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Menthol is an organic compound made synthetically or obtained from corn mint, peppermint, or other mint oils. It is a waxy, crystalline substance, clear or white in color, which is solid at room temperature and melts slightly above.
The main form of menthol occurring in nature is (−)-menthol, which is assigned the (1R,2S,5R) configuration. Menthol has local anesthetic and counterirritant qualities, and it is widely used to relieve minor throat irritation. Menthol also acts as a weak kappa opioid receptor agonist.
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Standards |
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USP35 |
BP2012 |
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Identification |
Prismatic or acicular,clolurless,shiny crystals,practically insoluble in water, very soluble in alcohol and in light petroleum,freely soluble in fatty oils and in liquid paraffin,very slightly soluble in glycerol. |
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Melting point(℃) |
41℃---44℃ |
About 43℃ |
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Solubility |
Dissolve 2.50g in 10ml of alcohol R and dilute to 25.0ml with the same solvent. |
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Specific rotation (25℃) |
-45°～-51° |
About -50° |
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Limit of Nonvolatile residue (%) |
Not overrun 0.05 under condition of 105℃ |
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Organic volatile impurities |
Solvent-Use dimethyl sulfoxide |
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Chromatographic purity |
The peak response due to menthol is not less than 97% |
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As content |
≤3ppm |
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Heavy metals |
≤10ppm |
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Residue on ignition |
≤0.1% |
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Related substances |
Examine by gas chromatography |
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