TY - JOUR T1 - The Effect of Tannic Acid on the Secondary Fermentation of Champagne JF - American Journal of Enology and Viticulture JO - Am J Enol Vitic. SP - 246 LP - 253 DO - 10.5344/ajev.1968.19.4.246 VL - 19 IS - 4 AU - Raul T. De Soto AU - Richard Huber Y1 - 1968/01/01 UR - http://www.ajevonline.org/content/19/4/246.abstract N2 - High tannin levels were shown to produce marked inhibition of yeast growth rate during the secondary fermentation of champagne. There appears to be a direct relation between tannin level and the development of yeast under these conditions, Maximum viable cell counts were reduced 3.6, 11.7, 22.5, and 29.7% by tannin additions of 0.5, 1.7, 2.9, and 4.1 g/l to a wine substrate containing 0.03 g/100 ml. The reduction of yeast growth resulted in lower final pressures and higher residual sugars. The reduced final pressures in the champagne containing 0.32 g/100 ml tannin or more would be substantial enough to be considered a serious problem in champagne production. Secondary effects apparently related to the higher tannin level were also observed: exceedingly high false pressures, rapid evolution and loss of carbon dioxide, foaming, and "gushing." Suggested as corrective measures are routine tannin analysis of red wines to be used in sparkling burgundy, judicious bending, and possibly, the use of a larger inoculum to provide a higher concentration of enzymes at the beginning of the secondary fermentation. ER -