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Natural Menthol Crystal BP2008/USP31
Items | Standards | |
USP31 | BP2008 | |
Identification | Colourless ,transparent hexagonal or needlelike crystals. | |
Melting point(°C) | 41-44°C | About 43°C |
Solubility | 1 g soluble in 5ml of 90%(v/v)alcohol. Forming a clear solution | |
Specific rotation | -45°~-51° | About -50° |
Limit of nonvolatile residue | Not overrun 0.05 under condition of 105°C | |
Organic volatile impurities | Solvent –use dimethyl sulfoxide | |
Chromatographic purity | The peak response due to menthol is Not less than 97% | |
As content | ≤3ppm | |
Loss on dry | ≤0.05% | |
Heavy metals | ≤10 ppm | |
Residue on evaporation | ≤0.05% | |
Related substances | Examine by gas chromatography | |
Residue on ignition | ≤0.1% | |
Usage
[1] natural Menthol crystal is colorless needle-like or prism-like crystals, which is used for medical, food and additives to some perfume, with a special scent of Asian peppermint and hot taste at beginning then cool.
[2] It is highly soluble in alcohol, chloroform, ether, liquid paraffin or volatile oil, and slightly soluble in water.
Flavor Menthol