Abstract
Physico-spectroscopic data of deep eutectic solvent (DES, aquolines (choline chloride, ChCl: water (1:2 (DES I), 1:3 (DES II), 1:4 (DES III), and 1:5 (DES IV)) have been collected. The data differentiates DES I to DES III (DESs) from DES IV (molecular solution of ChCl). DESs (aquolines) are used to study association structures of surfactant + salt systems using spectrofluorometry, polarizing optical microscopy (POM), and dynamic light scattering (DLS). POM images show the formation of giant aggregates (vesicles, up to 3.3 µm) in DTAB – aquoline – salt system which was further confirmed using DLS. These systems show excessive solubility enhancement of the poorly water-soluble curcumin (CCM), a well-known natural drug and food ingredient. Solubility of CCM shows the following order: water < DES < DES + salt < DTAB-DESs < DTAB-salt-aquoline. CCM shows up to 250-fold solubility in DTAB-KNO3-DES I system compared to water. The work forging a new methodology of achieving giant amphiphilic aggregates and their application in improving the aqueous solubilities/extraction of hydrophobic materials.
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