title: Influence of phenols mass fraction in olive (Olea europaea L.) paste on volatile compounds in Buža cultivar virgin olive oil.
abstract: The influence of the phenolic content in olive paste of cv. Buža increased by the addition of an aqueous solution of phenolic extract of freeze-dried olive pulp (cv. Istarska bjelica) on the final products of the lipoxygenase pathway in oil was studied. Increases by 12, 38, and 56% for ripe fruits (maturity index = 4.0) and by 38% for unripe fruits (maturity index = 1.2) were examined. Phenols in the olive paste were determined according to the HPLC method, whereas volatiles in oil were determined according to SPME-GC-MS. A significant negative effect on Z-3-hexenal and E-2-hexen-1-ol (Tukey's test, p < 0.05) was found for ripe fruits (average decreases of 55 and 60%, respectively), but not for the unripe sample. Positive effects in both ripening levels were found for Z-3-hexenyl acetate (average increase of 68% for ripe and a double increase for unripe fruits) and total C5 compounds (average increase of 32% for ripe and an increase of 30% for unripe fruits).
authors.affiliation: Department of Food Technology and Control, School of Medicine, University of Rijeka , Braće Branchetta 20, 51000 Rijeka, Croatia.
authors.forename: Valerija Majetić
authors.initials: VM
authors.lastname: Germek
authors.forename: Olivera
authors.initials: O
authors.lastname: Koprivnjak
authors.forename: Bojan
authors.initials: B
authors.lastname: Butinar
authors.forename: Lorena
authors.initials: L
authors.lastname: Pizzale
authors.forename: Milena
authors.initials: M
authors.lastname: Bučar-Miklavčič
authors.forename: Lanfranco S
authors.initials: LS
authors.lastname: Conte
mesh_terms: D005511:Food Handling; D005638:Fruit / Q000737:chemistry / Q000254:growth & development; D008401:Gas Chromatography-Mass Spectrometry; D031658:Olea / Q000737:chemistry* / Q000254:growth & development; D000069463:Olive Oil; D010636:Phenols / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry*; D010938:Plant Oils / Q000737:chemistry*; D055549:Volatile Organic Compounds / Q000737:chemistry*
chemical_list: D000069463:Olive Oil; D010636:Phenols; D010936:Plant Extracts; D010938:Plant Oils; D055549:Volatile Organic Compounds