TY - JOUR T1 - The Occurrence of Malolactic Fermentation and Diacetyl Content of Dry Table Wines from Northeastern Portugal JF - American Journal of Enology and Viticulture JO - Am J Enol Vitic. SP - 49 LP - 51 DO - 10.5344/ajev.1984.35.1.49 VL - 35 IS - 1 AU - M. Arlete Mascarenhas Y1 - 1984/01/01 UR - http://www.ajevonline.org/content/35/1/49.abstract N2 - A high incidence of the malolactic fermentation was found in wines from the Vila Real area (northeastern Portugal). The occurrence of this fermentation in white wines was higher than that usually referred to in the literature; however, it was lower than in red wines. The concentrations of diacetyl were significantly higher (P < 0.01) in wines which had undergone malolactic fermentation. In addition to a malolactic fermentation, the diacetyl content depended on the type and composition of the wine and winemaking conditions. In this study the diacetyl contents of red and rosé wines which had undergone malolactic fermentation were significantly different (P < 0.05). For white and red wines in which the fermentation did not occur, the diacetyl contents were not significantly different (P > 0.05). ER -