Isotermas de adsorción de bioplásticos de harina de yuca moldeados por compresión

  • Diana Paola Navia Universidad del Cauca
  • Alfredo Ayala Aponte Universidad del Valle
  • Héctor Samuel Villada Castillo Universidad del Cauca.
Palabras clave: Adsorción, Moldeo por compresión, Yuca, Biopolímeros.

Resumen

Se evaluó la adsorción de agua y el calor isostérico de bioplásticos elabora- dos con harina de dos variedades de yuca (CM 7951-5 y MBRA 383), polvillo de fique y glicerol con la técnica de moldeo por compresión. Las isotermas de adsorción de las muestras poliméricas se realizaron a 15, 25, y 35°C en valores de actividad de agua que variaron entre 0.12 y 0.98, usando un mé- todo gravimétrico. Los valores experimentales de adsorción de agua fueron ajustados usando los modelos de GAB, Caurie, Oswin, Smith, Henderson y Peleg. El calor isostérico de adsorción (Qst) se determinó mediante la ecuación de Clausius-Clapeyron. Los resultados mostraron que el modelo de Peleg se ajustó adecuadamente a valores experimentales de adsorción a 15, 25 y 35°C en las muestras elaboradas con la variedad CM 7951-5 y a 15 y 25°C para la variedad MBRA 383, mientras que el modelo de GAB fue a 35°C para MBRA 383. El calor isostérico de sorción disminuyó con el incremento en el contenido de humedad de equilibrio alcanzándose un valor máximo de 87 Kj/mol y 78 Kj/mol y un mínimo de 44.6 Kj/mol y 44.5 Kj/mol en las muestras elaboradas con CM 7951-5 y MBRA 383 respectivamente.

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Biografía del autor/a

Diana Paola Navia, Universidad del Cauca
Ing. Agroindustrial, Estudiante de Maestría y Doctorado en Ingeniería de Alimentos, Universidad del Valle. Docente Departamento de Agroindustria, Facultad de Ciencias Agropecuarias, Universidad del Cauca
Alfredo Ayala Aponte, Universidad del Valle
Doctor en Ciencia y Tecnología de Alimentos, Docente Escuela de Ingeniería de Alimentos, Universidad del Valle
Héctor Samuel Villada Castillo, Universidad del Cauca.
Doctor en Ingeniería de Alimentos, Docente Departamento de Agroindustria, Facultad de Ciencias Agropecuarias, Universidad del Cauca

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Cómo citar
Navia, D. P., Ayala Aponte, A., & Villada Castillo, H. S. (2011). Isotermas de adsorción de bioplásticos de harina de yuca moldeados por compresión. Biotecnología En El Sector Agropecuario Y Agroindustrial, 9(1), 77–87. Recuperado a partir de https://revistas.unicauca.edu.co/index.php/biotecnologia/article/view/757
Publicado
2011-07-01
Sección
Artículos originales