Wine samples were obtained from one vineyard and one producer in the Zernoseky wine region (North Bohemia, Czech Republic) during the wine-making process. Two white varieties (Muller-Thurgau ["MT"] and Moravian Muscat ["MM"]),and two blue varieties, (Blauer Portugieser ["BP"] and St. Laurent ["ST"]) were assessed. Samples were collected every week from the beginning of November 2005 until the beginning of April 2006 (21 week). In the middle of April the wines were bottled.