Abstract
In this study, the partitioning process of cephalexin antibiotic in aqueous two-phase systems (ATPS's) containing poly(ethylene glycol) (PEG) with molar masses of (1500 and 6000) g·mol–1 and sodium citrate salt has been measured. The experimental partition coefficients were measured at three temperatures: (298, 303, and 308) K. The effects of temperature, polymer mass fraction, polymer molar mass, and salt mass fraction on the experimental partition coefficient of cephalexin were also studied. The results showed that the polymer molar mass has a large effect on the partition coefficient and the temperature influence is almost negligible. The experimental data of the partition coefficients of cephalexin in polymer–salt ATPS's were correlated using the equation proposed by Diamond–Hsu.
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