蛋白质的等电点(isoelectric point,pI),蛋白质溶液处于某一pH溶液时,蛋白质解离成正、负离子的趋势相等,即成为兼性离子,净电荷为零,此时溶液的pH称为蛋白质的等电点。
并测定了葡萄籽蛋白质的等电点(PI)为3.8。
通过对双向电泳图谱的初步观察可以看到,蛋白质主要集中在等电点5—8和分子量28kd—66 KD之间。
From 2-d electrophoresis maps, we can find that most of proteins focused between pI5 - pI 8 and molecular weight 28kd-66kd.
蛋白质首先在毛细管等电聚焦过程中根据它们等电点的差异得到分离,然后被电喷雾质谱鉴定。
Proteins were separated and resolved in CIEF according to their differences in isoelectric point (pI), and then characterized by ESI MS.
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