Kinetic studies on the thermal decomposition of glucose and fructose |
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Authors: | F. örsi |
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Affiliation: | (1) Department of Food Chemistry, Technical University, Budapest, Hungary |
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Abstract: | The thermal decompositions of glucose and fructose were studied by means of the Derivatograph. From the melting temperature up to 300 these monosaccharides decompose and give brown caramel matter. The TG curves as functions of time were taken at various heating rates (0.5–10 /min) by the Derivatograph and the activation energies of the decompositions were determined by Ozawa's method.
Zusammenfassung Die thermische Zersetzung von Glukose und Fruktose wurde mit Hilfe des Derivatographen studiert. Diese Monosaccharide erleiden von der Schmelztemperatur bis zu 300 C eine Zersetzung und ergeben braune Karamelstoffe. Die verschiedenen Zeitspannen zugeordneten TG-Kurven wurden vom Derivatographen bei verschiedenen Aufheizgeschwindigkeiten (von 0.5 C/min bis zu 10 C/min) registriert und die Aktivierungsenergie der Zersetzung wurde mittels der Methode von Ozawa bestimmt.
Résumé On a étudié la décomposition thermique du glucose et du fructose à l'aide du Derivatograph . Ces monosaccharides subissent une décomposition à partir de la température de fusion jusqu' à 300 C en donnant des caramels bruns. Les courbes TG ont été enregistrées en fonction du temps avec diverses vitesses de chauffage (de 0.5 C/min jusqu'à 10 C/min) et l'énergie d'activation de la décomposition a été déterminée par la méthode d'Ozawa.
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