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. 2022 Mar 27;15(7):2472. doi: 10.3390/ma15072472

Figure 6.

Figure 6

Experimental solubility of caffeine, expressed as its mole fractions, in binary solvents comprising water and 4-formylmorpholine in varying compositions. On the abscissa, x*2 represents the mole fractions of organic solvent in solute-free binary solutions. Temperature was set to 25 °C and solubility values obtained in DMSO were shown for comparison.