Comparative thin layer chromatographic investigations on sources of Shankhpushpi
The aim of the present study was to investigate the different plant sources of Shankhpushpi viz., Evolvulus alsinoides Linn. (EA), Convulvulus pluricaulis Choisy. (CP), Canscora decussata Schult. (CD) and Clitorea ternatea Linn. (CT) for their identification utilizing the technique of thin layer chromatography (TLC). Shankhpushpi is vigorously advertised for its effects on learning and memory in print and electronic media in India. Various phytoconstituents have been reported in these herbs namely, p-coumaryl derivatives, xanthones, anthocyanins and flavonones. We explored the two phytochemical markers, namely scopoletin and mangiferin for their presence or absence in all the species by performing co-TLC of the ethanolic extracts with the markers. These chromatographic studies led us to conclude that scopoletin is present as a major constituent in all whereas mangiferin is present in CD only.