Comparative pharmacognostic evaluation of althaea officinalis and alcea rosea root

ABSTRACT

Althaea [Family Malvaceae], a small genus comprising about 15 species distributed in the temperate regions. The official drug Khatmi or Marshmallow, botanically equated to the roots of A. officinalis, the only species of this genus found in India. Alcea rosea L. syn. Althaea rosea [L.] Cav., a substitute of Khatmi is also grown as ornamental plant in Indian gardens. The root, constitute the drug Khatmi and used as demulcent and emollient. The roots are useful in inflammation, irritation of alimentary canal and urinary and respiratory organs The decoction of root is used as an expectorant in whooping cough, hoarseness of voice and bronchitis. It is also reported to be used for fomentation in inflammatory tumors, burns, bruises, sprains etc. as a poultice. Hence, in the present paper, comparative pharmacognostic evaluation of A. officinalis and A. rosea has been undertaken. The root of both the species can be identified on the basis of macro-microscopic characters, physicochemical parameters and TLC finger print profiles. The macroscopic studies showed that the root of A. officinalis are strongly longitudinally furrowed, often spirally twisted with short-medium fracture but in A. rosea these are finely longitudinally furrowed, straight with medium-hard fracture. Microscopically both these species can be differentiated on the basis of size and number of mucilage canals and distribution of fibres. The comparative TLC profiles showed common as well as differentiating bands for example 4 significant bands of orangish-brown colour at Rfs. 0.11, 0.13, 0.37 and 0.41 were only visible in A. officinalis