关键词: 紫玉兰花, 干燥方法, 黄酮, 多酚, 抗氧化性

Abstract: Magnolia liliflora was pretreated by four drying methods-shade drying，sun drying，hot-air drying and microwave drying which effect the flavonoids，polyphenols content and the antioxidant activity of Magnolia liliflora were investigated. The results showed that four drying methods had the different dehydration speed and drying time. Compared to the other drying methods，microwave drying could effectively reduced moisture. Drying rate was influenced by drying methods which followed the order：Microwave drying > hot-air drying > sun drying > shade drying. Addition，treatments of shade drying，microwave drying（900 W）and hot-air drying（50 ℃）exhibited the higher values of flavonoids，polyphenols content and antioxidant activity. However，treatments of sun drying exhibited the lowest values of antioxidant activity because of the lower vaules of flavonoids and polyphenols content. DPPH? scavenging rate had significantly correlated with flavonoids and polyphenols content the correlation coefficient are R2 = 0.7300 and R2 = 0.6675，respectively. Polyphenols content had significantly related with total reducing power（R2 = 0.8234）.

Key words: Magnolia liliflora, drying method, flavonoids, polyphenols, antioxidant activity