Changes in Tannin Contents and Scavenging Activities of Free Radicals of Mopanshi Persimmon Fruits During Astringency Removal in Warm Water Constituents of Dendrobium devonianum and their antioxidant activity Studies on the antioxidant activity of Coptis chinensis Study on the antioxidant activity of extracts from the leaves of Alchornea trewioides Application of multiple techniques in free radical scavenging material screening Application of multiple techniques in free radical scavenging material screening Antioxidant xanthones from Securidaca inappendiculata Extraction of Total Flavonoids from Peony Episperm and ABTS Radical Scavenging Activity