Abstract
The technique of heat flow calorimetry was used to study the thermal behaviour of different carbohydrates between 20°C and 270°C. The samples were analyzed by heating in sealed cells. The temperature range in which exothermic reactions, due to thermal decomposition, occurred varied widely depending on the type of carbohydrate investigated. Reaction enthalpies of 44 sugars and polysaccharides are given. Endothermic phenomena, such as fusion or vaporization of crystallized water, were also observed: fusion temperatures and enthalpies of 34 sugars and sugar alcohols are listed. Calorimetric curves showing crystallization of amorphous sucrose, cellobiose and lactose are also presented.
Zusammenfassung
Die Technik der Wärmeleitungs-Kalorimetrie wurde zur Untersuchung des thermischen Verhaltens von verschiedenen Kohlenhydraten zwischen 20°C und 270°C eingesetzt. Die Muster wurden in dicht verschlossenen Kapseln erhitzt. Der Temperaturbereich, in welchem exotherme Reaktionen infolge thermischer Zersetzung abliefen, änderte sich stark in Abhängigkeit vom untersuchten Kohlenhydrattyp. Reaktionsenthalpien von 44 Zuckern und Polysacchariden wurden ermittelt. Endotherme Phänomene, wie das Schmelzen oder das Verdampfen von Kristallwasser wurden auch beobachtet. Schmelztemperaturen und Schmelzenthalpien von 34 Zuckern und Zuckeralkoholen sind tabelliert. Kalorimetrische Daten der Kristallisation amorpher Saccharose, Cellobiose und Lactose werden diskutiert.
Резюме
Метод калориметрии т еплового потока был использован для изуч ения термического поведения различных углеводов между 20 и 270°C. О бразцы анализировались наг ревом в закрытых ячейках. Вс ледствии термическо го разложения, интервал температур эксотерм ических реакций изменялся в ш ироких пределах в зав исимости от типа исследуемого углевода. Приведены э нтальпии реакций для 44 сахаров и полисахаридов. Наблю дались такие эндотермическ ие явления, как плавле ние или испарение кристалли зационной воды. Приведены температу ры плавления и энталь пии для 34 сахаров и многоатомн ых спиртов. Представлены калори метрические кривые, п оказывающие кристаллизацию амор фной сахарозы, целлобиозы и лактозы.
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The authors greatly acknowledge many discussions with P. Würsch, R. F. Hurrell and J. Löliger and the technical assistance of F. Michel, Ph. Roulet and S. Reimann.
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Raemy, A., Schweizer, T.F. Thermal behaviour of carbohydrates studied by heat flow calorimetry. Journal of Thermal Analysis 28, 95–108 (1983). https://doi.org/10.1007/BF02105282
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DOI: https://doi.org/10.1007/BF02105282