Although previous researchers have successfully utilized the UVabsorption of probe molecules to determine the CMC [8–10], themechanistic aspects for this method have not been addressed. Aclose inspection of the related literature reveals that the reportedconcentration of the probe compounds in the UV absorption mea-surements is much higher than their solubility. For instances, Rayet al. [8] and Tanhaei et al. [10] used 2 M (404 g/L) of pyrene,which is about 3 times of the pyrene solubility (135 g/L); Mondaland Ghosh [9] employed 9.1 M (3352 g/L) of curcumin, whichalso far exceeds its water solubility of 11 g/L at pH 5.0 [14]. In thepresence of the supersaturated probe chemicals, the UV absorbanceincreases sharply with increasing concentration of surfactants. Forinstance, the total absorbance of curcumin increased from 0.17 to0.65 (almost 4 times) when the concentration of SDS increased from0.25 to 15 mM [9]. Numerous studies have shown that surfactantscan enhance the aqueous solubility of pyrene [15–17]. Therefore,the remarkable rise in UV absorbance of the probe molecules islikely associated with the surfactant-enhanced solubility of theprobe chemical.