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Use of analytical solutions of groups (ASOG) contribution method to predict water activity in solutions of sugars, polyols and urea
Author(s) -
CORREA ANTONIO,
COMESAÑA JOSE F.,
SERENO ALBERTO M.
Publication year - 1994
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.1365-2621.1994.tb02074.x
Subject(s) - urea , chemistry , hygrometer , fructose , thermodynamics , organic chemistry , physics , humidity
ASOG (Analytical Solutions of Groups) group contribution method was used to predict water activities in solutions of carbohydrates, polyalcohols and urea. Water activities for the systems water‐fructose, water‐fructose‐urea and water‐glucose‐urea at 25°C were measured with an electric hygrometer. A set of new ASOG groups was considered and their interaction parameters calculated by numerical non‐linear regression of published and measured experimental data. a w Values predicted by the proposed method agree with experimental data within 0.1–0.9%.