional crosslinker, and the resulting sensor chips were subsequently used to directly adsorb antibodies in serum, followed by the labeling of the captured IgA using anti-human IgA antibodies conjugated with nanogold particles (AuNPs). AuNPs were employed to enhance the detection sensitivity due to their light-shielding effect. The optimization of peptide immobilization concentrations, serum dilution rates, as well as the dilution rates of the antibodies-AuNPs complex was investigated to determine the best conditions for chip preparation and serum detection. Finally, the serum of 20 normal people and 20 rheumatoid-arthritis patients were analyzed with the as-prepared sensor chips and the reduction levels of the photocurrents generated by the chips were compared. A significant difference (p = 1.4×10-12) was observed between the averages of the photocurrent reduction levels obtained from the normal-control group and the patient group, enabling the determination of the cut-off value as well as demonstrating the application potential of the PM chips in rheumatoid-arthritis detection.
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