Sucrose solution freezing studied by magnetic resonance imaging.
Ice formation of a 20% w/v sucrose solution was monitored during the freezing process by magnetic resonance imaging (MRI). An original experimental setup was designed with oil as a cooling fluid that allows accurate control of the temperature. The NMR signal intensity of particular sampled volumes was observed during the entire cooling period, from 0 to -50 degrees C, showing a peak characteristic to a transition before the loss of the signal. Moreover, spatial ice distribution of the frozen matrix was observed by high resolution MRI with an isotropic resolution of 78x78x78microm(3). MRI has proved to be a novel technique for determining the glass transition temperature of frozen sucrose solutions, in the concentration range where calorimetric measurements are not feasible.
Mahdjoub
Rachid
R
Laboratoire de RMN, UMR5012 CNRS, Université Claude Bernard Lyon 1, ESCPE, 43 bd du 11 Novembre 1918, 69616 Villeurbanne cedex, France.
Chouvenc
Pierre
P
Seurin
Marie José
MJ
Andrieu
Julien
J
Briguet
André
A
D005615:Freezing; D007700:Kinetics; D008279:Magnetic Resonance Imaging / Q000295:instrumentation; D044367:Phase Transition; D012996:Solutions / Q000737:chemistry*; D013395:Sucrose / Q000737:chemistry*
D012996:Solutions; D013395:Sucrose