Development of spray dried liposomal dry powder inhaler of Dapsone

AAPS PharmSciTech
Mahavir ChouguleAmbikanandan Misra

Abstract

This investigation was undertaken to evaluate practical feasibility of site specific pulmonary delivery of liposomal encapsulated Dapsone (DS) dry powder inhaler for prolonged drug retention in lungs as an effective alternative in prevention of Pneumocystis carinii pneumonia (PCP) associated with immunocompromised patients. DS encapsulated liposomes were prepared by thin film evaporation technique and resultant liposomal dispersion was passed through high pressure homogenizer. DS nano-liposomes (NLs) were separated by ultra centrifugation and characterized. NLs were dispersed in phosphate buffer saline (PBS) pH 7.4 containing different carriers like lactose, sucrose, and hydrolyzed gelatin, and 15% L-leucine as antiadherent. The resultant dispersion was spray dried and spray dried formulation were characterized to ascertain its performance. In vitro pulmonary deposition was assessed using Andersen Cascade Impactor as per USP. NLs were found to have average size of 137 +/- 15 nm, 95.17 +/- 3.43% drug entrapment, and zeta potential of 0.8314 +/- 0.0827 mV. Hydrolyzed gelatin based formulation was found to have low density, good flowability, particle size of 7.9 +/- 1.1 microm, maximum fine particle fraction (FPF) of 75.6 +/- 1.6%...Continue Reading

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Related Concepts

Drug Carriers
Phosphate buffers
Inhalation of Drugs
Lung
AP5Z1 gene
Dapsone
Drug Retention
Pneumocystis Infections
Nanostructured Materials
Centrifugation

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