Oak Quercus frainetto Ten. Honeydew Honey—Approach to Screening of Volatile Organic Composition and Antioxidant Capacity DPPH and FRAP AssayReportar como inadecuado




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1

Faculty of Chemistry and Technology, University of Split, N. Tesle 10-V, 21000 Split, Croatia

2

Marko Marulić Polytechnic in Knin, P. Krešimira IV 30, 22300 Knin, Croatia





*

Author to whom correspondence should be addressed.



Abstract 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 terpenesmainly 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.

Keywords: Quercus frainetto Ten. honeydew honey; headspace solid-phase microextraction HS-SPME; ultrasonic solvent extraction USE; gas chromatography and mass spectrometry GC and GC-MS; DPPH and FRAP assay Quercus frainetto Ten. honeydew honey; headspace solid-phase microextraction HS-SPME; ultrasonic solvent extraction USE; gas chromatography and mass spectrometry GC and GC-MS; DPPH and FRAP assay





Autor: Igor Jerković 1,* and Zvonimir Marijanović 2

Fuente: http://mdpi.com/



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