Curcumin Protects Skin against UVB-Induced Cytotoxicity via the Keap1-Nrf2 Pathway: The Use of a Microemulsion Delivery System

Table 3

Best-fit parameters for the core and shell model (Eq. 1-2), with 95% confidence bounds of the fit. Rc is the radius of the core, Rs is the radius of the droplet, and σ is the standard deviation of Rc ().

Parameter	Empty microemulsion	Microemulsion containing; curcumin
Rc (nm)	3.85 ± 0.04	3.87 ± 0.07
Rs (nm)	5.39 ± 0.07	5.17 ± 0.04
Shell density; (el/nm^3)	36.34 ± 1.24	48.19 ± 2.08
σ	0.57 ± 0.02	0.61 ± 0.02