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Paeonia lactiflora Pall., one of the most famous classical herbal medicine, has been used to treat diseases for over 1200 years. In this research, the functional ingredients were purified by online‐switch two‐dimensional high‐speed counter‐current chromatography combined with inner‐recycling and continuous injection mode. The antioxidant activity was evaluated by investigating the 2,2′‐azobis (2‐amidinopropane)...
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