Lycoperdon gemmatumCHAPTER XVIII. Colouring Matters of Unknown Constitution.

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.

According to Kotake and Naito (Zeitsch. physiol. Chem., 1914, 90, 254) the fungus Lycoperdon gemmatum on extraction with alcohol gives a crystalline brown dyestuff. This is a glucoside, and when hydrolysed gives dextrose and gemmatein, C₁₇H₁₂O₇, brown needles. Fusion with alkali gives p-hydroxyphenylacetic acid, and when oxidised with hydrogen peroxide homogentisic anhydride is produced.