Pharmacokinetic Characteristics of Capsaicin-Loaded Nanoemulsions Fabricated with Alginate and Chitosan

Nanotechnologies are being employed to enhance the stability and oral bioavailability of lipophilic substances, such as capsaicin. This study aimed to examine the pharmacokinetic properties of the formulated capsaicin-loaded nanoemulsions. A pharmacokinetic study was carried out using double-layer nanoemulsions fabricated with alginate and chitosan polymers and triple-layer nanoemulsions fabricated with chitosan/alginate polymers. Capsaicin nanoemulsions and capsaicin control (oleoresin capsicum) were administered to the rat at a dose of 10 mg/kg. A statistically significant difference was found in the area under the curve from time zero to time infinity (AUC(inf)) among formulations (p < 0.01). In comparison to the control group, the relative bioavailability of formulated nanoemulsions was up to 131.7. The AUC(inf) increased in a nano-size-dependent manner; as nano size decreased, AUC(inf) increased. IN comparison to the double-layer nanoemulsions, the triple-layer nanoemulsion showed a significantly increased volume of distribution, resulting in the increased clearance and decreased AUC(inf). It was concluded that the formulated nanoemulsions could significantly enhance the bioavailabilty of capsaicin.