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Monitoring freeze-drying by low resolution pulse NMR: determination of sublimation endpoint.

Author(s) : MONTEIRO MARQUES J. P., LE LOCH C., WOLFF E., et al.

Type of article: Article

Summary

An NMR method was developed for detection of the sublimation period endpoint during the freeze-drying of potato pieces. Longitudinal and transverse relaxation times were estimated using rapid NMR methods. Samples were immediately examined to determine presence of a frozen core. The plot of longitudinal vs transverse relaxation time showed an abrupt increase at a point corresponding to the complete elimination of the frozen core. Similar longitudinal vs transverse relaxation time curves were observed when monitoring freeze-drying of a single potato piece inside the NMR probe-head. The detection of an anomalous freeze-drying is possible by monitoring the longitudinal and transverse relaxation time or the free induction decay signal.

Details

  • Original title: Monitoring freeze-drying by low resolution pulse NMR: determination of sublimation endpoint.
  • Record ID : 1993-0557
  • Languages: English
  • Source: Ital. J. Food Sci. - vol. 56 - n. 6
  • Publication date: 1991/11
  • Document available for consultation in the library of the IIR headquarters only.

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