Antiinflammatory effects of different extracts and harpagoside isolated from Scrophularia frutescens L.

Abstract Most species belonging to Scrophularia genus had been used as antiinflammatory drugs by the folk medicine. The phenylpropanoids are considered to be the active principles of these drugs with antiinflammatory action by different Authors, especially harpagoside and harpagide. In this report, the antiinflammatory effects of Scrophularia frutescens L. (Scrophulariaceae) was studied and the iridoid glucoside harpagoside has been evidenced and isolated for the first time from this plant. Aqueous extract, methanolic extract and harpagoside, isolated from the methanolic extract, were tested for antiinflammatory activity on the rat paw oedema. The results obtained showed that the aqueous extract has a small but significant antiinflammatory effect on carrageenan-induced oedema test, while methanolic extract has a lower antiinflammatory activity and the activity of the isolated harpagoside is remarkably low. Thus, the conclusion may be that S. frutescens L. is a potential antiiflammatory agent but its activity is not due to harpagoside.