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Characterisation of ethylcellulose films containing natural polysaccharides by thermal analysis and FTIR spectroscopy

Albuquerque Cavalcanti, Osvaldo et al · SEDICI UNLP · 2004

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Author / responsible party
Albuquerque Cavalcanti, Osvaldo et al
Publisher
SEDICI UNLP
Year
2004
Language
English

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a etilcelulosa (EC) ha sido ampliamente usada como material adecuado en el desarrollo de nuevos sistemas para liberación modificada de fármacos. Algunos oligo-polisacáridos como inulina (IN), goma guar(GG) y sus derivados han sido propuestos como materiales biodegradables para liberación específica de sitio. El objetivo de este estudio fue caracterizar películas aisladas de EC asociadaa a alguno de los siguientes oligo-polisacáridos: IN, GG y levana (LEV). Las técnicas usadas fueron: análisis térmico (TG y DSC) y espectroscopía de infrarojo com transformada de Fourier (FTIR). Para obtener las películas, un volumen determinado de cada dispersión acuosa (EC/IN, EC/GG, EC/LEV) fue colocado en placa de teflon y luego evaporado el solvente. Los espectros FTIR sugieren la existencia de interacciones de cadenas poliméricas en los sistemas EC/IN y EC/LEV por dislocamientos de la banda debida a la vibración de O-H. En las curvas de TG y DSC también fueron observadas algunas variaciones. La temperatura en la cual la velocidad de la primera etapa de degradación térmica pasa por un máximo (Tmax1) y la frequencia en la cual la banda de O-H está centrada ((OH) presentaron un comportamiento semejante en los sistemas estudiados. Ethylcellulose (EC) has been widely used as a coating material for controlled release systems. Some oligo-polysaccharides such as inulin (IN), guar gum (GG) and their derivatives have been proposed as biodegradable materials for site-specific releases. The objective of this study was to characterise free films composed of EC associated to IN or GG or levan (LEV) using thermal analysis and FTIR spectroscopy. Polymer dispersions of EC/IN, EC/GG or EC/LEV, containing up 30% of the oligo-polysaccharide, were used for film casting on a Teflon? plate. The FTIR spectra obtained suggest hydrogen bond interactions of EC/IN and EC/LEV polymeric chains. The thermal analysis (TGA and DSC) of the blends showed temperature dislocations of some parameters. It was observed that Tmax1 (temperature at which a thermal degradation rate goes up to a maximum) and (OH (wavenumber at which the OH absorption band are centralised) show similar trends in the composition range of the studied blends. Colegio de Farmacéuticos de la Provincia de Buenos Aires

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APA 7

Albuquerque Cavalcanti, O. E. A. (2004). Characterisation of ethylcellulose films containing natural polysaccharides by thermal analysis and FTIR spectroscopy. http://sedici.unlp.edu.ar/handle/10915/6620

MLA

Albuquerque Cavalcanti, Osvaldo et al. "Characterisation of ethylcellulose films containing natural polysaccharides by thermal analysis and FTIR spectroscopy." 2004. http://sedici.unlp.edu.ar/handle/10915/6620.

Chicago

Albuquerque Cavalcanti, Osvaldo et al. 2004. "Characterisation of ethylcellulose films containing natural polysaccharides by thermal analysis and FTIR spectroscopy.". http://sedici.unlp.edu.ar/handle/10915/6620.

Harvard

Albuquerque Cavalcanti, O. E. A. 2004, Characterisation of ethylcellulose films containing natural polysaccharides by thermal analysis and FTIR spectroscopy, SEDICI UNLP, available at: http://sedici.unlp.edu.ar/handle/10915/6620 [Accessed 9 Aug. 2026].

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Title
Characterisation of ethylcellulose films containing natural polysaccharides by thermal analysis and FTIR spectroscopy
Author / contributors
Albuquerque Cavalcanti, Osvaldo et al
Publisher
SEDICI UNLP
Publication year
2004
Language
English

Subjects

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Farmacia; etilcelulosa; mezclas poliméricas; oligo-polisacáridos; películas poliméricas; blends; ethylcellulose; oligo-polysaccharides; polymeric films
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