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猪肺血管紧张素转化酶的提取与纯化 |
作者: 周利琴 廖丹葵* 孙建华 伍善广 兰雄雕 周敬豪 徐存华 |
单位: (广西大学 化学化工学院 南宁 530004) |
关键词: 血管紧张素转化酶 猪肺 阴离子交换 超滤离心 纯化 |
分类号:Q814.1 |
出版年,卷(期):页码:2014 ,45 ( 4 ): 页码:639-642 |
摘要: |
【目的】研究猪肺血管紧张素转化酶(ACE)的提纯方法,为其生产利用提供技术支撑。【方法】以新鲜猪肺组织为试验材料,匀浆离心后经硫酸铵分级沉淀透析,然后采用离子交换—超滤离心联合法对猪肺ACE粗提物进行纯化,测定ACE的分子量、酶活力、纯化倍数及酶活力回收率。【结果】通过离子交换—超滤离心联合法分离纯化猪肺ACE,可得到相对分子量182 kDa、酶比活力1.2476 U/mg的电泳级纯品ACE,其纯化倍数达357.31倍,酶活力回收率达12.28%。ACE催化反应动力学米氏常数(Km)为0.849 mmol/L,最大反应速率(Vmax)为9.775 nmol/min。【结论】采用离子交换—超滤离心联合法纯化猪肺ACE能够极大缩短分离与纯化时间,且获得较高的纯化倍数和酶活力回收率,是猪肺ACE的高效纯化方法。 |
:【Objective】Extraction and purification of angiotensin converting enzyme (ACE) was studied to provide technical support for its production and utilization. 【Method】ACE crude extracts were purified by DEAE-Sepharose FF anion exchange and ultrafiltration after the fresh lung homogenate was centrifuged, precipitated and dialyzed using ammonium sulfate. ACE molecular weight, specific activity, purification fold and activity recovery were determined. 【Result】Lung ACE obtained by SDS-PAGE showed ACE-pure and molecular mass was 182kDa. The ACE was purified to 357.31-fold with specific activity of 1.2476 U/mg and activity recovery of 12.28%. The Michaelis-constant of the ACE was 0.849 mmol/L and Vmax was 9.775 nmol/min. 【Conclusion】The ion exchange-ultrafiltration is an efficient purification method for lung ACE, as it can greatly shorten the separation and purification time, and get a higher purification fold and activity recovery. |
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