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Natural Menthol Crystal

Menthol is the solid constituent of oil of mint, and was formerly known as peppermint camphor. It is a
white crystalline compound with a characteristic pungent odor.They dissolve readily into alcohol or
essential oils, and they can also be dissolved into water or oil. Menthol imparts a tingling sensation to
the skin and used in skin fresheners like after-shave and suntan lotions. It has a local anesthetic property
for short-term relief of minor sore throat and minor muscle aches.

Check item | Specifications | Check conclusion |
Appearance | Colourless ,transparent hexagonal or needlelike crystals. | Complies with standard |
Melting point(℃) | 41-44℃ | 42.5℃ |
Solubility | 1g soluble in 5ml of 90%(v/v)alcohol. Forming a clear solution | Complies with standard |
Specific rotation | -45°~-51° | -49.7° |
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 97% | 99.6% |
| As content | ≤3ppm | Absent |
| Loss on dry | ≤0.05% | 0.05% |
| Heavy metals | ≤10 ppm | <10ppm |
| Residue on evaporation | ≤0.05% | 0.03% |
Related substances | Examine by gas chromatography | Meets the requirement |
| Residue on ignition | ≤0.1% | 0.03% |
1. Menthol Crystal often used as additives, with distinct fragrance smell, menthol can promote digestion
and increase appetite.
2. Menthol Crystal applied in daily necessities field, menthol can be added into a large amount of oral
cleaning products, such as dentifrices, mouthwash and tooth powder.
3. Menthol Crystal used in pharmaceutical field, because menthol has the function of inhibition and
paralysis to sensory nerve endings, it can be used as counter irritant.

1. Natural menthol
Mentha arvensis is the primary species of mint used to make natural menthol crystals and natural menthol flakes.
2. Chemical properties
Menthol reacts in many ways like a normal secondary alcohol. It is oxidised to menthone by oxidising agents such as chromic acid, though under some conditions the oxidation can go further and break open the ring. Menthol is easily dehydrated to give mainly 3-menthene, by the action of 2% sulfuric acid. PCl5 gives menthyl chloride.
3. Biological properties
Menthol's ability to chemically trigger cold-sensitive receptors in the skin is responsible for the well known cooling sensation that it provokes when inhaled, eaten, or applied to the skin.
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