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    Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10259/6480

    Título
    Pressurized hot water-assisted recovery of crude residual agar from a never-dried algae industry waste stream: A Box-Behnken design approach
    Autor
    Diop, Cherif Ibrahima KhalilUBU authority Orcid
    Trigueros Andrés, EsterUBU authority Orcid
    Sanz Díez, Mª TeresaUBU authority Orcid
    Beltrán Calvo, SagrarioUBU authority Orcid
    García Tojal, JavierUBU authority Orcid
    Publicado en
    Food Hydrocolloids. 2022, V. 129, 107664
    Editorial
    Elsevier
    Fecha de publicación
    2022-08
    ISSN
    0268-005X
    DOI
    10.1016/j.foodhyd.2022.107664
    Abstract
    The potential of using pressurized hot water extraction to valorize the remaining crude agar in Gelidium sesquipedale waste stream after an initial industrial extraction was investigated. In this process, a four-factor Box-Behnken design was coupled with a response surface methodology. The impact of the operating temperature (°C), the internal pressure (bar), the extraction time (min), and the algae concentration (% w: v), as well as their quadratic effects and two-way interactions, on the physicochemical properties of the residual agar, was analyzed. The yield (%), gel strength (g/cm2), gelling temperature (°C), melting temperature (°C), 3,6-anhydrogalactose content (%), and the sulfate content (%) were all considered in the evaluation. A multiple regression statistical model was used to fit all the experimental responses to a second-order polynomial equation that confirmed the suitability of the approach. Temperature of 120 °C, low pressure of 3.28 bar, and an extended extraction time of 150 min along with a 3% (w: v) algae concentration were projected to be optimum conditions for a high extraction yield of 17.03%. The strength of the recovered agar hydrogel oscillated between a minimum of 25 g/cm2 and a maximum of 350 g/cm2. The key parameters impacting the fluctuation of the sulfate content in the recovered agar (2% ≤ sulfate content ≤10%, with R2 = 79.8%) appeared to be the temperature and the algae concentration, in addition to the quadratic effect of the solid concentration. By adjusting the parameters, the process can accommodate the physicochemical properties of agar for wider range of applications.
    Palabras clave
    Residual crude agar valorization
    Pressurized hot water extraction
    Never-dried algae industry waste stream
    Physicochemical properties
    Response surface methodology
    Box-Behnken design
    Materia
    Ingeniería química
    Chemical engineering
    Alimentos
    Food
    URI
    http://hdl.handle.net/10259/6480
    Versión del editor
    https://doi.org/10.1016/j.foodhyd.2022.107664
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    Attribution-NonCommercial-NoDerivatives 4.0 Internacional
    Documento(s) sujeto(s) a una licencia Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 Internacional
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