REPRINTS, COPIES
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Sood, V.C. and D.R. Heldman. 1974. Analysis of a vapor pressure manometer for measurement of water activity in nonfat dry milk. J. Food Sci. 39: 1011.
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| Purpose: This study reported investigations of larger particle agglomerates of nonfat dry milk samples on various parameters. |
Experimental and Results: This investiages the relationship between water vaor pressure and water activity. Water vapor pressure at 30C of pure water is 31.824 mm of mercury and water activity is 1. A number of items they determined was as follows:
The influences of sample size and sample container volume on water activity measurement were insignificant.
Product particle size did not have a singificant influence on the water activity value obtained by the method they proposed.
Equilibration time was found to be a function of particle size with times ranging from 10 min for 1000 micron particles to 27 min for 44 micron particles. |
Updated: Thursday, September 6, 2007.
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