Chitosan-genipin microspheres for the controlled release of drugs: clarithromycin, tramadol and heparin.
Mar Drugs
; 8(6): 1750-62, 2010 May 26.
Article
em En
| MEDLINE
| ID: mdl-20631867
ABSTRACT
The aim of this study was to first evaluate whether the chitosan hydrochloride-genipin crosslinking reaction is influenced by factors such as time, and polymer/genipin concentration, and second, to develop crosslinked drug loaded microspheres to improve the control over drug release. Once the crosslinking process was characterized as a function of the factors mentioned above, drug loaded hydrochloride chitosan microspheres with different degrees of crosslinking were obtained. Microspheres were characterized in terms of size, morphology, drug content, surface charge and capacity to control in vitro drug release. Clarithromycin, tramadol hydrochloride, and low molecular weight heparin (LMWH) were used as model drugs. The obtained particles were spherical, positively charged, with a diameter of 1-10 microm. X-Ray diffraction showed that there was an interaction of genipin and each drug with chitosan in the microspheres. In relation to the release profiles, a higher degree of crosslinking led to more control of drug release in the case of clarithromycin and tramadol. For these drugs, optimal release profiles were obtained for microspheres crosslinked with 1 mM genipin at 50 °C for 5 h and with 5 mM genipin at 50 °C for 5 h, respectively. In LMWH microspheres, the best release profile corresponded to 0.5 mM genipin, 50 °C, 5 h. In conclusion, genipin showed to be eligible as a chemical-crosslinking agent delaying the outflow of drugs from the microspheres. However, more studies in vitro and in vivo must be carried out to determine adequate crosslinking conditions for different drugs.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Tramadol
/
Claritromicina
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Heparina de Baixo Peso Molecular
/
Preparações de Ação Retardada
/
Quitosana
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Glicosídeos Iridoides
/
Microesferas
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
Mar Drugs
Assunto da revista:
BIOLOGIA
/
FARMACOLOGIA
Ano de publicação:
2010
Tipo de documento:
Article
País de afiliação:
Espanha