Effects of Different Drying Methods on Contents of 4 Active Ingredients in Leaves of Eucommia ulmoides / 中国药房

ABSTRACT

OBJECTIVE:To investigate the effects of different drying methods on contents of active ingredients in leaves of Eu-commia ulmoides,and provide reference for establishing its drying methods after habitat harvesting. METHODS:Different drying methods [natural drying in the shade for 72 h,natural drying in the sunlight for 36 h,drying beside or over a fire(60℃6 h,80℃2 h,100℃1 h,120 ℃ 0.5 h),microwave vacuum freeze drying for 12 h,vacuum freeze drying for 12 h] were used for process-ing. HPLC was conducted to determine the contents of aucubin,geniposidic acid,chlorogenic acid and geniposide in samples and compare with the untreated fresh products. RESULTS:Contents of 4 ingredients in samples after the 2 freeze drying were close to these in fresh samples,which were higher than samples after other drying. CONCLUSIONS:Drying methods show significant ef-fects on the effective ingredients in leaves of E. ulmoides. Compared with natural drying in the shade and natural drying sunlight and drying beside or over a fire,microwave vacuum freeze drying and vacuum freeze drying can make better retention of the active ingredients in fresh leaves of E. ulmoides.