Rheological and structural characterization of tomato paste and its influence on the quality of ketchup

Elena Bayod, Ene Pilman Willers, Eva Tornberg

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Three hot break tomato pastes were investigated to determine the effect of their characteristics on the properties of tomato ketchup, processed in an industrial-scale facility (i.e. diluted, heated, homogenized and cooled). Pastes and ketchups were characterized by particle size distribution, volume fraction, and rheological behavior in steady and dynamic shear. The ketchups were also subjected to sensory assessment. The processing of pastes into ketchups induced large structural changes, which were reflected in all parameters studied. The volume fraction of solids (φ) accurately reflected the changes that the paste suspensions underwent during processing and it appeared to be a good predictor of the flow behavior of both the pastes and the ketchups. The corresponding flow curves were found to be well described by the Carreau model in a large range of shear rates and concentrations. However, the rheological characteristics of the commercial pastes studied did not directly correlate to those of the corresponding ketchups. Instead, our results suggest that the change in structure induced by processing might be governed by other properties of the paste, such as the fraction of small and large particles and their sensitivity to breakage, together with the viscosity of the aqueous phase.
    Original languageEnglish
    Pages (from-to)1289-1300
    JournalLWT - Food Science and Technology
    Volume41
    Issue number7
    DOIs
    Publication statusPublished - 2008

    Bibliographical note

    Article in Press, Corrected Proof
    Available online 3 September 2007

    Subject classification (UKÄ)

    • Food Engineering

    Free keywords

    • Rheology
    • Structure
    • Tomato paste
    • Quality
    • Ketchup

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