MAGNETIC RESONANCE IMAGING STUDIES of the FREEZE-DRYING KINETICS of POTATO |
| |
| Authors: | DN RUTLEDGE F RENE BP HILLS L FOUCAT |
| |
| Affiliation: | Laboratoire de Chimie Analytique Institut National Agronomique 16, rue Claude Bernard 75231 Paris cedex 05, France;I.N.R.A., Laboratoire de Génie des Procédés Biotechnologiques Agro-alimentaires 78850 Thiverval-Grignon, France;A.F.R.C. Institute of Food Research Norwich Research Park, Colney Lane Norwich NR4 7UA, U.K.;I.N.R.A., Station de Recherche sur la Viande Theix 63122 St-Genes-Champanelle, France |
| |
| Abstract: | Subzero temperature NMR Imaging of the nonfreezing water in potato cylinders is used to study freeze-drying kinetics. the analysis of the distribution of transverse relaxation rates of the samples between +5C and -25C is used to determine the state of water in potato tissue and establish imaging protocols. the evolution of the Residual Water Content, the diameter of the frozen core observed visually and of the nonfreezing water detected by NMR Imaging, are monitored as a function of the freeze-drying time. These results are interpreted with a theoretical model based on pure sublimation from the surface of a finite cylinder. |
| |
| Keywords: | |
|
|
