Vitreous domains in an aqueous ribose solution.
Aqueous solutions containing d-ribose demonstrate the ability to form more than one vitreous domain when exposed to low temperatures. Differential scanning calorimetry revealed two glass transitions (at Tgs of -63 and -43 degrees C) upon cooling and warming at a constant rate of 5 degrees C.min-1. The bulk water of the solution crystallizes at -18 degrees C (Tc). Heat capacity and enthalpy changes, and the derivatives for each thermal event, are calculated. Relaxation studies on the observed Tgs produced anticipated overshoots characteristic of the presence of glassy states.
Wasylyk
J M
JM
Center for Cryobiological Research, State University of New York, Binghamton 13901.
Baust
J G
JG
D002152:Calorimetry, Differential Scanning; D003460:Crystallization; D005615:Freezing; D012266:Ribose; D012996:Solutions; D013696:Temperature; D013816:Thermodynamics; D014867:Water
D012996:Solutions; D014867:Water; D012266:Ribose