Influence of Some Factors on DPPH~· Scavenging Rate of Extraction of Gladiolus gandavensis Petals

The influence of extracting temperature, solvent and time on activity of antioxidant substances in Gladiolus gandavensis petals were analyzed by using method of DPPH· free radical analysis. The results showed that the petal extraction had higher DPPH· scavenging rate when extracted with water or polar organic solvents for 60min at 70℃. Extraction of dark red petals and the petals growing at wilting stage had higher DPPH· scavenging rate.