Examinando por Autor "Gutiérrez-Guzmán, Nelson"

Mostrando 1 - 2 de 2
  • Miniatura
    PublicaciónAcceso abierto
    Determinación del color del exocarpio como indicador de desarrollo fisiológico y madurez en la guayaba pera (psidium guajava cv. guayaba pera), utilizando técnicas de procesamiento digital de imágenes
    (2013-10-23) Castro-Camacho, J. K. (Jennifer Katiusca); Cerquera-Peña, N. E. (Néstor Enrique); Gutiérrez-Guzmán, Nelson
    The colorimetric coordinates analysis of digital images in samples pear guava fruits (Psidium guajava cv. Pear guava) was performed for three times of harvest: traditional harvesting at 120 days after flowering (T1), early harvesting at 112 days after flowering (T2) and, early harvesting at 110 days after flowering (T3), the three group of samples were stored at environmental conditions at a temperature of 26 ºC and 58% of relative humidity and under refrigeration at 7.5 ºC and 85% relative humidity. For color determination two color spaces were used: RGB and CIE-L*a*b*, each of these spaces describes the color of the skin using three components that allow the comparison of its evolution during each step of postharvest. The results showed a typical evolution from deep green, freshly harvested, to light green yellowish colors. The found coordinates allow the reproduction of the colors of the evolution of ripening in printing devices configured in RGB coordinates. From the physicochemical parameters assessed, the respiration rate of the fruit is the most correlated with the change of color during the post-harvest stage.
  • Miniatura
    PublicaciónAcceso abierto
    Evaluación de prerrequisitos en el sistema HACCP en empresas del sector agroalimentario
    (2013-11-18) Gutiérrez-Guzmán, Nelson; Pastrana-Bonilla, E. (Eduardo); Castro-Camacho, J. K. (Jennifer Katiusca)
    This paper presents an analysis of the hygiene management based on the compliance with the prerequisites of a HACCP system in 53 agri-food industries operating in the department of Huila in Colombia. The evaluation methodology corresponded to the verification of the compliance of checklists for two instruments: GHYCAL (Management of Hygiene and Quality) and S&Q (Safety and Quality on Food). The results allowed to find levels of hygiene management on a percentage scale and classify 34 companies in low level of compliance, including levels between 0 % and 75 %; 12 companies in basic compliance level, to obtain ratings from 75 % to 95 %, and 7 companies with higher compliance level, with evaluations higher than 95 %; additionally the similarities and differences between companies and between the sectors studied, using multivariate statistical analysis, were assessed.