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Moisture Adsorption and Thermodynamic Properties of California Grown Almonds (Varieties: Nonpareil and Monterey)

Li Zuo Taitano ,
Li Zuo Taitano

Department of Biological and Agricultural Engineering, University of California, Davis , Davis , United States

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Paul Singh
Paul Singh
Contact Paul Singh

Department of Biological and Agricultural Engineering, University of California, Davis , Davis , United States

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Published: 18.04.2012.

Volume 1, Issue 1 (2012)

pp. 61-75;

https://doi.org/10.7455/ijfs/1.1.2012.a7

Abstract

Moisture adsorption characteristics of California grown almonds (Nonpareil: pasteurized and unpasteurized almonds; Monterey: pasteurized, unpasteurized and blanched almonds) were obtained using the gravimetric method over a range of water activities from 0.11 to 0.98 at 7-50ºC. The weights of almonds were measured until samples reached a constant weight. The relationship between equilibrium moisture content and water activity was established using the Guggenheim-Anderson-de Boer model. The diffusion coefficient of water in almond kernels was calculated based on Ficks second law. The monolayer moisture value of almonds ranged from 0.020 to 0.035 kg H2O kg-1 solids. The diffusion coefficient increased with temperature at a constant water activity, and decreased with water activity at a constant temperature. The thermodynamic properties (net isosteric heat, differential enthalpy and entropy) were also determined. The net isosteric heat of adsorption decreased with the increasing moisture content, and the plot of differential enthalpy versus entropy satisfied the enthalpy-entropy compensation theory. The adsorption process of almond samples was enthalpy driven over the range of studied moisture contents.

Keywords

Sorption properties,

water uptake,

storage,

almonds

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