Optimization of Docetaxel-Zedoary Turmeric Oil Magnetic Solid Lipid Nanoparticle Preparation by Central Composite Design-Response Surface Methodology

To optimize the formulation of docetaxel-zedoary oil magnetic solid lipid nanoparticles (DTX-ZTO-MSLN) using central composite design-response surface methodology. First, the formulation and preparation process of DTX-ZTO-MSLN were optimized via design-response surface methodology. The appearance, particle size, thermogravimetric, pH, iron content, magnetic strength, and in vitro drug release of DTX-ZTO-MSLN were subsequently examined. Finally, the antitumor effect of DTX-ZTO-MSLN on MCF-7 breast cancer cells was measured via the 3-[4,5-dimethylthiazol-2-yl]-2,5 diphenyl tetrazolium bromide (MTT) assay. The optimized formulation was as follows: the mass ratio of soybean phospholipid to poloxamer 188 was 0.34, the mass ratio of DTX-ZTO to glycerol monostearate was 3.23, and 29.42 mL of water was used. The DTX-ZTO-MSLN prepared by the optimized method was clear and transparent, with good stability, with an iron content of 7.38%, and a saturation magnetization intensity of 7.05 A·m²·kg^-1. The in vitro drug release was consistent with the Weibull model (R² = 0.9992). Compared with zedoary turmeric oil and docetaxel, DTX-ZTO-MSLN had a much greater inhibitory effect on MCF-7 cells (p < 0.05). The optimized DTX-ZTO-MSLN meets the quality requirements for nanoemulsions. This study provides a theoretical basis for developing and applying DTX-ZTO-MSLN.