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

    39 Citations (Scopus)


    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
    Issue number3
    Publication statusPublished - 1995
    MoE publication typeA1 Journal article-refereed


    • mashing


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