The molecular weight of SA was about 58000 Dalton by SDS-PAGE and its isoelectric point was 5.9-6.2 by IEF-PAGE.

• 在SDS-PAGE中链霉亲和素只有一条带；单体的分子量为14500Da；链霉亲和素的相对分子量约为58000Da; 其等电点为5.；9-6