Solubility of amino acids in mixed solvent systems
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abstract
The solubilities of L-serine, L-threonine and L-isoleucine in the aqueous
systems of ethanol, 1-propanol and 2-propanol were measured in the
temperature range between 298.15 K and 333.15 K by means of a
gravimetric method and a spectrophotometric technique based on a
ninhydrin reaction. The solubility data from this work and from literature
were used to explore the potentialities of the application of the excess
solubility approach with the NRTL [1], modified NRTL [2], modified
UNIQUAC [3, 4] equations and the model presented by Gude et al. (1996)
[5, 6]. These four models give a global average relative deviation of 12.2 %,
12.0 %, 15.1 %, and 16.2 % for correlation and 16.3 %, 14.6 %, 27.3 %, and
22.0 % for prediction, respectively.
