title: Vapor pressures above the vitrified sucrose solution at low temperatures.
abstract: BACKGROUND
  Vitrified solutions are encountered in food and biomaterial preservation. Data of the equilibrium water vapor pressure above the vitrified solution are scarce at temperatures below 0 degrees C.
  
  
  OBJECTIVE
  The study measures the water vapor pressures above vitrified sucrose solutions.
  
  
  METHODS
  Sucrose solutions with concentration ranging from 75% to 79% (wt) were vitrified by cooling in liquid nitrogen, and placed in a thermostat bath. Vapor pressure was measured with a high precision pressure gauge using static method. The vitrification of sucrose solution was verified with DSC.
  
  
  RESULTS
  Experimental data were compared with two models. The empirical Zobrist model fits the experimental data well. The free volume model was improved by fitting the interaction parameter to experimental data. The average discrepancy could be reduced from 5.57% to 2.86%.
  
  
  CONCLUSIONS
  The data have significant implications in the driving force of water removal in secondary drying process.
authors.forename: Shaozhi
authors.initials: S
authors.lastname: Zhang
authors.forename: Yu
authors.initials: Y
authors.lastname: Peng
authors.forename: Bo
authors.initials: B
authors.lastname: Wang
authors.forename: Guangming
authors.initials: G
authors.lastname: Chen
mesh_terms: D003080:Cold Temperature; D003451:Cryoprotective Agents / Q000737:chemistry*; D013395:Sucrose / Q000737:chemistry*; D055548:Vapor Pressure; D058989:Vitrification
chemical_list: D003451:Cryoprotective Agents; D013395:Sucrose