
Partial characterization and immunomodulatory activity of polysaccharides from the stem of Dendrobium officinale (Tiepishihu) in vitro
Keywords: DOP, crude Dendrobium officinale polysaccharide; DOP-1, the first fraction of DOP; DOP-2, the second fraction of DOP; NK, natural killer; NO, nitric oxide; TFA, trifluoroacetic acid; HPLC, high performance liquid chromatography; PBS, phosphate buffered sa