Lecithin-based mixed polymeric micelles for activity improvement of curcumin against <i>Staphylococcus aureus</i>

Considering cellular uptake promotion of lecithin and high expression of phospholipase in <i>S. aureus</i>, we designed curcumin (Cur)-loaded soy lecithin-based mPEG-PVL copolymer micelles (MPPC). The effect of soy lecithin on the anti<i>-S. aureus</i> activity of the formulation was studied with cur-loaded mPEG-PVL micelles (MPC without soy lecithin) as control. It was found that MPPC enhanced the water-solubility of Cur, and showed slow and sustained release behavior of Cur. Although MPPC had the same anti-<i>S. aureus</i> activity as Cur, its activity was significantly higher than MPC due to the cellular uptake promotion of soybean lecithin. It was noted that MPPC had good inhibition or destruction effect on biofilm, significant cell membrane damage, strong inhibition effect on protease or lipase production, and obvious induction effect on ROS expression when compared with Cur and MPC. So, the introduction of soy lecithin could improve the antibacterial activity of Cur. The lecithin-based micelles would offer potential to deliver antibacterial drugs for improved therapeutic action.