【求助】求助: EP 薄荷脑(Menthol)的扫描页

仅供参考，摘自BP2000 (British Pharmacopoeia 2000)

Menthol (-)-p-Menthan-3-ol (2216-51-5); (±)-p-menthan-3-ol (15356-70-4); C₁₀H₂0O = 156.3
General reagent grade of commerce.

A white, crystalline powder with a penetrating odour of peppermint; melting point, about 44° ((-)-menthol); about 34° (±)-menthol; [α]_D²⁰, about -50° (5% w/v in ethanol) ((-)-menthol).

Menthol used in gas chromatography complies with the following test.

ASSAY Examine by gas chromatography, Appendix III B, under the conditions described in the test for Chromatographic profile in the monograph for Peppermint Oil using the reagent being examined.

The area of the principal peak is not less than 98.0% of the total area of the peaks.