Nanoparticle encapsulation using self-assembly abietic acid to improve oral bioavailability of curcumin.

This research constructed composite nanoparticles (NPs) using abietic acid (AA) as a carrier for significantly enhancing the bioavailability of curcumin (CCM). CCM-loaded AA NPs were synthesized using a low-energy microemulsification method, and the obtained nanoparticles had a spherical morphology with an average diameter of 458.66 nm, a narrow size distribution and a negative surface charge of -19.13 mV. The encapsulation efficiency of CCM was 17.98 %, while its solubility was 20-fold that of free curcumin. FITR, UV, and MD revealed hydrogen bonds and hydrophobic forces between AA and CCM. Thein-vitrorelease profile showed sustainable release of CCM in simulated gastric and intestinal fluids up to 2 h at 37 °C. In cellular studies, CCM-loaded AA NPs with the same CCM concentration exhibited greater bioaccessibility and bioavailability than free CCM. These data suggested a possible utilization of AA NPs in improving water solubility, bioavailability and activity of lipophilic bioactive food factors.