Galanga Root(CHAPTER VII. Flavonol Group.)(Osa artikkelista)

The Natural Organic Colouring Matters
By
Arthur George Perkin, F.R.S., F.R.S.E., F.I.C., professor of colour chemistry and dyeing in the University of Leeds
and
Arthur Ernest Everest, D.Sc., Ph.D., F.I.C., of the Wilton Research Laboratories; Late head of the Department of Coal-tar Colour Chemistry; Technical College, Huddersfield
Longmans, Green and Co.
39 Paternoster Row, London
Fourth Avenue & 30th Street, New York
Bombay, Calcutta, and Madras
1918

Kaikki kuvat (kemialliset kaavat) puuttuvat // None of the illustrations (of chemical formulas) included.

Galanga root is the rhizome of Alpinia officinarum (Hance) and is a native of China. It is employed in the form of a decoction as a remedy for dyspepsia.

Galanga root was first examined by Brandes (Arch. Pharm., (2), 19, 52), who isolated from it a substance which he named kaempferide, but this, according to Jahns (Ber., 1881, 14, 2385), was a mixture of three substances, kaempferide, alpinin, and galangin. The subject was later examined by Gordin (Dissert., Berne, 1897), and by Ciamician and Silber (Ber., 1899, 32, 861) and Testoni (Gazzetta, 1900, 30, ii., 327), and it is now clearly demonstrated that galanga root contains kaempferide, galangin, and galangin monomethylether. According to Testoni, the alpinin of Jahns is a mixture of galangin and kaempferide.

Kaempferide, C₁₆H₁₂O₆, consists of yellow needles, melting-point 227-229°, soluble in alkaline solutions with a yellow colour. Sulphuric acid gives a blue fluorescent yellow solution.

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Galangin, C₁₅H₁₀O₅, the second constituent of galanga root, crystallises in yellowish-white needles, melting-point 214-215°, soluble in alkaline solutions with a yellow colour. With acetic anhydride, it gives a triacetyl derivative, C₁₅H₇O₅(C₂H₃O)₃, melting-point 140-142° (Jahns), and by means of methyl iodide a dimethylether, C₁₅H₈O₃(OCH₃)₂, melting-point 142°.

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[---] Galangin dyes with mordanted woollen cloth the following shades:
Chromium. Olive-yellow.
Aluminium. Yellow.
Tin. Lemon-yellow.
Iron. Deep olive.

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