Major Organic Acid and Potassium Contents in Grape Juice Reconstituted from Commercially Concentrated Juice

Studies on Quality of Grape Juice Part XI

Abstract

The major organic acids (tartaric and malic acids) and potassium contents in the grape juices (13° Brix) reconstituted from commercially six frozen concentrated juices were examined. The tartaric acid contents were 0.06-0.01g/100ml; the malic acid. 0.51-0.56g/100ml; the potassium, 18.7-31.6mg/100ml. The concentration of malic acid was higher than that of the tartaric acid in the above mentioned grape juice. These data suggested that the grape juice contained ca. 0.1g/100ml tartaric acid and ca. 30mg/100ml potassium was stable against the tartar precipitaion.