FAMILY: Lamiaceae (Labiatae)
SYNONYMS: Field mint, Japanese mint.
GENERAL DESCRIPTION: A rather fragile herb with leafy stems up to 60 cms high, lance-shaped leaves and lilac-coloured flowers borne in clustered whorls in the axils of the upper leaves.
DISTRIBUTION: Native to Europe and parts of Asia (Japan and China); naturalized in North America. Major producers of the oil include China, Brazil, Argentina, India and Vietnam.
OTHER SPECIES: There are many varieties and chemotypes of this herb, which is used for large-scale oil production, such as the Chinese type M. arvensis var. glabrata, and the Japanese species M. arvensis var. piperascens.
HERBAL/FOLK TRADITION: It is used therapeutically in many of the same ways as peppermint; the bruised leaves are applied to the forehead to relieve nervous headache. In the East it is used to treat rheumatic pain, neuralgia, toothache, laryngitis, indigestion, colds and bronchitis. In Chinese medicine, it is also employed for relieving earache, treating tumours and some skin conditions.
ACTIONS: Anaesthetic, antimicrobial, antiseptic, antispasmodic, carminative, cytotoxic, digestive, expectorant, stimulant, stomachic.
EXTRACTION: Essential oil by steam distillation from the flowering herb. The oil is usually dementholized since it contains so much menthol that it is otherwise solid at room temperature.
CHARACTERISTICS: Dementholized oil – a colourless or pale yellow liquid with a strong, fresh, bitter-sweet minty odour, somewhat like peppermint.
PRINCIPAL CONSTITUENTS: Menthol (70–95 per cent), menthane (10–20 per cent), pinene, menthyl acetate, isomenthone, thujone, phellandrene, piperitone and menthofuran, among others. Constituents vary according to source.
SAFETY DATA: Non-toxic, non-irritant (except in concentration); may cause sensitization in some individuals. Menthol is a dermal irritant.
AROMATHERAPY/HOME: USE None. Use peppermint in preference, since it is not fractionated like the commercial cornmint oil and has a more refined fragrance.
OTHER USES: Used in some pharmaceutical preparations, such as cough lozenges, herb teas and syrups, mainly in the form of menthol. Extensively employed in soaps, toothpastes, detergents, cosmetics, perfumes and especially industrial fragrances. Used by the food industry especially for flavouring confectionery, liqueurs and chewing gum. However, it is mainly used for the isolation of natural menthol.