Data/hora: 01/06/2024 13:26:44

Provedor de dados: 	60	
País: 	Brazil	
Título: 	Formulation design and characterization of a non-ionic surfactant based vesicular system for the sustained delivery of a new chondroprotective agent	
Autores: 	Khan,Muhammad Imran; Madni,Asadullah; Ahmad,Saeed; Mahmood,Muhammad Ahmad; Rehman,Mubashar; Ashfaq,Muhammad.	
Data: 	2015-09-01	
Ano: 	2015	
Palavras-chave: 	Chondroprotective; Diacerein/dissolution profile; Diacerein/sustained release; Niosomes; Sorbitan monostearate; Reverse-phase evaporation.	
Resumo: 	Diacerein is used for symptomatic relief and cartilage regeneration in osteoarthritis. Due to gastrointestinal side effects, poor aqueous solubility and low bioavailability, its clinical usage has been restricted. The objective of the present study was to enhance its dissolution profile and to attain sustained release by designing a novel delivery system based on niosomes. Five niosomal formulations (F1-F5) with non-ionic surfactant (sorbitan monostearate) and cholesterol in varying ratios of 5:5, 6:4, 7:3, 8:2 and 9:1 were developed by the reverse-phase evaporation technique. The size and polydispersivity index (PDI) were found in the range of 0.608 µm to 1.010 µm and 0.409 to 0.781, respectively. Scanning electron microscopy (SEM) of the selected formulation (F3) revealed spherical vesicles, and 79.8% entrapment was achieved with F3 (7:3). Dissolution studies using the dialysis method showed sustained release behaviour for all formulations. The optimized surfactant-to-cholesterol concentration (7:3) in formulation F3sustained the drug-release time (T50%) up to 10 hours. Kinetic modelling exhibited a zero-order release (R2=0.9834) and the release exponent 'n' of the Korsmayer-Peppas model (n=0.90) confirmed non-fickian and anomalous release. The results of this study suggest that diacerein can be successfully entrapped into niosomes using sorbitan monostearate and that these niosomes have the potential to deliver diacerein efficiently at the absorption site.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502015000300607	
Editor: 	Universidade de São Paulo, Faculdade de Ciências Farmacêuticas	
Relação: 	10.1590/S1984-82502015000300012	
Formato: 	text/html	
Fonte: 	Brazilian Journal of Pharmaceutical Sciences  v.51 n.3 2015	
Fonte: 	info:eu-repo/semantics/openAccess