Zedoary is an erect herb, often reaching a height of 50cm with ovoid rootstock. Leaves are oblong, acuminate, 30- 60cm long, narrowed to the base, petiole longer than the leaf blade. Flowers are pale yellow. It is cultivated throughout Nepal within the altitude of 1000m.
Zedoary oil is obtained by steam distillation of the rhizomes of Curcurna zedoaria.
The oil can be used as analgesic, anti-inflammatory, digestive, sedative and stomachic. Zedoary oil is used as gastro-intestinal stimulant in flatulent colic and it prevents the stress ulceration. The oil is used as a condiment, as flavouring for liqueurs and in perfumery.
- Appearance:Viscous fluid
- Colour:Golden Yellow
- Aroma:Warm-Spicy, woody and camphoraceous cineolic odour.
- Specific gravity:0.899 – 0.9313 at 27° C
- Optical rotation:[-] 0.75° to 8° at 27° C
- Refractive index:1.39 to 1.482 at 27° C
- Acid number:1. 162 to 3.74
- Ester number:8.23 to 37.28
- Solubility:Soluble in 80% – 90% alcohol
1,8, cineol, 13-eudesmol, p-cymene and elemol are the major constituents of Zedoary oil. Other components are curculone, curcumadiol, curcumanolide A and B, curcumenol, curcucumenone, curcumol, curcu min, curdione, dehydrocurdione, D-borneol, D-camphene, D-camphor. The root also contains numerous other bitter substances, tannins and flavonoids.