Mentha is widely found in terai region of Nepal, especially far west region. It was adopted and now cultivated for commercial purpose. It is a perennial herb, 60 cm high. Leaves simple, opposite, short stalked, oblong, 2.5- 5 cm long obtusely or acutely serrated. Flowers are small and lilac in auxiliary whorls. Fruits nut lets are smooth. It’s essential oil is extracted via steam distillation process.
Physical and Chemical Properties
Appearance : Slightly thick
Aroma : Strong, fresh and somewhat bitter-sweet.
Flash Point : 71°C
Specific Gravity : 0.8930 to 0.9115 at 25°C
Refractive Index: 1.457 to 1.479 at 25°C
Relative Index :
Ester Value : 100.9 to 255.7
Ester Value after Acetylation : 237.05 to 335.4
Optical Rotation : (-)16 to (-)45 at 25°C
Acid Number : 0.2 to 3.5
Total Alcohol :
Solubility : Soluble in 1.2 to 2.5 vol. of .70% alcohol