Abstract
Two novel antioxidant compounds, isoquercitrin 6″- O-methyloxalate ( 6) and methyl 4-caffeoyl-3-dihydrocaffeoyl quinate (salicornate, 7), were isolated from Salicornia herbacea L.. Six known compounds were also identified as 3,5-dicaffeoylquinic acid ( 1), quercetin 3- O-β- d-glucopyranoside ( 2), 3-caffeoyl-4-dihydrocaffeoylquinic acid ( 3), methyl 3,5-dicaffeoyl quinate ( 4), 3,4-dicaffeoylquinic acid ( 5), and isorhamnetin 3- O-β- d-glucopyranoside ( 8). Their chemical structures were determined by spectroscopic data from ESI–MS and NMR. The isolated dicaffeoylquinic acid derivatives ( 1, 3, 4, 5, and 7) showed similar activities for scavenging 1,1-diphenyl-2-picrylhydrazyl radicals and inhibiting formation of cholesteryl ester hydroperoxide during copper ion-induced rat blood plasma oxidation. The two flavonol glucosides ( 2 and 6), which have no substitutions in the B ring of their aglycones, also had similar activity. However, compound 8, which has the same structure as 2 except for the presence of a methoxyl group in the C-3′ position of the B ring, showed predominantly lower antioxidant activity than the other isolated compounds.
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