Abstract
This work aims firstly to measure the solubility of four natural phenolic compounds (syringic acid, trans-cinnamic acid, p-coumaric acid, and vanillin) present in Deverra DC. Genus in (ethyl alcohol + ethyl acetate) using the gravimetric method from 283.15 to 323.15 K at normal pressure and then to analyze the solubility using the Jouyban-Acree and van't Hoff-Jouyban-Acree models. Secondly, based on the obtained solubility data, the preferential solvation parameters (δx1,3) of four natural phenolic compounds (PhC) in double solvent mixtures of ethyl alcohol (1) + ethyl acetate (2) were calculated using the inverse Kirkwood-Buff integrals method. The δx1,3 numbers differ indirectly with the co-solvent (1) fraction in all the binary mixtures. For the ethyl alcohol (1) + ethyl acetate (2) systems, the δx1,3 values are negative in ethyl acetate-rich mixtures and positive in constituents (x1) ranging from 0.59 to 1 for syringic acid, 0.51 to 0.63 trans-cinnamic acid, and 0.48 to 0.63 for vanillin in the mole fraction of ethyl alcohol. However, for the ethyl alcohol (1) + ethyl acetate (2) +p-coumaric acid (3) mixtures comprising 0 <x1 < 0.63, the values of δx1,3 are positive. This indicates that the co-solvent preferentially dissolved p-coumaric acid. The positive amounts of δx1,3 obtained are because the phenolic molecules that interact with the hydrogen acceptor groups existing in the co-solvent have higher acidic properties.
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