CHEMICAL-CONSTITUENTS FROM THE ROOTS OF ZIZYPHUS-JUJUBA MILL VAR SPINOSA .1.

The chemical constituents of the roots of Zizyphus jujuba Mill. var. spinosa were investigated with a combination of Sephadex LH-20 column, centrifugal partition chromatography and RP-18 low pressure liquid chromatography. We isolated seven flavonoids-quercetin (1), (+)-dihydroquercetin (2), (+)-dihydrokaempferol (7), quercetin-3-O-beta-glucoside (8), 2-hydroxynaringenin (11), rutin (12), and quercetin 3-O(2(G)-beta-D-xylopyranosylrutinoside) (13); four catechins-(-)-gallocatechin (3), (-)-epigallocatechin (4), (-)catechin (5), and (-)-epicatechin (6); and two phenolic carboxylic acids-p-hydroxybenzoic acid (9) and protocatechuic acid (10) from the water soluble fraction of the ethanolic extract. NMR data of 13 were assigned by 2D NMR techniques.