Production of antihyerglycemic and antihypertensive drug loaded sustained release nanoparticles using spray drying technique: Optimization by Placket Burman Design.

Repaglinide (RPG, antidiabetic) and Diltiazem HCL (DIL, antihypertensive) loaded ethyl cellulose (EC) nanoparticles were prepared by the spray drying process using Placket Burman Design (PBD). The amount of EC (A, mg), Methanol (B, ml), Inlet temperature (C, OC), Feed rate (D, rpm), Nozzle diameter (E, mm) and Aspiration (F, rpm) were considered independent variables while EE of RPG (Y1) and EE of DIL (Y2) were selected as dependent variables. The optimized DIL and RPG loaded EC nanoparticles were further used for the development of oral fast disintegrating sustained release tablets by direct compression method. The tablets were evaluated for weight variation, thickness, hardness, disintegration time, friability and dissolution test. FTIR study showed no chemical interaction between drug and polymer. Scanning electron microscope showed spherical as well as oval shape and discrete nature of both nanoparticles. The physical parameters of oral fast disintegrating tablets developed with optimized formulation of drug loaded nanoparticles were found within the range. Drug loaded nanoparticles as well as oral fast disintegrating tablets showed very good sustained release behavior. [ABSTRACT FROM AUTHOR]