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An efficient method for bioassay‐guided preparative isolation of antioxidants from the n‐butanol extract of Astragalus altaicus Bunge was ingeniously developed by combination of silica gel column chromatography and high‐speed counter‐current chromatography. Under the bioassay‐guidance of antioxidant activities, the antioxidants were gradually separated from the crude sample of Astragalus altaicus...
Introduction – Artemisia rupestris L. is a well‐known traditional Chinese medicinal plant in Xinjiang. Rupestonic acid is the main active ingredient of A. rupestris L., and has been chosen as a ‘marker compound’ for the chemical evaluation or quality control of A. rupestris L. and its products. Although HSCCC separation method was developed before, the separation was performed with two steps using...
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