Optimising the incorporation and release of a neurotrophic factor using conducting polypyrrole

Abstract

In this study, a neurotrophin delivery system based on an inherently conducting polymer (ICP) has been developed. Direct incorporation of neurotrophin-3 (NT-3) was investigated and controlled release was tested under various electrochemical conditions. The loading capacity and amount of NT-3 released from the polymer was determined using 125I-labelled NT-3. Electrochemical stimulation of polypyrrole by pulsed voltage, pulsed current or cyclic voltammetry promoted the release of NT-3 at a greater rate than natural diffusion of NT-3. NT-3 was released from polypyrrole as an initial burst in the first 24 h followed by prolonged release over a subsequent 6 days of sampling. The amount of NT-3 in..