Isolation, characterization, and encapsulation of a lupeol-rich fraction obtained from the hexanic extract of Coccoloba uvifera L. leaves

Abstract

Aim: This study aimed to isolate, characterize, and encapsulate a lupeol-rich fraction obtained from the hexanic extract of Coccoloba uvifera L. leaves to evaluate its potential use in nutraceutical or pharmaceutical applications. Methods: The C. uvifera leaf extract was fractionated by column chromatography and the presence of lupeol was assessed by thin layer chromatography, attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy, nuclear magnetic resonance (NMR), and liquid chromatography-mass spectrometry (LC-MS). Additionally, the lupeol-rich fraction was characterized according to its antioxidant capacity and cytotoxicity. Finally, this fraction was encapsulated into electrospun nanofibers made of high degree of polymerization agave fructans (HDPAF) combined with polyethylene oxide (PEO). The obtained nanofibers were characterized in terms of morphology, chemical composition, and in vitro permeability using the Caco-2 cell line. Results: Fraction 6 showed a 77% of lupeol, quantified by chromatography, and presented a 7.3% inhibition of 2,2-diphenyl-1-picrylhydrazyl (DPPH). 100 µg/mL of fraction 6 showed a decrease in Caco-2 cell viability. Finally, fraction 6 was encapsulated into electrospun nanofibers, which showed an increase in the apparent permeability of the lupeol present in fraction 6 in Caco-2 cells in comparison to neat fraction 6. Conclusions: It was possible to isolate and encapsulate a lupeol-rich fraction from C. uvifera into electrospun nanofibers, which allows the increasing the apparent permeability of lupeol, and consequently, they could be used for nutraceutical or pharmaceutical applications.

Keywords

• coccoloba uvifera leaves
• lupeol-rich fraction
• cytotoxicity
• electrospinning
• in vitro caco-2 permeability