Investigation of 1-(2-carboxyethyl)-3-methylimidazolium chloride[HOOCEMIM][Cl] ionic liquid effect on water activity and solubility of l-serine at T=298.15K

Salting-out behaviour of 1-butyl-3-methylimidazolium bromide, [C4mim][Br], ionic liquid on aqueous l-serine solutions at T=298.15K

“…In continuation of our previous studies on the effect of 1-carboxymethyl-3-methylimidazolium chloride [HOOCMMIM][Cl] and 1-carboxyethyl-3-methylimidazolium chloride [HOOCEMIM][Cl] ionic liquids on the solubility of amino acids [11][12][13], in this work the effect of commonly used 1-butyl-3-methylimidazolium bromide, [C 4 mim][Br] ionic liquid on aqueous amino acid solutions was studied in order to obtain further evidence of the salting effect produced by the addition of this kind of ionic liquid. For this purpose, water activity for the ternary system {L-serine + [C 4 mim][Br] + H 2 O} was measured using the improved isopiestic method at T = 298.15 K. Furthermore, to have a better insight about the interactions between IL and amino acid solutions, we also measured the solubility of L-serine in aqueous [C 4 mim][Br] solutions at 298.15 K using the gravimetric method.…”

“…The isopiestic apparatus used for determination of water activity of ternary {L-serine+ [C 4 mim][Br] + water} system is similar to the one used by Ochs et al [21]. This apparatus has been used for determination of water activity in our previous works [11][12][13]. This apparatus consisted of a seven-leg manifold attached to round-bottom flasks.…”

“…In this study, the gravimetric method applied without any modification is that described in our previous works [11][12][13] to measure the solubility of L-serine in water the presence of [C 4 mim] [Br]. The compositions of the initial solutions have standard uncertainty of 0.1 mg.…”

“…Recently, we also extended the modified NRTL [11] model for this purpose. These models were successfully used for correlation of water activity and solubility data for the (amino acid-IL-water) systems in our previous works [11][12][13].…”

“…These equations together with the procedure of using them for correlating water activity in (amino acid + IL + water) systems can be found in detail in our previous works [11][12][13].…”