1. Sinapis Alba. - White Mustard. The seed of Brassica alba (Linne) Hooker filius et Thompson (nat ord. Cruciferae).

Habitat

Asia and Southern Europe; cultivated.

Characters

About 2 mm. in diameter, almost globular, with a circular hilum; testa yellowish, finely pitted, hard; embryo oily, with a curved radicle, and two cotyledons, one folded over the other; free from starch; inodorous; taste pungent and acrid.

Composition

The chief constituents are - (1) A bland fixed oil, 20 to 25 per cent. (2) Sinalbin, C30H44N2S2O16, and Myrosin; the latter is an Enzyme, and in contact with water converts Sinalbin, which is a Glucoside, into a fixed pungent body, very acrid, called Acrinyl Sulphocyanide, C7H7Oncs, Glucose, and Sinapine Sulphate, C16H23No5h2so4.

a. Sinapis Nigra. - Black Mustard. The seed of Brassica nigra (Linne) Koch (nat. ord. Cruciferae).

Habitat

Asia and Southern Europe; cultivated.

Characters

About 1 mm. in diameter, almost globular, with a circular hilum; testa blackish-brown or grayish-brown, finely pitted, hard, embryo oily, with a curved radicle, and two cotyledons, one folded over the other; free from starch; inodorous when dry, but when triturated with water, of a pungent, penetrating, irritating odor; taste pungent and acrid.

Composition

The chief constituents are - (1) The same fixed oil as the white seeds, about 35 per cent. (2) Sinigrin (which is Potassium Myronate, C10H18Ko10ns2, a potassium salt of myronic acid, which is a crystalline gluco-side) and Myrosin, an enzyme which on contact with water converts Sinigrin into the official volatile Oil of Mustard, (see below) (C3H5Cns, which is Allyl Sulphocyanide), Glucose, and Potassium Sulphate. The volatile oil is very pungent and highly volatile, and its development on the addition of water explains the pungency of ordinary mustard.

Resembling black mustard seeds. - Colchicum seeds, which are larger, lighter and not quite globular.

Preparation

Charta Sinapis. Mustard Paper

Black Mustard, 100. Percolate the Mustard with a sufficient quantity of Benzin. Remove the powder and dry; add this to the solution; India rubber, 10; Benzin, 100; and Carbon Disulphide, 100; and with a brush apply to one side of a piece of rather stiff, well-sized paper, and dry.

3. Oleum Sinapis Volatile. - Volatile Oil of Mustard. Allyl Sulphocyanide, C3H5Cns. A volatile oil obtained from Black Mustard by maceration with Water and subsequent distillation.

Characters

A colorless or pale yellow, limpid, and strongly refractive liquid, having a very pungent and acrid odor and taste. Sp. gr., 1.018 to 1.029.

Solubility

Freely in Alcohol, Ether or Carbon Disulphide.

Preparation

Linimentum Sinapis Compositum. Compound Liniment Of Mustard

Volatile Oil of Mustard, 30; Fluid Extract of Mezereum, 200; Camphor, 60; Castor Oil, 150; Alcohol, to 1000; by solution.