研究生: |
朱玟瑜 Wen-yu Chu |
---|---|
論文名稱: |
磁性酵母菌(Magnetic P. pastoris)純化刀豆粉粗萃液中之刀豆球蛋白A Purification of Concanavalin A from crude extract of Jack Bean by using magnetic P. pastoris |
指導教授: |
李振綱
Cheng-kang Lee |
口試委員: |
陳秀美
Hsiu-mei Chen 張嘉修 Jo-shu Chang |
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: | 2007 |
畢業學年度: | 95 |
語文別: | 中文 |
論文頁數: | 87 |
中文關鍵詞: | 奈米磁性粒子 、磁性酵母菌 、刀豆球蛋白A 、葡萄糖氧化酶 |
外文關鍵詞: | nanoparticle, magnetic yeast, concanavalin A, glucose oxidase |
相關次數: | 點閱:152 下載:6 |
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Concanavalin A(Con A)是一種從Canavalia ensiformis(刀豆,Jack Beans )萃取出來的植物凝集素(Lectin),它是一種四級體的金屬蛋白,需要過度金屬像是鈣或是鎂離子來幫助活性,可與mannose,glucose,dextran等醣類或醣蛋白上的醣類產生親和性吸附作用,所以已廣泛地應用在醣蛋白的純化上,另外它能與T cell表面特定醣分子結合,而且對A型血液(RH+)有特殊的凝集現象,所以在醫學上的研究也很重要。
酵母菌細胞壁上具有可與Con A產生專一性接合的甘露聚醣,因此酵母菌Pichia pastoris可應用於純化回收Con A。為方便酵母菌之回收使用,本研究製備出磁性流體將酵母菌磁化,此磁性流體以穿透顯式電子顯微鏡觀察其平均磁性粒子大小約為10~15nm,磁化強度為22.3 emu˙g-1。而磁化過後的酵母菌磁化強度為11~11.2 emu g-1,且具有45%之存活率。磁性酵母菌在40C、 pH7.0下與Con A粗萃液進行吸附,每克乾重磁性酵母菌對Con A之最大吸附量可達28.71毫克,葡萄糖溶液及pH 1.25的水溶液可將吸附之Con A脫附,葡萄糖脫附效率有七成,而使用低pH值水溶液脫附效率可達90%以上,且磁性酵母菌重複使用佳,重複吸附Con A達五次,仍有七成之吸附效率。
此外利用含Con A之磁性酵母菌亦可吸附為醣蛋白的葡萄糖氧化酶(GOX),在30℃下每克乾重含Con A的磁性酵母菌可吸附169.15U的葡萄糖氧化酶,且重複使用三次,仍不減GOX之活性。
Abstract
Concanavalin A (Con A) is a lectin isolated from Canavalia ensiformis (Jack Bean). It specifically binds to mannose, glucose and glycoproteins containing mannose.
Since the cell wall of yeast contains a layer amount of mannose, yeast has been used to recover Con A from Jack bean powder. In order to facilitate the recovery of yeast used in batch Con A adsorption system, yeast was in this work, the yeast of Pichia pastoris was treated with magnetic fluid to become magnetic yeast. The magnetic property would cause the yeast to be easily collected and redispersed by applying magnetic field. The saturation of magnetization of magnetic P. pastoris was 11~11.2 emu/g. The maximum Con A adsorption capacity of magnetic P. pastoris was 28.71 mg/ g dry weight at 4℃ and pH 7.0. By treating with 1M glucose solution, as much as 70% of adsorbed Con A could be recovered, while lowering the solution pH to 1.25 the recovery percentage could reach 90%.
The magnetic P. pastoris adsorbed with Con A was able to capture the glycoprotein glucose oxidase. At 30℃, 169.15 U of glucose oxidase was adsorbed for each gram of dry con A-magnetic P. pastoris. The GOX adsorbed on magnetic yeast still retained its activity after repeated use for three times.
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