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Air-drying and rehydration characteristics of the brown seaweeds, Ascophylum nodosum and Undaria pinnatifida

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Abstract

The water sorption isotherms (from 5 to 65 °C) and air-drying kinetics (from 35 to 75 °C) of the brown seaweeds, Ascophylum nodosum and Undaria pinnatifida (UNP), were determined. Rehydration kinetics of dried seaweeds at different temperatures were obtained at room temperature. The Caurie model was successfully applied to the experimental water adsorption and desorption data. Air-drying kinetics of both seaweeds were satisfactorily modelled using the Page model. The critical moisture contents (dry basis), 1.3 ± 0.2 for A. nodosum and 5.0 ± 0.4 for UNP, were invariant from 35 to 75 °C. Heat and mass transfer coefficients during constant drying rate period and effective coefficients of water diffusion during falling drying rate period were calculated, assuming cylinder geometry for A. nodosum and plane-sheet geometry for UNP, considering volumetric shrinkage in both cases. The Peleg model was employed for rehydration kinetic modelling at 25 °C employing dried seaweeds at 35 and 75 °C. A. nodosum showed adequate rehydration properties recovering its colour and final moisture content after drying at low temperature (35 °C).

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Acknowledgements

This paper is dedicated to Professor Francisco Chenlo, great colleague and brilliant scientist, on the occasion of his 70th birthday.

Funding

The authors acknowledge the financial support of the Spanish Ministry of Economy and Competitiveness and the European Regional Development Fund (ERDF) of the European Union through the research project CTQ 2013-43616/P.

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Authors and Affiliations

  1. Department of Chemical Engineering, Universidade de Santiago de Compostela, rúa Lope Gómez de Marzoa, 15782, Santiago, Spain

    Francisco Chenlo, Santiago Arufe, Diego Díaz, María D. Torres, Jorge Sineiro & Ramón Moreira

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  1. Francisco Chenlo
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  2. Santiago Arufe
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  3. Diego Díaz
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  4. María D. Torres
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  5. Jorge Sineiro
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  6. Ramón Moreira
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Correspondence to Ramón Moreira.

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Chenlo, F., Arufe, S., Díaz, D. et al. Air-drying and rehydration characteristics of the brown seaweeds, Ascophylum nodosum and Undaria pinnatifida . J Appl Phycol 30, 1259–1270 (2018). https://doi.org/10.1007/s10811-017-1300-6

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  • DOI: https://doi.org/10.1007/s10811-017-1300-6

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