Oragnoleptic properties

Specification

Appearance

Colourless to pale yellow  liquid

Odour 

Mentholic

Solubility

Insoluble in water, soluble 1 vol. of solute in 3vol. of solvent (96%)

Physical Characteristic

Identification (1)

Triturate dl－Menthol with an equal quantity of camphor or thymol. The mixture is liquefied.

Identification (2)

To 1 g of dl-Menthol, add 20 ml of sulfuric acid, and shake. Yellowish red turbidity appears. Allow to stand for 24 hours. A transparent, oily layer having no odor of menthol separates.

Refractive index @ 20 ^oC

1.440 to 1.485

Specific gravity @ 25 ^oC

0.862  to 0.925

Optical rotation

+6.5 to -12

Acid value

NMT 2.00mgKOH/gm

Water content

0.30% Max

Melting point

32－34℃

Chromatographic Analysis:%

dl-Menthol

Menthyl acetate

98 Min

2.05 to 8.5