Absrtact: Magnolia flower was treated by different drying methods, such as sun drying, shade drying, hot air drying and microwave drying equipment, to explore its effects on flavonoids, polyphenols content and antioxidant activity of Magnolia flower.
The results showed that the order of drying speed was microwave drying > hot air drying > sun drying > shade drying. The content and antioxidant activity of flavonoids and polyphenols in the samples dried by shade drying, 900 W microwave drying and 50 C hot air drying were higher, and the degradation loss of polyphenols and flavones was the greatest and the antioxidant activity was the lowest in the sun drying. DPPH clearance rate was significantly correlated with flavonoid content (R2 = 0.7300) and polyphenol content (R2 = 0.6675), and total reducing power was significantly correlated with polyphenol content (R2 = 0.8234).
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