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Am. J. Enol. Vitic. 40:2:81-84 (1989)
Copyright © 1989 by the American Society for Enology and Viticulture.
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The Effect of Malate or Lactate Content on the pH-TA Relationship of Potassium Bitartrate Saturated Alcohol-Water Solutions

C. W. Nagel 1 and I. W. Herrick 1

1 Washington State University, Department of Food Science & Human Nutrition, Pullman, Washington 99164-6330.

To show the effect of organic acid composition on pH and titratable acidity (TA), an algorithm was derived using the dissociation constants of the acids determined in 0%, 10%, and 20% (v/v) ethanol solutions and the solubility product of potassium bitartrate. Using published solubility products for potassium bitartrate solutions and assuming a 0.15% concentration for succinic acid, the effect of variation of the concentration of malic or lactic acid on TA and tartrate and K+ content in ethanol/ water solutions at different pH values could be calculated with the formulas and computer. Tables were constructed showing the predicted malic or lactic acid content in ethanol/water solutions at a particular TA and pH.

Key words: lactate, malate, pH, titratable acidity, tartrate

Submitted on July 22, 1988






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Copyright © 1989 by the American Society for Enology and Viticulture.