Polyphenols from Cornulaca monacantha

The aerial parts of the Egyptian herb Cornulaca monacantha have yielded two new galloyltannin analogs (named monacanthin A and monacanthin B) characte rized by protoctechuoyl moiety at C-6, and also a new flavonol glycoside, q uercetin-4'-O-beta -D-galactoside. The structures of the new compounds were established by conventional analytical methods and confirmed by spectral a nalyses. Two known flavonoids, luteolin-7-O-rhamnoside, luteolin-7-O-glucos ide, and two known gallotannins, penta-O-galloyl-beta -D-glucose and 1,2,3, 6-tetra-O-galloyl-beta -D-glucose were also isolated. (C) 2001 Elsevier Sci ence Ltd. All rights reserved.