This European Standard specifies a method for the enzymatic determination of the total content of citric acid, present either in the form of the free acid or its salts, in fruit and vegetable juices and related products.
DS/EN 1137:1995 history
1995DS/EN 1137:1995 Fruit and vegetable juices - Enzymatic determination of citric acid (citrate) content - NADH spectrometric method