Objective:Studying on Antioxidant and Antitumor activity of Nano Selenium. Methods: Nano selenium( Nano Se0) was prepared under mild conditions by using platycodon grandiflorum as a template. The super oxideanion free radical scavenging activity of selenium nanoparticle- platycodon grandiflorum was evaluated by pyrogallolaut oxidation assay,determination of hydroxyl radical scavenging activity was evaluated by salicylic acid method,the DPPH radical scavenging was evaluated by spectrophotometry method,the an...