Modelo de predicción probabilística de deterioro en jamón de cerdo cocido
DOI:
https://doi.org/10.17533/udea.vitae.v25n2a02Abstract
Antecedentes: el deterioro del jamón cocido es un proceso complejo que puede manifestarse por alteraciones de tipo microbiológico, fisicoquímico y sensorial, que hasta hoy han sido determinadas por metodologías tradicionales que incluyen largos periodos de seguimiento y un número importante de muestras. Objetivos: en el presente estudio se propuso un modelo para la predicción probabilística del deterioro de jamón cocido, por medio de análisis de componentes principales (ACP) y regresión logística con aproximación bayesiana. Métodos: para realizar el análisis, se evaluaron muestras provenientes de 300 lotes independientes de jamón de cerdo cocido, los cuales se conservaron en cámaras de almacenamiento a temperaturas de 12±1°C. Se determinaron experimentalmente tres tipos de variables: fisicoquímicas (pH, sinéresis, nitritos residuales, porcentaje de ácido láctico), de textura (adhesividad, dureza, trabajo de punción y firmeza instrumental) y microbiológicas (mesófilos aerobios y bacterias acidolácticas) en dos tiempos de medición: 3 y 40 días. Para realizar la creación del modelo se seleccionaron aleatoriamente el 60% de los datos y para la validación el 40% restante. Los datos obtenidos fueron procesados con el paquete estadístico R Core Team 2012. Resultados: los nitritos residuales y la sinéresis fueron las variables más representativas, ya que su distribución, correlación y carga, fueron las más significativas, con mayor poder discriminante del fenómeno de deterioro en los dos momentos de medición. El modelo desarrollado permitió correlacionar los parámetros estudiados y predecir la probabilidad de deterioro del jamón, además de clasificarlo de acuerdo a su estado de calidad. La primera componente principal (CP1) (variables bioquímicas) explicó el 73,3 % de la variación total de los datos, siendo los nitritos residuales y la sinéresis los factores más relacionados con el deterioro. Conclusión: el modelo logístico con aproximación bayesiana permitió obtener la probabilidad de deterioro del jamón cocido, almacenado a 12°C usando parámetros fisicoquímicos. La aplicación del ACP permitió correlacionar y clasificar los factores de deterioro del producto.Downloads
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