PT - JOURNAL ARTICLE AU - J. Gomez Benitez AU - M. M. Grandal Delgado AU - J. Diez Martin TI - Study of the Acidification of Sherry Musts With Gypsum and Tartaric Acid AID - 10.5344/ajev.1993.44.4.400 DP - 1993 Jan 01 TA - American Journal of Enology and Viticulture PG - 400--404 VI - 44 IP - 4 4099 - http://www.ajevonline.org/content/44/4/400.short 4100 - http://www.ajevonline.org/content/44/4/400.full SO - Am J Enol Vitic.1993 Jan 01; 44 AB - Must acidification is a necessary operation in hot regions due to the low natural acid content of the grapes grown there. Tartaric acid is what is most usually used for this purpose. Using gypsum (CaSO4 ยท 2H2O) allows the amount of tartaric acid needed to reach a given pH to be reduced. This paper is a study of the acidification of musts produced in Sherry area (Southern Spain) to a pH of 3.25 with tartaric acid alone and tartaric acid acting together with 2 g/L of gypsum. Using gypsum causes a reduction in must pH of approximately 0.2 units and allows the tartaric acid dosage to be cut down by 1.5 to 2.5 g/L. The concentration of sulfates in the fermented wine lies below 2.5 g/L (the maximum authorized by the European Community), and the calcium concentration is 130 mg/L. Both levels are compatible with a correct winemaking. The acid buffering power of the wine and the alkalinity of the ash are reduced by the use of gypsum, which makes later acidification easier. Other wine component levels are not affected.