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題 名 | 表面鍵結牛血清蛋白之乳膠粒子的電泳=Electrophoresis of Latex Particles with Immobilized Bovine Serum Albumin |
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作 者 | 徐治平; 蔡淑芬; 楊台鴻; | 書刊名 | 界面科學會誌 |
卷 期 | 24:2-4 民91.09 |
頁 次 | 頁71-87 |
分類號 | 467.14 |
關鍵詞 | 牛血清蛋白; 乳膠粒子; 電泳; 表面電位; Bovine serum albumin; Latex particles; Electrophoresis; Surface potential; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究利用表面具羧基官能基的高分子乳膠顆粒和胎牛血清蛋白(BSA)以預吸附的方式進行化學鍵結,探討在不同pH值及離子強度下,在低鍵結量時鍵結量和表面電位的關係,並提出一數學模型來描述實驗的結果。研究結果顯示,表面吸附BSA之乳膠顆粒的表面電位會隨BSA鍵結量增加而有一先上升後下降的趨勢。由於BSA在本實驗的環境下為帶負電的大分子蛋白質,表面電位值隨鍵結量增加而增大;但當BSA鍵結量增多時,則會在乳膠顆粒表面產生遮蔽效應,負電荷被包在內部,故其表面電位將會減少,反呈現一下降的趨勢。我們提出一個理論模型來描述所觀察到的實驗結果,該模型修飾了文獻中者,考慮BSA鏈結層內之固定電荷密度隨位置改變的情形。 |
英文摘要 | The electrophoretic behavior of PMMA/PMAA copolymer latex, which contains carboxyl groups on its surface, covered by bovine serum albumin (BSA) protein is investigated. Here, BSA is covalently immobilized onto latex surface through a pre-adsorption procedure. The variation of the zeta potential of the particle as a function of the amount of BSA bonding to particle surface, for the case the amount of bonding is not large, is analyzed, and a mathematical model proposed. The experimental data reveal that the absolute zeta potential of BSA covered latex particle exhibits a local maximum at 0.03 mg/m2 of immobilized BSA. The presence of the local maximum can be explained by that while the absolute zeta potential increases with the amount of charges associated with a latex particle, which increases with the amount of BSA immobilized, the resistance to liquid flow due to the presence of a BSA layer also increases with the amount of BSA attached. If the amount of BSA immobilized is small, the former dominates, and the absolute zeta potential increases with the amount of BSA immobilized. On the other hand, if the amount of BSA immobilized is large, the latter becomes more significant. A theoretical model, which takes the position-dependent nature of the fixed charge density of the BSA layer into account, is proposed to describe the experimental data gathered. |
本系統中英文摘要資訊取自各篇刊載內容。