Evaluation of acrylamide grafted moth bean starch as controlled release excipient

The aim of this study was to investigate the applicability of acrylamide grafted moth bean starch as controlled release matrix former. Lamivudine was used as model drug and its controlled release tablets were formulated using various concentration of grafted copolymer. The grafted copolymer was tested for acute toxicity and drug–excipient compatibility study. The formulations were evaluated for physical characteristics like hardness, friability, % drug content and weight variations. The in vitro release study showed that the optimized formulation exhibited highest correlation (R) value in case of Higuchi model and the release mechanism study proved that the formulation showed a combination of diffusion and erosion based release process. There was a significant difference in the pharmacokinetic parameters (Tmax, Cmax, AUC, Vd, T1/2 and MDT) of the optimized formulation as compared to the marketed conventional tablet Lamivir®, which confirmed controlled release potential of acrylamide grafted copolymer.