FAMILY: Brassicaceae (Cruciferae)
SYNONYMS: Sinapsis nigra, B. sinapioides, black mustard.
GENERAL DESCRIPTION: An erect annual up to 3 metres high, with spear-shaped upper leaves, smooth flat pods containing about ten dark brown seeds, and bright yellow cabbage-like flowers.
DISTRIBUTION: Common throughout south eastern Europe, southern Siberia, Asia Minor and North Africa; naturalized in North and South America. Cultivated for its seed and oil in England, Holland, Denmark, Germany and Italy.
OTHER SPECIES: The Russian variety is known as brown mustard or ‘sarepta’ (B. juncea); the white mustard (B. alba) does not contain any essential oil. Also closely related is rape (B. napus) and other local species which are used in India and China.
HERBAL/FOLK TRADITION: The seeds are highly esteemed as a condiment and for their medicinal qualities. They have been used in the East and West to aid the digestion, warm the stomach and promote the appetite, and for cold, stiff or feverish conditions such as colds, chills, coughs, chilblains, rheumatism, arthritis, lumbago and general aches and pains.
ACTIONS: Aperitif, antimicrobial, antiseptic, diuretic, emetic, febrifuge, rubefacient (produces blistering of the skin), stimulant.
EXTRACTION: Essential oil by steam (or water) distillation from the black mustard seeds, which have been macerated in warm water.
CHARACTERISTICS: A colourless or pale yellow liquid with a sharp, penetrating, acrid odour.
PRINCIPAL CONSTITUENTS: Allyl isothiocyanate (99 per cent). NB: Black mustard seed or powder does not contain this constituent, which is only formed by contact with water during the production of the essential oil.
SAFETY DATA: Oral toxin, dermal toxin, mucous membrane irritant. It is considered one of the most toxic of all essential oils.
AROMATHERAPY/HOME: USE None. ‘It should not be used in therapy either externally or internally.’.
OTHER USES: Used in certain rubefacient or counter-irritant liniments. Used extensively by the food industry especially in pickles, seasonings and sauces. Little used as a fragrance component except in cat and dog repellents.