研究生: |
陳建誠 CHIEN-CHENG CHEN |
---|---|
論文名稱: |
經聚乙二醇雙性高分子修飾之胰凝乳蛋白脢的熱穩定性 Thermostability of α- chymotrypsin modified by Poly(ethylene glycol)-Cotaining Amphiphilic Graft Copolymers |
指導教授: |
陳崇賢
Chorng-Shyan Chern |
口試委員: |
李振綱
Cheng-Kang Lee 邱信程 Hsin-Cheng Chiu |
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: | 2009 |
畢業學年度: | 97 |
語文別: | 中文 |
論文頁數: | 108 |
中文關鍵詞: | 熱穩定性 、胰凝乳蛋白脢 、雙性高分子 |
外文關鍵詞: | α- chymotrypsin, PAAc, PNAS |
相關次數: | 點閱:286 下載:0 |
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本研究以酯交換反應合成一雙性高分子,是以具有酸鹼敏感性聚丙烯酸(PAAc)為主鏈,聚乙二醇(PEG)作為高分子之側鏈,此雙性高分子則可作為酵素(α-chymotrypsin)接枝之載體。
本論文針對胰凝乳蛋白酵素接枝於高分子前後、接枝於高分子含量多寡及在不同溫度下進行催化反應之比較,分別以N-Benzoyl-L-Tyrosine ethyl ether(BTEE)小分子基質、Azocasein大分子基質及BSA大分子基質,與酵素進行催化水解反應。結果發現在小分子基質下,高分子載體中PEG含量增加時,則酵素的剩餘活性相對提高,但酵素的剩餘活性會隨溫度升高而降低;而在Azocasein 大分子基質及BSA大分子基質作用下,酵素會因接枝於高分子中PEG的含量,影響催化作用的分解速率,當PEG含量持續增加反而因立體排斥效應,使酵素不易與大分子基質結合因而影響水解速率;當酵素在低的pH值環境下,進行熱穩定失活反應,酵素不易失活;未經接枝與接枝之酵素,皆會隨著熱穩定時間的增加,使酵素活性隨之下降。經由大、小基質於催化水解反應下之現象差異,了解酵素、載體與基質間各種作用力的消長。
Amphiphilic copolymers comprising poly(acrylic acid) (PAAc) as the backbone and monomethoxy poly(ethylene glycol) (mPEG) as the grafts were synthesized and characterized. The copolymers were used for conjugation with different amounts of α - chymotrypsin immobilized enzyme system.
In this study, it was intended to investigate the activity of enzyme after grafting toward high and low molecular weight substrates. N-Benzoyl-L-Tyrosine ethyl ether was used as a low molecular weight substrate whereas bovine serum albumin and Azocasein was used as a high molecular substrate. Residual activity increased with increasing the mPEG amount when a low molecular weight substrate was used. But enzyme's residual activity was reduced along with temperature increment. The cleavage rate of bovin serum albumin and Azocasein was reduced due to the excess amounts of mPEG that would induce steric effect, there by leading to slow cleavage rate. When the enzyme was under the low pH environment, it was not easy for enzyme to undergo thermal deactivation.
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