A model for the prediction of fermentable sugar concentrations during mashing

Tatu Koljonen, Jari Hämäläinen (Corresponding Author), Katharina Sjöholm, Kirsti Pietilä

    Research output: Contribution to journalArticleScientificpeer-review

    30 Citations (Scopus)

    Abstract

    A model describing the hydrolysis of starch catalysed by α- and β-amylase in mashing was developed. The model was included in a simulation program that helps the planning of the mashing temperature profile.
    Measurements from laboratory scale mashings with different temperature profiles were used for estimating the model parameters for a Finnish malt made from the two-row barley variety Kymppi. An estimate for the proportion of gelatinized starch at different temperatures was also obtained.
    The model predictions for glucose, maltose and maltotriose concentrations were compared with independent measurements not used in the parameter estimation. The prediction errors for the final total concentration of fermentable sugars in wort (glucose, maltose and maltotriose) were +0.6 to −5.6% (3 mashings) when Kymppi malt was mashed. For the other two malts tested on the laboratory scale the prediction errors were −1.1 to −9.9% (4 mashings) and in the industrial scale mashings +4.6 to −2.6% (7 mashings).
    The model predicted the concentrations of active α- and β-amylase to a sufficient accuracy in all experiments. Estimating the model parameters for the mashing conditions and the malt used would make the model predictions for fermentable sugar concentrations more accurate.
    Original languageEnglish
    Pages (from-to)329-350
    JournalJournal of Food Engineering
    Volume26
    Issue number3
    DOIs
    Publication statusPublished - 1995
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Maltose
    Amylases
    sugars
    Starch
    malt
    Temperature
    prediction
    Glucose
    maltotriose
    Hordeum
    maltose
    amylases
    temperature profiles
    Hydrolysis
    starch
    glucose
    program planning
    hydrolysis
    barley
    temperature

    Keywords

    • mashing

    Cite this

    Koljonen, Tatu ; Hämäläinen, Jari ; Sjöholm, Katharina ; Pietilä, Kirsti. / A model for the prediction of fermentable sugar concentrations during mashing. In: Journal of Food Engineering. 1995 ; Vol. 26, No. 3. pp. 329-350.
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    abstract = "A model describing the hydrolysis of starch catalysed by α- and β-amylase in mashing was developed. The model was included in a simulation program that helps the planning of the mashing temperature profile. Measurements from laboratory scale mashings with different temperature profiles were used for estimating the model parameters for a Finnish malt made from the two-row barley variety Kymppi. An estimate for the proportion of gelatinized starch at different temperatures was also obtained. The model predictions for glucose, maltose and maltotriose concentrations were compared with independent measurements not used in the parameter estimation. The prediction errors for the final total concentration of fermentable sugars in wort (glucose, maltose and maltotriose) were +0.6 to −5.6{\%} (3 mashings) when Kymppi malt was mashed. For the other two malts tested on the laboratory scale the prediction errors were −1.1 to −9.9{\%} (4 mashings) and in the industrial scale mashings +4.6 to −2.6{\%} (7 mashings). The model predicted the concentrations of active α- and β-amylase to a sufficient accuracy in all experiments. Estimating the model parameters for the mashing conditions and the malt used would make the model predictions for fermentable sugar concentrations more accurate.",
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    author = "Tatu Koljonen and Jari H{\"a}m{\"a}l{\"a}inen and Katharina Sj{\"o}holm and Kirsti Pietil{\"a}",
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    A model for the prediction of fermentable sugar concentrations during mashing. / Koljonen, Tatu; Hämäläinen, Jari (Corresponding Author); Sjöholm, Katharina; Pietilä, Kirsti.

    In: Journal of Food Engineering, Vol. 26, No. 3, 1995, p. 329-350.

    Research output: Contribution to journalArticleScientificpeer-review

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    AU - Hämäläinen, Jari

    AU - Sjöholm, Katharina

    AU - Pietilä, Kirsti

    N1 - Project code: A5SU00435

    PY - 1995

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    AB - A model describing the hydrolysis of starch catalysed by α- and β-amylase in mashing was developed. The model was included in a simulation program that helps the planning of the mashing temperature profile. Measurements from laboratory scale mashings with different temperature profiles were used for estimating the model parameters for a Finnish malt made from the two-row barley variety Kymppi. An estimate for the proportion of gelatinized starch at different temperatures was also obtained. The model predictions for glucose, maltose and maltotriose concentrations were compared with independent measurements not used in the parameter estimation. The prediction errors for the final total concentration of fermentable sugars in wort (glucose, maltose and maltotriose) were +0.6 to −5.6% (3 mashings) when Kymppi malt was mashed. For the other two malts tested on the laboratory scale the prediction errors were −1.1 to −9.9% (4 mashings) and in the industrial scale mashings +4.6 to −2.6% (7 mashings). The model predicted the concentrations of active α- and β-amylase to a sufficient accuracy in all experiments. Estimating the model parameters for the mashing conditions and the malt used would make the model predictions for fermentable sugar concentrations more accurate.

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