Wednesday, November 7, 2007
517b

Relation Between Flow And Electrical Properties Of Pharmaceutical Blends

Kalyana Pingali, Fernando. J Muzzio, Troy Shinbrot, and Maria. S Tomassone. Department of Chemical and Biochemical Engineering, Rutgers University, 98 Brett Road, Piscataway, NJ 08854

Multiple formulations of pharmaceutical powders were prepared and were characterized for their electrical and flow properties. Several combinations of excipients consisting of avicel 102, regular lactose, pharmatose were mixed with magnesium stearate as a lubricant. Ionic and conductive materials were added as additives. Charge density, conductivity, flow index and dilation were measured for all the blends. All the powders were subjected to a controlled shear environment in a Rutgers shear cell rheometer and their flow and electrical properties were measured. Sheared and non-sheared powders were compared and a correlation was found to exist between flow and electrical properties. Flow index was proportional to dilation for most of the pharmaceutical blends. A best fit of correlation was found for pharmatose blend consisting of a cohesive drug. Dilation was linearly proportional to the impedance for sheared and non-sheared powders. It was found that sheared samples accumulate charge but increase conductivity.