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Two novel dicarboxylic Acid derivatives and a new dimeric hydrolyzable tannin from walnuts.

Research paper by Hideyuki H Ito, Takahiro T Okuda, Toshiyuki T Fukuda, Tsutomu T Hatano, Takashi T Yoshida

Indexed on: 01 Feb '07Published on: 01 Feb '07Published in: Journal of Agricultural and Food Chemistry



Abstract

In addition to the 16 previously reported polyphenols including 3 new ellagitannins, 2 novel dicarboxylic acid derivatives, glansreginins A (1) and B (2), and a new dimeric hydrolyzable tannin, glansrin D (3), were isolated, together with 15 known compounds from walnuts, the seeds of Juglans regia. The structures of the new compounds were elucidated on the basis of 1D- and 2D-NMR analyses and chemical data. The antioxidant effect of these isolates was also evaluated by SOD-like and DPPH radical scavenging activities.