Girardon, Maxime, et al. Journal of Molecular Liquids 308 (2020): 113040.
The interfacial behavior of the model anti-inflammatory drug curcumin in combination with cetyl palmitate and 1,2-dioleoyl-sn-glycero-3-phosphocholine was investigated. Cetyl palmitate can be utilized for topical delivery via nanostructured lipid carriers, while phosphatidylcholine can serve as a component of the carrier and as a model membrane lipid. In this study, surface pressure, thermodynamics, Brewster angle microscopy, molecular dynamics, and polarization-modulated infrared reflection-absorption spectroscopy were employed to better understand the interactions between the delivery system components and their interactions with biological membranes. Additionally, the impact of curcumin on these lipid systems, especially on the model membranes, was analyzed thermodynamically.
The results indicated that a mixture of curcumin and cetyl palmitate could form a Langmuir film, while neither of the pure components alone could achieve this. This effect was explained by the formation of a complex between curcumin and the hydrophobic, water-insoluble cetyl palmitate. The hydrophilic-hydrophobic balance of the complex allows it to penetrate the monolayer and mix with the phospholipids. This finding could be beneficial for the further design of plant-based lipids for drug delivery applications.