Abstract

Polyphenols are one important type of compounds investigated in the family Boraginaceae, a simple and accurate high performance liquid chromatography with diode-array detector (HPLC-DAD) method was established for simultaneous determination of seven polyphenols including five flavonoid glucosides and two phenolic acids in Ehretia thyrsiflora and several medicinal plants of the family Boraginaceae in China. This is the first report which obtained from the distribution of these polyphenols in these medicinal plants in China or the world and to provide a fast and effective method to evaluate the polyphenols quantification of these medicinal plants. The results showed that rosmarinic acid distributed in all of the tested species of the family Boraginaceae. E. thyrsiflora of the subfamily Ehretioideae contained relatively high amount of total flavonoid glycosides but low amount of phenolic acids compared with all the other species from the subfamily Boraginoideae. 

Key words: Ehretia thyrsiflora, Boraginaceae, LC-DAD, flavonoid glucosides,phenolic acids.