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Chemical composition of the epicuticular wax from the fruits of Eucalyptus globulus
Author(s) -
Pereira Susana I.,
Freire Carmen S. R.,
Neto Carlos Pascoal,
Silvestre Armando J. D.,
Silva Artur M. S.
Publication year - 2005
Publication title -
phytochemical analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 72
eISSN - 1099-1565
pISSN - 0958-0344
DOI - 10.1002/pca.859
Subject(s) - chemistry , ursolic acid , wax , epicuticular wax , eucalyptus globulus , alkaline hydrolysis , hydrolysis , composition (language) , palmitoleic acid , chromatography , organic chemistry , palmitic acid , fatty acid , botany , eucalyptus , linguistics , philosophy , biology
Abstract The chemical composition of the epicuticular wax from the fruits of Eucalyptus globulus was studied by GC‐MS before and after alkaline hydrolysis. The wax had two main components, ursolic acid and tritriacontan‐16,18‐dione, together with several other triterpenic acids. After alkaline hydrolysis, a large increase in the amounts of triterpenic acids and fatty acids (particularly in hexadecanoic acid) was observed, suggesting that these components were present predominantly in esteried forms in the fruit wax. Six compounds were isolated from the fruits by preparative chromatography, and were identied as 8‐desmethyleucalyptin, sesamin, tritriacontan‐16,18‐dione, ursolic acid, 3 β ‐hydroxyurs‐11‐en‐13 β (28)‐olide (ursolic acid lactone) and 3 β ,11 α ‐dihydroxyurs‐12‐en‐28‐oic acid, the latter of which was identied for the rst time. Copyright © 2005 John Wiley & Sons, Ltd.