New CuCl2-induced glucoside esters and other constituents from Portucala oleracea

Two new glucoside esters 1 and 2 were produced as stress metabolites in the fresh leaves of Portulaca oleracea, in response to abiotic stress elicitation by CuCl2. A new sugar ester (3) and two known compounds (4 and 5) were also isolated. Their structures were established by spectroscopic means. The antioxidative activities of stress metabolites and the related isolates were evaluated by DPPH assay. The results showed that new stress-driven adducts of monolignans and monoterpenes with a glucose bridge exhibited much stronger antioxidative activities than other compounds.

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► Two new glucoside esters from Portulaca oleracea were elicited by CuCl2.
► A new sugar ester and two known compounds were also isolated.
► Phenolics and monoterpenes with a glucose bridge showed higher antioxidative activities than their precursors.