Analytical data are presented for eight gum specimens from Pereskia gu
amacho (Cactaceae). They are dextrorotatory acidic arabinogalactans an
d give very clear solutions of moderate viscosity. The gum contains ga
lacturonic acid, glucuronic acid and its 4-O-methyl ether, galactose,
arabinose, xylose and rhamnose. C-13-NMR spectrum of degraded gum A of
P. guamacho shows interesting structural features of the gum studied.