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Bromate-Bromide Mixture. To make a 0.1 A7 bromate-bromide solution, 2.780 grams of c.p. potassium brómate and 10.00 grams of c.p. potassium bromide is dissolved in about 500 ml. of distilled water and diluted to 1 liter in a volumetric flask.

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Z''1 ROWING interest in the role of pectic substances in controlling texture of fruits and vegetables during processing and storage has focused attention on simpler methods for their determination.Usually complete characterization of the pectic substances before and after a particular change is necessary. Occasionally, the problem may be resolved by determining the total quantity of pectic substances in solution.Methods that have been used include weight of alcohol precipitate (1), titration of acid carboxyls plus saponification of methyl esters (5), weight of calcium pectate (0), decarboxylation by heating in concentrated mineral acids (8), and optical rotation (7). Some of these methods require considerable purification of the