Freeze-thawing behaviour of highly concentrated aqueous alkali chloride-glucose systems.
The freeze-thawing behaviour of highly concentrated aqueous alkali chloride-glucose systems was investigated by differential scanning calorimetry (DSC). In the aqueous NaCl-glucose solution system, single or double glass transitions followed by the corresponding devitrification exotherms were observed during rewarming. In the aqueous KCl-glucose solution system, on the other hand, a single glass transition followed by an exotherm was observed during rewarming. The presence of double glass transitions observed for a certain composition of the aqueous NaCl-glucose solution was taken as an evidence for the liquid-liquid immiscibility at low temperatures. Two kinds of crystallisation accompanied by exotherms during rewarming were identified by X-ray diffraction as ice and ice/NaCl x 2H(2)O, or ice/KCl eutectic component.
Kajiwara
K
K
Department of Biosciences, Faculty of Science and Engineering, Teikyo University of Science and Technology, 2525 Yatsusawa Uenohara-machi, Kitatsuru-gun, Yamanashi, 409-0193, Japan.
Motegi
A
A
Murase
N
N
D002152:Calorimetry, Differential Scanning; D005615:Freezing; D005947:Glucose / Q000737:chemistry*; D006358:Hot Temperature; D011189:Potassium Chloride / Q000737:chemistry*; D017694:Rewarming; D012965:Sodium Chloride / Q000737:chemistry*; D012995:Solubility; D012996:Solutions
D012996:Solutions; D012965:Sodium Chloride; D011189:Potassium Chloride; D005947:Glucose