title: Chemical composition of the epicuticular wax from the fruits of Eucalyptus globulus.
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 esterified forms in the fruit wax. Six compounds were isolated from the fruits by preparative chromatography, and were identified as 8-desmethyleucalyptin, sesamin, tritriacontan-16,18-dione, ursolic acid, 3beta-hydroxyurs-11-en-13beta(28)-olide (ursolic acid lactone) and 3beta,11alpha-dihydroxyurs-12-en-28-oic acid, the latter of which was identified for the first time.
authors.affiliation: CICECO e Departamento de Química, Universidade de Aveiro, Campus Universitário de Santiago, Aveiro, Portugal.
authors.forename: Susana I
authors.initials: SI
authors.lastname: Pereira
authors.forename: Carmen S R
authors.initials: CS
authors.lastname: Freire
authors.forename: Carlos
authors.initials: C
authors.lastname: Pascoal Neto
authors.forename: Armando J D
authors.initials: AJ
authors.lastname: Silvestre
authors.forename: Artur M S
authors.initials: AM
authors.lastname: Silva
mesh_terms: D005052:Eucalyptus / Q000737:chemistry*; D005638:Fruit / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry; D015394:Molecular Structure; D019441:Plant Epidermis / Q000737:chemistry*; D014885:Waxes / Q000032:analysis* / Q000737:chemistry*
chemical_list: D014885:Waxes