The quality of ketchups from the Czech Republic's market in terms of their physico-chemical properties

Authors

  • Pavel Diviš University of Technology, Faculty of Chemistry, Department of Food chemistry and Biotechnology & Materials research centre, Purkyňova 118, 612 00 Brno
  • Jiří­ Smilek Brno University of Technology, Faculty of Chemistry, Materials research centre, Purkyňova 118, 612 00 Brno
  • Jaromí­r Poří­zka Brno University of Technology, Faculty of Chemistry, Department of Food chemistry and Biotechnology & Materials research centre, Purkyňova 118, 612 00 Brno
  • Václav Štursa Brno University of Technology, Faculty of Chemistry, Department of Food chemistry and Biotechnology, Purkyňova 118, 612 00 Brno

DOI:

https://doi.org/10.5219/898

Keywords:

tomatoes, ketchup, PCA, chemical analysis, rheology

Abstract

Ketchup is a tomato-based condiment with a tang contributed by vinegar, sugar, salt and spices. Physical and chemical quality requirements for ketchup are regulated in the Czech Republic by Decree No. 157/2003 as amended. The main monitored parameters determining the quality of ketchups are total tomato content, total soluble solids, total organic acids and total salt content. In this work the following parameters were monitored in a total of eight ketchups from the commercial markets in the Czech Republic: pH, total solids, total soluble solids, citric acid content, acetic acid content, lycopene content, fructose, glucose and sucrose content and content of Ca, K, Mg and Na. In addition to chemical analyses, rheological measurements were performed and dynamic viscosity and yield stress were determined. The results obtained were statistically processed and the hypothesis i) whether the sales price of ketchups is related to the quality of ketchups expressed in chemical composition and ii) whether the chemical composition affects the rheological properties of ketchups has been verified. The Pearson correlation matrix showed very good correlation between the total solids and tomato content in the ketchup (R = 0.8464) as well as between the total soluble solids and tomato content in the ketchup (R = 0.8583). Another significant correlation was found between total soluble solids and total saccharides content in ketchup (R = 0.7309) as well as between potassium content and and tomato content in the ketchup (R = 0.8864). The chemical composition of ketchups did not significantly affect the dynamic viscosity of ketchups, however strong correlation between tomato content in ketchup and between yield stresses was found (R = 0.8436). No correlation was found between the ketchup price and chemical composition of ketchup, however cheaper ketchups contained more salt.

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References

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Published

2018-03-05

How to Cite

Diviš, P. ., Smilek, J. ., Poří­zka, J. ., & Štursa, V. . (2018). The quality of ketchups from the Czech Republic’s market in terms of their physico-chemical properties. Potravinarstvo Slovak Journal of Food Sciences, 12(1), 233–240. https://doi.org/10.5219/898

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