Item

Specifications

Results

USP31

BP2012

Identification

Colorless, transparent hexagonal or needlelike crystals.

Conforms

Melting point

41~44℃

About43℃

41.5~42.5℃

Solubility

1g soluble in 5ml of 90%(v/v)alcohol, forming a clear solution

Conforms

Specific rotation

-45°~-51°

About-50°

-49.68°

Limit of nonvolatile residue

Not overrun 0.05 under condition of 105℃

0.01

Organic volatile impurities

Solvent-Use dimethyl sulfoxide

Meets the requirement

Chromatographic purity

The peak response due to menthol is not less than 98%

≥99.3%

As content

≤3ppm

<3ppm

Heavy metals

≤10ppm

<10ppm

Residue on ignition

≤0.1%

0.03%

Related substances

Examine by gas chromatography

Conforms

Conclusion

The results conforms with BP2012/USP31 standards