Pectinase activity determination: An early deceleration in the release of reducing sugars throws a spanner in the works!

Alessandra Biz, Fernanda Cardoso Farias, Francine Aline Motter, Diogo Henrique de Paula, Peter Richard, Nadia Krieger, David Alexander Mitchell (Corresponding Author)

    Research output: Contribution to journalArticleScientificpeer-review

    45 Citations (Scopus)


    Recently, it has been suggested that pectinases could be used to hydrolyze pectin in biorefineries based on pectin-rich agro-industrial wastes. However, for this to be viable, the cost of their production would need to be lowered significantly. In fact, over the last few decades, there have been many attempts to improve pectinase production by existing strains or to screen for new strains from environmental isolates. In these studies, it is necessary to measure pectinase activities. Many researchers use single-time-point assays that involve incubation of pectinolytic extracts with pectic substrates for a fixed time, followed by determination of the liberated reducing sugars. However, different researchers use quite different conditions for this assay. Furthermore, no attention has been given to the reaction profile during the assay. In the current work, we show, for the first time, that a significant deceleration of the rate of liberation of reducing sugars occurs over the first ten minutes of the reaction. As a consequence, the incubation time used in a single-time-point assay has a large effect on the value obtained for the activity. In fact, we demonstrate that, depending on the particular combination of incubation time, pectin concentration and reaction temperature, the same extract could be reported to have activities that differ by an order of magnitude. In addition, we show that the relative activities obtained with polygalacturonic acid do not correlate with those obtained with pectin. We conclude that it is currently impossible to make meaningful comparisons between pectinase activities reported in the literature by workers who have used different assay conditions. Therefore there is an urgent need for the development of a standardized assay for evaluating the saccharification potential of pectinase complexes.
    Original languageEnglish
    Article numbere109529
    JournalPLoS ONE
    Issue number10
    Publication statusPublished - 2014
    MoE publication typeA1 Journal article-refereed


    • aspergillus
    • cellulases
    • deceleration
    • enzymes
    • fermentation
    • hydrolysis
    • pectins
    • reaction time


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