臺灣博碩士論文加值系統

本研究以探討氨基酸通過陽離子交換薄膜（cation-exchange membranes）的機理為目的，使用Nafion陽離子交換薄膜為材料進行實驗，因它可以選擇性地只通透陽離子，同時阻礙陰離子的通過。由於氨基酸本身的性質，可以調整溶液的pH值來改變氨基酸所帶電荷，當溶液之pH值低於氨基酸之等電點時，氨基酸則由中性慢慢轉為帶正電荷而通過陽離子交換薄膜。本實驗是利用一系列的實驗設計探討溶液pH值對氨基酸的通透藉以了解其輸送機制。由實驗結果可初步證明氨基酸通過陽離子交換薄膜機制之理論模型可以利用Nernst-Planck flux equation來解釋帶有正電荷氨基酸在整體系統中的輸送。另外發生質子化反應及去質子化反應和Michaelis-Menten equation 、化學滲透學說（The Chemiosmotic Theory）及膜相飽和理論（Membrane Saturation Theory ）可以解釋在膜界面及膜內之氨基酸輸送行為。一方面實驗結果也指示出氨基酸通過陽離子交換薄膜之輸送速率強烈依賴於外界溶液pH值。這是因為外界溶液pH值直接影響氨基酸進入及離開膜相之速率；而輸送速率決定步驟（Transport rate-limiting step）發生於氨基酸離開膜的一側。這樣的結果對於以大量帶正電荷之氨基酸形式存在之溶液中以及在膜內高度飽和（saturation）時，卻無法提高氨基酸之輸送速率做一個較合理的解釋

In this study, the mechanisms in the permeation of amino acids through a cation-exchanged membrane (Nafion 117) were discussed. The transportation behavior is much dependent on the pH value of the solution and the flux is relatively large below the isoelectric point of the amino acid used. Therefore, a series experiments were set up to elucidate the effects of pH values for amino acid aqueous solutions on the interfacial transportation behavior of Alanine through a H+-membrane. On the other hand, the experimental results could be explained qualitatively by using a theoretical model which incorporates the equilibrium dissociation equations for the various fractions of amino acid form at different pH values. Then the rate equation based on the interfacial chemical reaction was applied to discussed the membrane interfacial transport, and the Nernst-Planck flux equation could explained the ion transport through the bulk of the membrane, respectively. The results indicate that the rate-limiting step in the transport process of amino acid was determined where alanine left from the membrane side. This fact may provide a better understanding for the permeation of amino acid through charged membranes. Finally, the Chemiosmotic theory, Michaelis-Menten equation and membrane saturation theory were used as well to elucidate the transportation behavior in higher concentration of charged amino acid through a H+ membrane in detail.

摘要I
第1章簡介1
第2章理論背景4
2.1. 固定電荷不均勻薄膜4
2.2. Donnan 平衡5
2.3. 溶解及擴散理論：10
2.4. Henderson假設：11
2.5. 局部電中性假設：12
2.6. 化學滲透學說（The Chemiosmotic Theory）及協同式輸送（Co-transport）：13
2.7. 擴散透析：13
2.8. 膜電位：18
2.9. 氨基酸的性質：22
2.10. Michaelis-Menten 方程式：22
第3章實驗：25
3.1實驗材料：25
3.2.實驗儀器：26
3.3實驗裝置：27
3.4實驗步驟：29
第4章實驗數據之計算：32
第5章結果討論：42
5.1 在低Ala濃度及低pH值下：42
5.2高濃度Ala及略高的pH值：49
參考文獻60

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