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A simple and convenient HS-SPME-GC-based detection method with high detection limit, good recoveries, highly reproducibility, minimal matrix effects and a 30-min total run time for 4-ethylphenol (4-EP) and 4-ethylguaiacol (4-EG) in red wines has been developed. The 4-EG concentration that was generated during alcoholic fermentation exhibited a biphasic trend, with an initial increase that was followed...
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