Oragnoleptic properties

Specification

Appearance

Colorless, hexagonal crystals, usually needle-like, or in fused masses, or crystalline powder.

Odour 

Pleasant peppermint-like odor

Solubility

Very soluble in alcohol, in chloroform, In ether,and in solvent hexane; freely soluble in glacial

acetic acid, in mineral oil, and in fixed and volatile oils; slightly soluble in water.

Physical Characteristic

Identification (a)

The retention time of the major pick of the sample dilution corresponds to that of menthol peak of the standard solution, as obtained in the

assay

Identification (b)

It meets the requirements in specific test forop tical rotation (781S), Procedures, Specific rotation.

Congealing range

30.5－32℃

Melting range

41－44℃

Impurities

Limit of non-volatile residue

Related compound:Isomenthol

Total impurities

NMT 0.05

NMT 0.5

NMT 2.0

Readily oxidizable

substances in dl menthol

The purple color of potassium permanganate is still apparent after 5 min.

Chromatographic Analysis:%

d-Menthol

98.0 to 102