Measurement and Correlation of Phase Equilibria in Aqueous Two-Phase Systems Containing Polyoxyethylene Cetyl Ether and Three Organic Salts at Different Temperatures

Abstract

The polymer polyoxyethylene(20) cetyl ether (C 56 H 114 O 21 , POELE20) and three salts (K 2 C 2 O 4 , K 2 C 4 H 4 O 6 , and K 3 C 6 H 5 O 7 ) were the phase-forming materials to build the aqueous two-phase system (ATPS) at the temperatures 288.15, 298.15, and 308.15 K. The data of the phase diagram including binodal curve data and tie-line data were determined and fitted by classical equations, and they obtained the satisfactory correlation effect. The phase-forming ability of salt composed of the same cation was investigated by three factors, namely, the valence of the anion, the Gibbs free energy of the anion, and the value of effective excluded volume (EEV). It was found that the phase-forming ability of salt strengthened when the values of said three factors went up. The results of the analysis on the data from the present work and that in our previous paper showed that the order of the phase-forming ability of salts was KOH

Simultaneous separation, concentration and determination of trace fluoroquinolone antibiotics in environmental samples using a polymer aqueous two‐phase system coupled with HPLC

“…Optimization of POELE20-salt ATPS Five POELE20-salt ATPSs were selected to separate and enrich the three fluoroquinolone antibiotics according their liquid-liquid equilibria data reported in our previous work. 30,31,37 The extraction efficiencies and enrichment factors of CIP, NRF and PEF in these ATPSs are shown in Figs 2(a) and (b). These ATPSs contain the same polymer, POELE20, but different salts.…”

“…Five POELE20-salt ATPSs were selected to separate and enrich the three fluoroquinolone antibiotics according their liquid-liquid equilibrium data reported in our previous work. 30,31,37 The CIP, NRF and PEF working solutions were put into a separator vessel, and then the salt solution was added. POELE20 was also added at wileyonlinelibrary.com/jctb a predetermined ratio and the antibiotics and salt were mixed uniformly.…”

“…The extraction efficiency and enrichment factor were analyzed at five temperatures (15,20,25,30 enrichment factor. However, the structure of the antibiotics could be destroyed at higher temperatures.…”

Separation and determination of tetracycline hydrochloride in real water samples using binary small molecule alcohol‐salt aqueous two‐phase system coupled with high‐performance liquid chromatography

“…A small deviation was obtained by comparing the real value of extraction efficiency of TC with the predicted value as shown in Figure . R 2 value was .9952, which proved that the experimental model has good regression and the scheme was feasible . The results obtained by ANOVA were shown in Table .…”

“…R 2 value was .9952, which proved that the experimental model has good regression and the scheme was feasible. 32 The results obtained by ANOVA were shown in Table 5. The mean squares (MS) were determined by the sum of squares (SS) and the corresponding degrees of freedom (DF).…”