4-Ethylphenol and 4-ethylguaiacol contents in bottled wines from the German ‘Württemberg' region
2009
Pour Nikfardjam, Martin | May, Bianca | Tschiersch, Christopher
The 4-ethylphenol (4-EP), 4-ethylguaiacol (4-EG), and 4-ethylcatechol (4-EC) concentrations were determined in 1.312 bottled wine samples from the German ‘Württemberg' region by means of HPLC coupled with fluorescence detection. 4-EC was not detected in quantifiable concentrations in any of the samples analysed. 6.4% of the wines showed 4-EP and 4-EG concentrations over the detection limit of 16 μg/L for 4-EP and 7 μg/L for 4-EG. 1.8% of all wines were over the odour threshold. For white wines it was shown that 4-EG is the only tainting compound and that 0.3% of the wines contain 4-EG above the sensory threshold. The 4-EP and 4-EG contents averaged 17.7 and 4.7 μg/L in red wine and 2.2 and 1.0 μg/L in white wine, respectively. Based on the analytical results a statistical evaluation was performed to assess the impact of various parameters, such as wine type, storage, residual sugar content, etc., which are known to influence ethylphenol concentration. A significant difference between white wine and wine made from red grape varieties was observed. Wine stored for a long time period in wooden casks showed especially high ethylphenol content. Only a slight tendency was observed regarding the residual sugar, alcohol, total acidity and SO₂ content. Based on our data, we cannot confirm the results published by some authors that varieties show significant differences with regard to their ethylphenol ratios.
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