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FREEZING CURVE BY BROAD-LINE PULSED NMR AND FREEZE-DRYING.

Author(s) : NAGASHIMA N., SUZUKI E. I.

Summary

THE VAPOR PRESSURE OF UNFROZEN WATER IS GENERALLY LOWER THAN THAT OF ICE AT THE SAME TEMPERATURE, SO THAT SMALLER UNFROZEN-WATER CONTENT IN MATERIALS RESULTS IN IMPROVED FREEZE-DRY THIS PAPER PRESENTS A METHOD FOR A CONTINUOUS MEASUREMENT OF THE UNFROZEN WATER (UFW) CONTENT IN MATERIALS AS A FUNCTION OF TEMPERATURE IN FREEZING AND THAWING PROCESSES USING A BROAD-LINE PULSED NMR. THE FREEZING-THAWING CURVE OF COFFEE SOLUTION SHOWS THAT IT IS EASY TO FREEZE-DRY BECAUSE OF THE LOW UFW CONTENT BELOW 243 K (-30 DEG C). ABOVE 253 K (-20 DEG C), INCREASING OF UFW CONTENT IS OBSERVED, AND THIS POINT CORRESPONDS TO THE COLLAPSE TEMPERATURE.

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Details

  • Original title: FREEZING CURVE BY BROAD-LINE PULSED NMR AND FREEZE-DRYING.
  • Record ID : 1987-0788
  • Languages: English
  • Source: Fundamentals and Applications of Freeze-Drying to Biological Materials, Drugs and Foodstuffs.
  • Publication date: 1985/05/20
  • Document available for consultation in the library of the IIR headquarters only.

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