title: Characterisation of various grape seed oils by volatile compounds, triacylglycerol composition, total phenols and antioxidant capacity.
abstract: Grape seed oil (Oleum vitis viniferae) representing a promising plant fat, mainly used for culinary and pharmaceutical purposes as well as for various technical applications, was subject of the present investigation. HS-SPME-GC-MS was applied to study volatile compounds in several seed oil samples from different grape oils. The triacylglycerol (TAG) composition of these oils was analyzed by MALDI-TOF-MS/MS. In addition the total phenol content and the antioxidant capacity (using TEAC) of these oils were determined. The headspace of virgin grape oils from white and red grapes was dominated by ethyl octanoate (up to 27.5% related to the total level of volatiles), ethylacetate (up to 25.0%), ethanol (up to 22.7%), acetic acid (up to 17.2%), ethyl hexanoate (up to 17.4%) and 3-methylbutanol (up to 11.0%). Triacylglycerol composition was found to be dominated by LLL (up to 41.8%), LLP (up to 24.3%), LLO (up to 16.3%) and LOO (up to 11.7%), followed by LOP (up to 9.3%) and LOS/OOO (up to 4.3%). Total phenol content ranged between 59μg/g and 115.5μg/g GAE. Antioxidant capacity (TEAC) was analyzed to range between 0.09μg/g and 1.16μg/g.
authors.affiliation: Department of Clinical Pharmacy and Diagnostics, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria.
authors.forename: Stefanie
authors.initials: S
authors.lastname: Bail
authors.affiliation: Institute of Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9/164, 1060 Vienna, Austria.
authors.forename: Gerald
authors.initials: G
authors.lastname: Stuebiger
authors.affiliation: Department of Clinical Pharmacy and Diagnostics, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria. Electronic address: sabine.krist@univie.ac.at.
authors.forename: Sabine
authors.initials: S
authors.lastname: Krist
authors.affiliation: Institute for Foodstuffs, AGES, Spargelfeldstrasse 191, 1226 Vienna, Austria.
authors.forename: Heidrun
authors.initials: H
authors.lastname: Unterweger
authors.affiliation: Department of Clinical Pharmacy and Diagnostics, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria.
authors.forename: Gerhard
authors.initials: G
authors.lastname: Buchbauer
keywords: Antioxidant capacity; Grape seed oil (Oleum vitis viniferae); Total phenols; Triacylglycerols; Volatiles