A purified extract isolated from Pseudolysimachion rotundum var. subintegrum that contains an abundant amount of active ingredient, its preparation, and the composition that comprises it as an active ingredient to prevent or treat inflammation, allergy and asthma
The present invention is related to a purified extract with the secondary fractionation from the extract ofvarwhich contains 30 - 60 % (w/w) verproside, 0.5 - 10 % (w/w) veratric acid, 2 - 20 % (w/w) catalposide, 1 - 10 % (w/w) picroside II, 1 - 10 % (w/w) isovanilloyl catalpol and 2 - 20 % (w/w) 6--veratroyl catalpol based on the weight of total extract (100 %) ofvar
