In vitro‒in vivo correlation of oral biodegradable curcumin nanoparticles for sustained treatment regimen of diabetics

Background: Curcumin (CUR) has the potential to treat diabetes, but its low oral bioavailability makes it challenging to use in the treatment of chronic conditions. Objectives: To investigate in vitro–in vivo correlation (IVIVC) of oral biodegradable CUR nanoparticles (NPs) for sustained treatment regimen of diabetics. Materials and Methods: In this study, CUR biodegradable NPs were prepared using Box–Behnken design to optimize the concentration of polymer and process parameters. Results: The optimized formulation was prepared using the values obtained from the Box-Behenken method, 2.5 %w/v of polymer, 3 % w/v of TPP, and 2534 rpm of stirring speed and the actual response was observed 192.31±6.82 nm particle size, 84.26±2.87 % of entrapment efficiency, and 95.22±1.81 % of drug release (Q24 h) with the desirability function of 0.910 which indicated that the model is valid. In vitro release of curcumin from nanoparticles showed prolonged drug release up to 24 h. CUR-NPs administered orally were found to have longer Tmax, higher Cmax, larger AUC, and larger MRT compared to plain CUR. IVIVC model linear regression plots (R2= 0.9949) were obtained by plotting the graph with percent absorbed versus percent dissolved for CUR-NPs. IVIVCs were established for demonstrating the relationship between in vivo absorption and in vitro release. Conclusions: From the results, it can be concluded that this novel CUR-loaded NPs have potential to improve its therapeutic efficacy.