Water Sorption of Amaranthus cruentus L. Seeds Modelled by GAB Equation

The GAB (Guggenheim, Andersen, and de Boer) equation was adjusted to literature data of sorption of Amarunthus cruentus L. (Me vs. a w for adsorption and desorption) determined at 25,30, 35,40,45, 50, 55,65,70, and 90°C, in the range of water activity from 0.029 to 0.979. To quantify the goodness of...

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Autores principales: Pagano, A. M., Mascheroni, Rodolfo Horacio
Formato: Articulo
Lenguaje:Inglés
Publicado: 2003
Materias:
Ciencias Exactas
Amaranth
Desorption
GAB model
Isotherms
Sorption
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84648
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-84648
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Amaranth
Desorption
GAB model
Isotherms
Sorption
spellingShingle Ciencias Exactas
Amaranth
Desorption
GAB model
Isotherms
Sorption
Pagano, A. M.
Mascheroni, Rodolfo Horacio
Water Sorption of Amaranthus cruentus L. Seeds Modelled by GAB Equation
topic_facet Ciencias Exactas
Amaranth
Desorption
GAB model
Isotherms
Sorption
description The GAB (Guggenheim, Andersen, and de Boer) equation was adjusted to literature data of sorption of Amarunthus cruentus L. (Me vs. a w for adsorption and desorption) determined at 25,30, 35,40,45, 50, 55,65,70, and 90°C, in the range of water activity from 0.029 to 0.979. To quantify the goodness of fit, the correlation coefficient (R2), the sum of squares (RSS), the standard error of the estimate (Sy), the mean relative deviation (MRD) and the plots of residuals were analysed. The three theoretical parameters of the GAB model (Mo, C, and K) gave a good correlation (R2 > 0.9817, RSS < 0.0297, MRD < 0.138, Sy < 0.0143, and random residuals-plots) in the range of a w from 0.029 to 0.979, of interest in seed storage and processing. However this correlation does not consider the effect of temperature (T) on coefficient values. In a second stage, parameters Mo and K were adjusted at each temperature. Very low variances were obtained in the range 25-65°C for desorption and in the range 25-55°C for adsorption. These results suggested that Mo and K remain almost constant and a correlation with T is not justified. On the contrary sense, parameter C showed stronger variation with T. This was explained by the analysis of sensitivity for the influence of C on moisture content. On this basis, the relation C-T was proposed by an Arrhenius-type relation [C=A.exp(B/T)] and this function was incorporated to the original GAB model to re-estimate the parameters A, B, Mo, and K. The developed modification provides a generalised and precise expression of GAB model for Amaranth.
format Articulo
Articulo
author Pagano, A. M.
Mascheroni, Rodolfo Horacio
author_facet Pagano, A. M.
Mascheroni, Rodolfo Horacio
author_sort Pagano, A. M.
title Water Sorption of Amaranthus cruentus L. Seeds Modelled by GAB Equation
title_short Water Sorption of Amaranthus cruentus L. Seeds Modelled by GAB Equation
title_full Water Sorption of Amaranthus cruentus L. Seeds Modelled by GAB Equation
title_fullStr Water Sorption of Amaranthus cruentus L. Seeds Modelled by GAB Equation
title_full_unstemmed Water Sorption of Amaranthus cruentus L. Seeds Modelled by GAB Equation
title_sort water sorption of amaranthus cruentus l. seeds modelled by gab equation
publishDate 2003
url http://sedici.unlp.edu.ar/handle/10915/84648
work_keys_str_mv AT paganoam watersorptionofamaranthuscruentuslseedsmodelledbygabequation
AT mascheronirodolfohoracio watersorptionofamaranthuscruentuslseedsmodelledbygabequation
bdutipo_str Repositorios
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