Mono-Dendronized β-Cyclodextrin Derivatives as Multitasking Containers for Curcumin. Impacting Its Solubility, Loading, and Tautomeric Form

Abstract

In this study, three mono-dendronized β-cyclodextrin (βCD) derivatives (βCD-1G, βCD-2G, and βCD-3G) were used as multitasking containers of curcumin (CUR) to influence its aqueous solubility and tautomerism, both of which are related to its biological activity. We evaluated the relevant physicochemical properties of these containers associated with their potential hosting capacity. All mono-dendronized derivatives exhibited enhanced solubility in different solvents, including water, in comparison with native βCD. Gas-phase geometry optimizations by density functional theory (DFT) confirmed that none of the dendrons blocked the passage of CUR into the βCD cavity, and depending on the generation, different preorganization scenarios were promoted before complexation. Phase solubility diagrams showed that all the dendronized containers have superior performance for solubilizing CUR compared to native βCD. We proved that coprecipitation is most efficient than lyophilization for forming inclusion complexes (ICs) with dendronized containers. Even though βCD-3G with the largest 3G dendron exhibited the highest CUR loading, the complexation of CUR with βCD-2G provided the supramolecular system that contains CUR preferentially in its diketo tautomer, which is known for its antioxidant activity.

Inclusion and Non‐Inclusion Complexes between Curcumin and β‐Cyclodextrin with High‐Curcumin Loading and Enhanced Aqueous Solubility Obtained by Mechanochemistry

“…Previously, we reported the Cur:βCD ICs in solution. [46] Even though we achieved a significant enhancement of the aqueous solubility of Cur, its content loaded in the ICs was moderate for an evident application in nanomedicine.…”

Versátil como ninguna, la química clic y su trascendencia en áreas diversas: de la ciencia de materiales a la investigación farmacéutica

“…No obstante que el tamaño de su cavidad es el más versátil, su solubilidad acuosa es perfectible. La selectividad y eficiencia de la química clic nos permitió dendronizar a la βCD en una sola de sus siete posiciones, con dendrones de diferentes pesos moleculares, para mejorar las características de este contenedor molecular al formar CI con curcumina (Figura 6) [30].…”