PHYSICO-CHEMICAL AND NATURAL PRODUCT INVESTIGATIONS OF ESSENTIAL OIL AND VARIOUSLY EXTRACTED MEDICINALLY USEFUL MATERIALS FROM THE RHIZOMES OF ALPINIA SPECIOSA K. SCHUM.Abstract
Essential oil isolated from the rhizomes of Alpinia speciosa K. Schum. by hydrodistillation has a yield of 0.69 percent by weight. Light yellow oil from Alpinia speciosa has a spicy odor; specific gravity 0.8577; optical rotation +6o30′. Acid and saponification values are also determined and reported. Extractions of medicinally useful materials separately through solvents of decreasing polarities, viz., water, ethanol, diethyl ether, and petroleum ether are carried out from its rhizome. Ethanol extract has a maximum yield. Odors vary in differently extracted materials. Diethyl ether and petroleum ether extracted materials show a sufficient degree of unsaturation. The essential oil is dextrorotatory. All of the solvent extracted materials are dextrorotatory. Specific gravities, refractive indices, acid, saponification and iodine values of these variously extracted materials are also reported. Tests for the presence of specific natural products indicate the presence of carbohydrates, flavonoids, and steroids in most of the extracted materials.
N. K. Agrawal
Department of Applied Sciences & Humanities, Moradabad Institute of Technology, Moradabad, Uttar Pradesh, India.
19 May 2015
26 September 2015
19 October 2015
31 October 2015