Effects of pre-processing on the active compounds before drying Eucommia ulmoides leaves

Aiming to provide a new way that preserves more active components in Eucommia ulmoides (EU) leaves, this paper utilizes 4 methods, i.e., microwave, steam, air heating, and frying, process EU leaves before drying, their respective effects on the were evaluated. The antioxidant activity of vitro was measured by DPPH free radical method; contents total flavonoids (TFC) phenols (TPC) analyzed spectrophotometry; main determined high-performance liquid chromatography (HPLC). results showed pre-process improved quality leaves. As simple fast process, microwave is most effective technique retention four ingredients except aucubin. High power (800 W) short time (2.5 min) are conducive ingredients, with high activity. Appropriate steam frying processes also exhibited benefits for components. In particular, samples treated 10 minutes great potential industrial application highest polyphenol content. Therefore, proper pre-processing drying should be conducted effectively protect