ABSTRACT: To study the effects of different drying methods on the chemical constituents of monoterpenoid glycosides and phenolic acids in Paeonia lactiflora, and to provide a basis for the determination of suitable drying methods for Paeonia lactiflora; to simultaneously determine the contents of four monoterpenoid glycosides and two phenolic acids in samples prepared by different drying methods by HPLC; to make principal component analysis by SPSS software, and to make a comprehensive evaluation by principal component score.
The results showed that the content and water content of Paeonia lactiflora in different drying methods could meet the requirements of Chinese Pharmacopoeia in 2015 edition. Vacuum freeze-drying was used to dry monoterpene glycosides and phenolic acids with the highest content of 6.248%, followed by hot air drying at 60 C with 6.141%. The contents of monoterpene glycosides and phenolic acids in Paeonia lactiflora treated by different drying methods were comprehensively evaluated by principal component analysis. The order is as follows: vacuum freeze drying > hot air 60 drying > Microwave Drying Equipment > far infrared drying > sun drying > hot air 40 > hot air 80 drying > shade drying > hot air 100 drying.
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