Ultrasound-assisted extraction gas chromatography–mass spectrometry analysis of volatile compounds in unifloral thyme honey from Greece |
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Authors: | Eleftherios Alissandrakis Petros A Tarantilis Christos Pappas Paschalis C Harizanis Moschos Polissiou |
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Affiliation: | (1) Laboratory of Sericulture and Apiculture, Agricultural University of Athens, 75 Iera Odos, 118 55 Athens, Greece;(2) Laboratory of Chemistry, Agricultural University of Athens, 75 Iera Odos, 118 55 Athens, Greece |
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Abstract: | The volatile fraction of unifloral Greek thyme honey was investigated by means of ultrasound-assisted extraction followed
by GC–MS analysis. Phenolic compounds were the most abundant, followed by short chain fatty acids. In total, 14 compounds
are proposed as potent botanical markers for thyme honey, 12 of which are phenolics. Among them, 3-hydroxy-4-phenyl-2-butanone
and 3-hydroxy-1-phenyl-2-butanone were the most important, as their concentration averages more than 35 mg/kg of honey. Significant
average proportions were found for 1-phenyl-2,3-butanedione, 3-hydroxy-4-phenyl-3-buten-2-one, 3,4,5-trimethoxybenzaldehyde
and 3,4,5-trimethoxybenzoic acid. Minor phenolics with statistical significance (p < 0.0001) are phenylacetonitrile, vanillin, 4-hydroxyphenylethanol, 4-hydroxyphenylacetonitrile, and 2-hydroxyacetophenone.
Phenylacetaldehyde, a common honey constituent is present at higher concentrations in thyme honey (p < 0.0001). Important non-phenolic components are 2-methylpropionic acid which was found at higher proportions in thyme honey
(p = 0.002) and 4-(4-hydroxy-2,2,6-trimethyl-7-oxabicyclo4.1.0]hept-1-yl)-3-buten-2-one, a norisoprenoid found solely in this
type of honey. |
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Keywords: | Thyme honey Ultrasound-assisted extraction Volatile compounds Phenolic compounds |
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