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Flavouring agents and cosmetic ingredients: L-Menthol is commonly used as a flavouring agent, added to toothpaste, perfumes, beverages and confectionery to provide a refreshing aroma.
Pharmaceutical Uses.
L-Menthol plays an important role in local infiltration anaesthesia, surgical anaesthesia, and postoperative analgesia.
It is also used in nerve blocks, such as intercostal nerve block, trigeminal nerve block, occipital nerve block, etc. By interacting with the lipids of nerve cell membranes, it prevents the inward flow of sodium ions and inhibits depolarisation, thus producing a local nerve block.
In addition, L-menthol also has the efficacy and effect of dispersing wind and heat, relieving itching and swelling, anti-inflammatory and analgesic, antispasmodic and anaesthesia, and relieving pharyngeal cough, etc., and it can be used to treat cold and fever, headache and dizziness, and relieved by oral tablets or ointment.
Uses of Menthol Crystals.
Menthol and Spearmint can be used as flavouring agents for toothpaste, perfume, drinks and candies. In medicine, it is used as a stimulant, acting on the skin or mucous membranes, with a cooling and itching effect; internally, it can be used as a wind-repellent medicine for headache and inflammation of nose, throat and larynx. Its esters are used in spices and medicines. In the world, China and Brazil are the main natural mint producers, the annual output of peppermint oil have reached 2000-3000t.
The main component of peppermint oil. Due to its characteristic minty flavour and cooling effect, it is widely used in candy, cosmetics and toothpaste.
Preparation of Menthol Crystals.
Product method of Bulk Menthol CrystalsPowder.
L-type is obtained from natural peppermint crude oil by cooling, crystallisation and separation. Peppermint oil containing brain 50% to 60%, cooled to 15 ℃, menthol that is crystal precipitation, centrifugal separation, the oil and then cooled to 5 ℃, and menthol, and then cooled to -10 ℃, and then menthol, three times can be lifted to 50% of the menthol (still about 50% of the residual menthol).
From l-menthol ketone system l-menthol. The residual oil obtained by the above method, under reduced pressure to evaporate terpenes (about 20% to 25%), the remaining with 96% ethanol dissolved, and then reduced to menthol with sodium metal. The synthetic product (dl-) is produced from aromatic aldehyde.
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