New Activities for Isolated Compounds from Convolvulus austro‐aegyptiacus as Anti‐ulcerogenic, Anti‐ Helicobacter pylori and Their Mimic Synthesis Using Bio‐guided Fractionation

Bio‐guided fractionation of the total alcoholic extract of Convolvulus austro‐aegyptiacus was screened for its anti‐ulcerogenic activity, using an absolute‐ethanol‐induced ulcer model at 500 and 1000 mg/kg doses. Two compounds were isolated from the butanol extract of C. austro‐aegyptiacus and identified by 1 H and 13 C nuclear magnetic resonance as scopoletin and scopolin. The isolated compounds (50 mg/kg) showed a remarkable anti‐ulcerogenic activity because they exhibited control‐ulcer protection by 16.7% and 90.8%, respectively. The acute toxicity study showed that the extract is highly safe; the median lethal dose (LD 50) was more than 4000 mg/kg. Moreover, the obtained results were confirmed by the sub‐chronic toxicity because the rats that have been administered 1000 mg/kg of the extract for 15 consecutive days showed no alteration in the liver and kidney functions. Copyright © 2015 John Wiley & Sons, Ltd.