%0 Journal Article
%T Oak (Quercus frainetto Ten.) Honeydew Honey¡ªApproach to Screening of Volatile Organic Composition and Antioxidant Capacity (DPPH and FRAP Assay)
%A Igor Jerkovi£¿
%A Zvonimir Marijanovi£¿
%J Molecules
%D 2010
%I MDPI AG
%R 10.3390/molecules15053744
%X Two samples of oak honeydew honey were investigated. Headspace solid-phase microextraction (HS-SPME) combined with GC and GC/MS enabled identification of the most volatile organic headspace compounds being dominated by terpenes(mainly cis- and trans-linalool oxides). The volatile and less-volatile organic composition of the samples was obtained by ultrasonic assisted extraction (USE) with two solvents (1:2 (v/v) pentane -diethyl ether mixture and dichloromethane) followed by GC and GC/MS analysis. Shikimic pathway derivatives are of particular interest with respect to the botanical origin of honey and the most abundant was phenylacetic acid (up to 16.4%). Antiradical activity (DPPH assay) of the honeydew samples was 4.5 and 5.1 mmol TEAC/kg. Ultrasonic solvent extracts showed several dozen times higher antiradical capacity in comparison to the honeydew. Antioxidant capacity (FRAP assay) of honeydew samples was 4.8 and 16.1 mmol Fe2+/kg, while the solvent mixture extracts showed antioxidant activity of 374.5 and 955.9 Fe2+/kg, respectively, and the dichloromethane extracts 127.3 and 101.5 mmol Fe2+/kg.
%K Quercus frainetto Ten. honeydew honey
%K headspace solid-phase microextraction (HS-SPME)
%K ultrasonic solvent extraction (USE)
%K gas chromatography and mass spectrometry (GC and GC/MS)
%K DPPH and FRAP assay
%U http://www.mdpi.com/1420-3049/15/5/3744