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Sorption Behavior of Mechanically Mixed and Freeze‐Dried NaCl/Casein Mixtures
Author(s) -
BAKHIT R. M.,
SCHMIDT S. J.
Publication year - 1992
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.1992.tb05524.x
Subject(s) - chemistry , saturation (graph theory) , adsorption , sorption , sorption isotherm , casein , chromatography , thermodynamics , organic chemistry , physics , mathematics , combinatorics
Adsorption isotherms of mechanically mixed and freeze‐dried mixtures of NaCl/casein at solute percentages of 1, 5, 10, 15, and 20 (wet basis) were obtained over the a w range 0.23–0.927 at 20°C. Experimental isotherm values were compared to those calculated by a mass balance equation. The mechanically mixed samples sorbed additively as predicted by the mass balance equation below 0.755 a w , whereas the freeze‐dried mixtures sorbed more water than predicted (positive interaction) below 0.755 a w , Both types of mixtures sorbed less water than predicted by the mass balance equation (negative interaction) above the saturation a w of the NaCl, 0.755.