precipitated out 怎样理解？ 查了sodium pentosan polysulfate分子量4000－5000。（pentosan polysulfate (pps, syn sp54, tavron, and elmiron) is a sulphated, semi synthetic polysaccharide obtained from beechwood (fagus sylvatica) bark shavings comprising a mixture of macromolecules. pps is hygroscopic, soluble in water to 50% and has a molecular weight of 4000-5000 dalton. it consists of different sized polymers with the major population composed of 12-16 subunits.） 那么这里透过10000mw膜的是要得到的产品sodium pentosan polysulfate。也就是说通过半透膜透析是去除小分子无机盐，然后通过10000mw膜过滤去除比sodium pentosan polysulfate分子量大的杂质，从而达到筛选的目的。 但是楼主又说最后其实要求选1000mw的膜，不用10000mw的，这一下子就糊涂了，呵呵查看更多
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