The antioxidant activity of Petasites japonicus flower buds cultivated in Tokushima, Japan, was examined in vitro and in vivo. The flower bud extracts were assayed using either oxygen radical absorbance capacity or 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging
Petasites japonicus is an edible and medicinal plant with a good flavor, and it is a rich source of bioactive compounds. S-Petasin has been isolated from Petasites hybridus (L.), Petasites officinalis (L.) and Petasites formosanus, but not from Petasites japonicus. In this study, we found that
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