Poly(allylamine chloride) (PAH) (Sigma-Aldrich, ref 28.322-3, Mw = 70 000 g/mol) was dissolved at 50 mM Tris buffer for which pH has been previously adjusted to 7.5 with hydrochloric acid (Across Chemicals).  


文摘中：Poly(allylamine chloride) (PAH)是什么物质，大致性质如何？
缓冲溶液Tris buffer前面有个50mM，这个mM是什么单位？（原文中就是这么写的）
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