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A quantitative determination method of formic acid in apple juices is proposed by means of the proton nuclear magnetic resonance ( 1 H NMR) technique. Formic acid gives a singlet signal at the 8.2–8.4ppm interval of the spectrum, and its area is used to determine the concentration of the acid. 1,3,5-Benzenetricarboxylic acid is added to the juice as an internal standard. Since the chemical...
This paper reports a quantitative determination method of (-)-epicatechin in apple juices by measuring of its signal at 7.05 ppm in the 1 H NMR spectrum. It is a direct method that does not need any previous derivatization. 1,3,5-Benzenetricarboxylic acid was added to the juice as internal standard for the determination of the absolute concentration of (-)-epicatechin. Ascorbic acid was also...
This article introduces a method for the determination of chlorogenic acid in apple juices by measuring its signal at 7.20ppm in the 1 H NMR spectrum. The method is direct and does not need any previous derivatization. The addition to the juice of 1,3,5-benzenetricarboxylic acid as internal standard allows the determination of the absolute concentration of chlorogenic acid. Ascorbic acid is...
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