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  • Title: NADES-based surfactant-free microemulsions for solubilization and extraction of curcumin from Curcuma Longa.
    Author: Huber V, Muller L, Degot P, Touraud D, Kunz W.
    Journal: Food Chem; 2021 Sep 01; 355():129624. PubMed ID: 33799268.
    Abstract:
    A choline chloride + lactic acid (1:1) natural deep eutectic solvent (NADES) is used as an adjuvant to ethanol/triacetin mixtures to solubilize and extract curcumin from Curcuma Longa. The obtained NADES/ethanol/triacetin mixtures are homogeneous, transparent and of low viscosity even in the absence of water. Dynamic light scattering revealed significant nanostructures, typical of surfactant-free microemulsions. A twofold increase of curcumin solubility and remarkable extraction power (yield of ~90%) can be achieved in the ternary system including the NADES, although curcumin is hydrophobic and the used NADES are very polar. Due to the elevated solubility of curcumin, more extraction cycles can be made than in the previously published aqueous systems with the same amount of solution. As a result, less solvent is required to achieve the same extraction yield.
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