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Simplified method for the prediction of water activity in binary aqueous solutions
Author(s) -
FAVETTO G. J.,
CHIRIFE J.
Publication year - 1985
Publication title -
international journal of food science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.831
H-Index - 96
eISSN - 1365-2621
pISSN - 0950-5423
DOI - 10.1111/j.1365-2621.1985.tb01822.x
Subject(s) - molality , electrolyte , activity coefficient , water activity , aqueous solution , thermodynamics , binary number , work (physics) , chemistry , function (biology) , constant (computer programming) , water content , range (aeronautics) , materials science , mathematics , computer science , physics , geology , geotechnical engineering , arithmetic , electrode , evolutionary biology , biology , programming language , composite material
Summary This work describes the application of a simplified method to predict the water activity ( a w ) of binary aqueous solutions in a range of concentrations relevant to intermediate moisture foods. The water activity as a function of molality for several solutes (electrolytes and non‐electrolytes) is described by the equation, a w , = 1 − K m , where K is a constant and m is the molality. Values of K are reported for fifteen non‐electrolytes and eight electrolytes. The accuracy of water activity prediction by this method satisfies the actual needs in food research.