L-Ascorbic acid in nonenzymatic reactions
- 1 January 1995
- journal article
- research article
- Published by Springer Nature in Zeitschrift für Lebensmittel-Untersuchung und Forschung
- Vol. 200 (1) , 52-58
- https://doi.org/10.1007/bf01192908
Abstract
Es wurde der Einfluß des Wassergehalts, des Molverhältnisses, der Zeit und der Temperatur auf die Bildung nicht dialysierbarer Melanoidine im Modellsysteml-Ascorbinsäure-Glycin erforscht. Die isolierten Melanoidine sind durch UV- und IR-Spektren charakterisiert und durch Gelchromatographie fraktioniert. Berechnet sind die Reaktionsgeschwindigkeitskonstanten für Temperaturen von 90°, 100° und 110°C, welche (0.84±0.29) x 10−5 x s−1, (1.33±0.14) x 10−5 x s−1 und entsprechend (5.30±0.37) x 10−5 x s−1 sind. Die Aktivierungsenergie der Reaktion wurde zu 106.07±32.47 kJ/ mol bestimmt. 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.Keywords
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