Journal
PHYTOCHEMISTRY
Volume 57, Issue 4, Pages 587-591Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0031-9422(01)00146-7
Keywords
Eucalyptus globulus; myrtaceae; stem bark; ellagic acid rhamnosides; antioxidant activity
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Four ellagic acid rhamnosides were isolated from the stem bark of Eucalyptus globulus. Their structures have been established on the basis of the analysis of their H-1 NMR. C-13 NMR. HMBC, IR and MS spectral data. The HMBC data of these compounds were most useful for their structure determinations, with these bring determined to be 3-O-methylellagic acid 3 ' -O-alpha -rhamnopyranoside, 3-O-methylellagic acid 3 ' -O-alpha -3 -O-acetylrhamnopyranoside, 3-O-methylellagic acid 3 ' -O-alpha -2 -O-acetylrhamnopyranosidc. 3-O-methylellagic acid 3 ' -O-a-4 -O-acetylrhamnopyranoside, respectively. Their antioxidant activities were evaluated by measuring the inhibition of lipid pel oxidation using rat liver microsomes. with IC50 values of 10.0 14.0 mug/ml. (C) 2001 Elsevier Science Ltd. All rights reserved.
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