Tob. Sci., 1970, 14-40, p. 141-144, ISSN.0082-4623
The determination of organic acids in plants and food products
Philip Morris Research Center USA
A simple method for the determination of malic, citric, and oxalic acids in tobacco leaf, fruits, and vegetables is presented. A dry sample is simultaneously extracted and esterified with 10% sulfuric acid in absolute methanol. The methyl esters...