Isotermas dinámicas de sorción y análisis termodinámico de granos de quinua

Autores/as

  • Brislyn Osmayo Huacan Universidad Nacional de Moquegua - Escuela Profesional de Ingeniería Agroindustrial, Moquegua, Peru.
  • Ciro Suca-Colana Universidad Nacional de Moquegua - Escuela Profesional de Ingeniería Agroindustrial, Moquegua, Peru.
  • Jhony Mayta-Hancco Universidad Nacional de Moquegua - Escuela Profesional de Ingeniería Agroindustrial, Moquegua, Peru.

DOI:

https://doi.org/10.17268/

Palabras clave:

Quinua, isotermas de sorción, actividad de agua crítica, propiedades termodinámicas, DDI, DVS

Resumen

Las isotermas de sorción de dos variedades de granos de quinua (Chenopodium quinoa) fueron determinados usando los métodos DVS y DDI a tres temperaturas (20, 30 y 40 °C) en un rango de actividad de agua de 0,1 – 0,9. Las isotermas DDI fueron usadas para determinar la actividad de agua crítica aplicando de la segunda derivada Savistky-Golay. Siete modelos matemáticos fueron usados para ajustar los datos experimentales de sorción. Calor isostérico de sorción, entropía de sorción, energía libre de Gibbs y compensación entalpía-entropía fueron evaluadas. Los resultados indicaron que el contenido de humedad en equilibrio de los granos de quinua (PK y BJ) tienden a incrementar junto a la actividad de agua y la disminución de la temperatura. Las isotermas de los granos de quinua (PK y BJ) presentaron una forma sigmoidal tipo II. Los modelos Chung-Pfost y Smith fueron los mejores ajustados a los datos experimentales. La región de la actividad de agua crítica para los granos de quinua fue 0,75~0,85. El calor isostérico de sorción, entropía de sorción disminuyeron al incremento del contenido de humedad. Así mismo el incremento de contenido de humedad y temperatura influyeron en el decrecimiento de los valores de energía libre de Gibbs. La compensación entalpía-entropía fue corroborada (Tβ  ≠ Thm), los procesos fueron llevados a cabo por la entalpía (Tβ  > Thm) y son espontáneos (∆G > 0).

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2026-08-26

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Isotermas dinámicas de sorción y análisis termodinámico de granos de quinua. (2026). Agroindustrial Science, 16(3), 349-361. https://doi.org/10.17268/

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