L-Ascorbic acid in nonenzymatic reactions |
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Authors: | Sonia M Rogacheva Margarita J Kuntcheva Ivan N Panchev Tzvetan D Obretenov |
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Affiliation: | 1. Organic Chemistry Department, Higher Institute of Food and Flavour Industries, 26 Maritsa Blvd, BG-4000, Plovdiv, Bulgaria 2. Physics Department, Higher Institute of Food and Flavour Industries, 26 Maritsa Blvd, BG-4000, Plovdiv, Bulgaria
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Abstract: | The influence of the water content, molar ratio, time and temperature on the formation of nondialysable melanoidins produced by the interaction ofl-ascorbic acid and glycine has been studied. The isolated polymers have been characterized by spectrum analysis and fractionated using gel chromatography. The rate constants of the reaction for temperatures of 90°C, 100°C and 110°C have been calculated and are (0.84±0.29) x 10?5 x s?1, (1.33±0.14) x 10?5 x s?1 and (5.30±0.37) x 10?5 x s?1 respectively. The activation energy of the reaction has been determined to be 106.07±32.47 kJ/mol. |
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