Abstract

The solubility of 5-ffuorouracil (5-FU), a widely used chemotherapeutic agent to treat solid tumors, which include colorectal, head and neck, breast, and lung cancer, was determined at temperatures ranging from 278.15 to 333.15 K in 11 pure solvents and binary water + ethanol solvent mixtures using the polythermal method. It was demonstrated that the solubility of 5-FU increases with increasing temperature in the pure solvents and at constant solvent composition in the solvent mixtures. Moreover, the solubility of 5-FU in the solvent mixtures exceeds its solubility in pure water and ethanol. The experimental solubility data of 5-FU in the pure solvents and solvent mixtures were correlated using the modified Apelblat and λh model equations. The predicted solubility data obtained agree with the experimental data based on the calculated relative deviation (RD) and the average relative deviation (ARD%) values. The selected solvents are categorized as either Class 2 or 3 (less toxic and lower risk to human health) solvents, and hence the correlated and experimentally derived solubility data of 5-FU presented provide a pathway to develop and engineer enhanced pharmaceutical processes and products based on this compound.

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