Rheological and drug-release behaviour of a scleroglucan gel matrix at different drug loadings

The aim of this study was to investigate the drug-loading effects on release and mechanical properties of a scleroglucan gel, with the intention of considering them in delivery systems formulations. The rheological and kinetic properties of a 2% w/w scleroglucan gel matrix loaded and 0, 0.02, 0.04,...

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Autor principal: François, Nora Judith
Otros Autores: Rojas, A.M, Daraio, Marta Edit
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: 2005
Acceso en línea:Registro en Scopus
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100 1 |a François, Nora Judith 
245 1 0 |a Rheological and drug-release behaviour of a scleroglucan gel matrix at different drug loadings 
260 |c 2005 
270 1 0 |m Daraio, M.E.; Laboratorio de Química de Sistemas Heterogéneos, Departamento de Química, Facultad de Ingeniería, Paseo Colón 850, C1063ACV Buenos Aires, Argentina; email: medit@fi.uba.ar 
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506 |2 openaire  |e Política editorial 
520 3 |a The aim of this study was to investigate the drug-loading effects on release and mechanical properties of a scleroglucan gel, with the intention of considering them in delivery systems formulations. The rheological and kinetic properties of a 2% w/w scleroglucan gel matrix loaded and 0, 0.02, 0.04, 0.06, 0.2 0.4% w/w of theophylline (Th, used as a model drug) were investigated. Rheological measurements were performed in a controlled-stress rotational-shear rheometer under isothermal conditions. For theophylline release from the gel a flat Franz cell was used and the kinetic parameters were derived applying a semi-empirical power law. The influence of scleroglucan molar weight on kinetic and rheological behaviour was also studied. Results suggest two possible effects of drug loading on the gel network: in the 0.04-0.06% w/ w Th range a plasticizing effect and in the 0.2-0.4% w/w Th range a rigidization effect. In the first range mentioned, the changes in the gel structural properties tested by means of rheological measurements are coincident with changes in drug-release kinetics. © 2005 Society of Chemical Industry.  |l eng 
593 |a Laboratorio de Química de Sistemas Heterogéneos, Departamento de Química, Facultad de Ingeniería, Paseo Colón 850, C1063ACV Buenos Aires, Argentina 
593 |a Departamento de Industrias, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, C1428EHA Buenos Aires, Argentina 
690 1 0 |a BIOPOLYMER 
690 1 0 |a DRUG LOADING 
690 1 0 |a DRUG RELEASE 
690 1 0 |a DYNAMIC RHEOLOGY 
690 1 0 |a SCLEROGLUCAN 
690 1 0 |a THEOPHYLLINE 
690 1 0 |a BIOPOLYMERS 
690 1 0 |a CONTROLLED DRUG DELIVERY 
690 1 0 |a MATERIALS TESTING 
690 1 0 |a MOLECULAR STRUCTURE 
690 1 0 |a MOLECULAR WEIGHT 
690 1 0 |a PHARMACOKINETICS 
690 1 0 |a RHEOLOGY 
690 1 0 |a DRUG LOADINGS 
690 1 0 |a DRUG-RELEASE BEHAVIOUR 
690 1 0 |a DYNAMIC RHEOLOGY 
690 1 0 |a GEL STRUCTURAL PROPERTIES 
690 1 0 |a SCLEROGLUCAN GEL MATRIX 
690 1 0 |a THEOPHYLLINE 
690 1 0 |a GELS 
690 1 0 |a DRUG DELIVERY 
700 1 |a Rojas, A.M. 
700 1 |a Daraio, Marta Edit 
773 0 |d 2005  |g v. 54  |h pp. 1613-1619  |k n. 12  |p Polym. Int.  |x 09598103  |t Polymer International 
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856 4 0 |u https://doi.org/10.1002/pi.1889  |y DOI 
856 4 0 |u https://hdl.handle.net/20.500.12110/paper_09598103_v54_n12_p1613_Francois  |y Handle 
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