FAMILY: Lamiaceae
SYNONYMS: Mesosphaerum suaveolens, mint weed, bush mint, bush tea, pignut, chan, wild spikenard.
GENERAL DESCRIPTION: An erect, annual herb up to 3 metres high, belonging to the mint family, with a hollow stem, and bearing purple-blue lipped flowers and dark brown, shield-shaped fruits. The oval leaves, which are wrinkled along the edge and pointed, have a strong mint-like aroma when crushed; the taproot is white or brown. It is a very well known pseudo-cereal plant in the Latin America region.
DISTRIBUTION: A native of tropical America, growing in warm and semi-warm regions, commonly found in the rain forests of Ecuador, as well as in the Caribbean and Hawaii; it has also been naturalized in Australia since the mid-nineteenth century. This herb is commonly found alongside roadsides and watercourses and is considered a weed in many tropical areas around the world, especially because the plant can be invasive.
OTHER SPECIES: The mint family is generally known to produce the most variation in essential oil composition and therefore there are many chemotypes of H. suaveolens. Ocotea essential oil from the flowers of the Ocotea quixos tree, which is native to the deep Amazon, is another species found in South America, which yields a little-known essential oil sharing many of phytochemical properties and functions of H. suaveolens.
HERBAL/FOLK TRADITION: Dorado Azul has been used by many indigenous cultures in India, Nigeria and elsewhere for hundreds of years to treat bacterial infections, diarrhoea, tumours, skin diseases, gastro-intestinal disorders and as a natural mosquito repellent and pesticide. The herb has also traditionally been used for the treatment of asthma, hormonal balance (oestrogen), inflammation, muscular aches and pains and for wound healing.
Today the essential oil of Dorado Azul is recognized largely for its role in treating respiratory conditions and in supporting the sinuses and lungs, much like mint and eucalyptus. In addition to its respiratory benefits, Dorado Azul oil is also proving to be a very effective ingredient in essential oil blends that repel insects and pests. Indeed, recent studies have confirmed it is effective as a natural crop and grain insecticide. A study in 1999 revealed that the oil was effective against both gram positive (Bacillus cereus and Staphylococcus aureus) and negative (E. coli, Pseudomonas spp.) bacterial strains; as well as Candida albicans. A further study exhibited broad-spectrum antibacterial and antifungal activity against Aspergillus niger and Micrococcus luteus respectively.
ACTIONS: Analgesic, anti-inflammatory, antifungal, antimicrobial, antioxidant, anticancer, insecticidal, anti-infectious, expectorant, immune stimulant.
EXTRACTION: Essential oil distilled from the stems, leaves and flowers.
CHARACTERISTICS: The essential oil is a reddish liquid with a fresh-herbaceous odour. It blends well with peppermint, eucalyptus, ravintsara, tea tree, myrtle, balsam and spice oils.
PRINCIPAL CONSTITUENTS: Main constituents are sabinene (16.5 per cent), trans-?-bergamotene and ?-caryophyllene (19.8 per cent), terpinen-4-ol (9.6 per cent) and ?-pinene (8.6 per cent). Another study (using a different chemotype) reported sabinene (30 per cent), terpinen-4-ol (11.4 per cent), terpinolene (5.6 per cent), 1,8-cineole (5.2 per cent), ?-pinene (4.4 per cent) and ?-terpinene (4.2 per cent).
SAFETY DATA: No reported contra-indications: however since there are many variable chemotypes of this oil, the safety data will depend on the specific chemical make-up of the individual oil.
AROMATHERAPY/HOME: USE
Skin Care: Infected skin conditions.
Circulation Muscles And Joints: Arthritic and rheumatoid-type pain, circulatory stimulant, muscular aches and pains.
Digestive System: Indigestion, candida and other intestinal tract problems.
Respiratory System: Asthma, bronchitis, colds, coughs, ’flu, sinus congestion, allergic reactions that cause constriction and compromised breathing.
Immune System: Tonic.
Nervous System: Nervous debility.
OTHER USES: ‘Chan’ is commonly used locally as a refreshing, healthy drink, which is made by leaving the seeds to soak in water and refrigerating the mix.
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