Phytochemical and antimicrobial study of Oroxylum indicum.

Oroxylum indicum(Linn.) Vent , the plant used in this study is one among the group of ten drugs named Dasamoola, widely used in Ayurvedic system of medicine. The officinal part of this plant, the root bark is often adulterated with the stem of the plant. Hence this comparative study of root and stem of this plant becomes highly significant.The Physico-chemical parameters, Thin Layer Chromatography and High Performance Thin Layer Chromatography studies of stem and root were carried out in this study separately. The TLC studies of three different fractions were isolated - (1) Lipids, fats and waxes (2) Glycosides, Terpenoids and Phenols (3) Alkaloids TLC studies showed that the phytochemicals isolated from root and stem separately are different from each other, thus helping to distinguish the part used.The review of Ayurvedic classical literature also reveals that the therapeutic actions of stem and root are different. The antibacterial activity of alcoholic extracts of stem and root were carried out separately using agar well diffusion method and found that the stem extract has more antibacterial activity especially against organisms causing diarrhea than root extract. This further validates therapeutic indications mentioned in Ayurveda.