The quality of ketchups from the Czech Republic's market in terms of their physico-chemical properties
DOI:
https://doi.org/10.5219/898Keywords:
tomatoes, ketchup, PCA, chemical analysis, rheologyAbstract
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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Bannwart, G. C. M., Bolini, H. M. A., Toledo, M. C., Kohn, A. P. C., Cantanhede, G. C. 2008. Evaluation of Brazilian light ketchups II: quantitative descriptive and physicochemical analysis. Cienc. Tecnol. Aliment., vol. 28, no. 1, p. 107-115. https://doi.org/10.1590/S0101-20612008000100016 DOI: https://doi.org/10.1590/S0101-20612008000100016
Bayod, E., Willers Pilman, E., Tornberg, E. 2008. Rheological and structural characterization of tomato paste and its influence on the quality of ketchup. LWT, vol. 41, no. 7, p. 1289-1300. https://dx.doi.org/10.1016/j.lwt.2007.08.011 DOI: https://doi.org/10.1016/j.lwt.2007.08.011
Burton-Freeman, B., Reimers, K. 2011. Tomato consumption and health: Emerging benefits. American Journal of Lifestyle Medicine, vol. 5, p. 182-191. https://doi.org/10.1177/1559827610387488 DOI: https://doi.org/10.1177/1559827610387488
Canene-Adams, K., Campbell, J. K., Zaripheh, S., Jeffery, E. H., Erdman, J. W. 2005. Tomato as a functional food. Journal of Nutrition, vol. 135, no. 5, p. 1226-1230. https://doi.org/10.1093/jn/135.5.1226 PMid:15867308 DOI: https://doi.org/10.1093/jn/135.5.1226
CSN EN 12145. 1997. Fruit and vegetable juices - Determination of total dry matter - Gravimetric method with weight loss on drying.
Divis, P., Porizka, J., Vespalcova, M., Matejicek, A., Kaplan, J. 2015. Elemental composition of fruits from different black elder (Sambucus nigra L.) cultivars grown in the Czech Republic. J. Elementol., vol. 20, no. 3, p. 549-557. https://doi.org/10.5601/jelem.2015.20.1.758 DOI: https://doi.org/10.5601/jelem.2015.20.1.758
Hayes, W. A., Smith, F. G., Morris, A. E. J., 1998. The production and quality of tomato concentrates. Crit. Rev. Food Sci. Nutr. vol. 38, no. 7, p. 537-564. https://doi.org/10.1080/10408699891274309 DOI: https://doi.org/10.1080/10408699891274309
Lehkoživová, J., Karovičová, J., Kohajdová, Z. 2009. The quality and authenticity markers of tomato ketchup. Acta Chimica Slovaca, vol. 2, p. 88-96.
Mendelova, A., Mendel, L., Fikselova, M., Czako, P. 2013. Effect of drying temperature on lycopene content of processed tomatoes. Potravinarstvo, vol. 7, no. 1, p. 141-145. https://doi.org/10.5219/300 DOI: https://doi.org/10.5219/300
Norton, I. T., Spyropoulos, F., Cox, P. 2011. Practical Food Rheology: An Interpretive Approach. Wiley-Blackwell, 280 p., ISBN-13: 978-1405199780. https://doi.org/10.1002/9781444391060 DOI: https://doi.org/10.1002/9781444391060
Porretta, S. 1991. Analytical profiling of ketchup. J. Sci. Food Agric., vol. 57, p. 293-301. https://doi.org/10.1002/jsfa.2740570213 DOI: https://doi.org/10.1002/jsfa.2740570213
Sharoba, A. M., Senge, B., El-Mansy, H. A., Bahlol, H., Blochwitz, R. 2005. Chemical, sensory and rheological properties of some commercial German and Egyptian tomato ketchups. Eur. Food Res. Technol., vol. 220, no. 2, p. 142-151. https://doi.org/10.1007/s00217-004-0981-7 DOI: https://doi.org/10.1007/s00217-004-0981-7
Suwanaruang, T. 2016. Analyzing lycopene content in fruit. Agriculture and Agricultural Science Procedia, vol. 11, p. 46-48. https://doi.org/10.1016/j.aaspro.2016.12.008 DOI: https://doi.org/10.1016/j.aaspro.2016.12.008
Torbica, A., Belovic, M., Mastilovic, J., Kevresan, Z., Pestoric, M., Skrobot, D., Dapcevic Hadnadev, T. 2016. Nutritional, rheological, and sensory evaluation of tomato ketchup woth increased content of natural fibres made from fresh tomato pomace. Food and Bioproducts Processing, vol. 98, p. 299-309. https://doi.org/10.1016/j.fbp.2016.02.007 DOI: https://doi.org/10.1016/j.fbp.2016.02.007
Thakur, B. R., Singh, R. K., Nelson, P. E. 1996. Quality attributes of processed tomato products: A review. Food Rev. Int., vol. 12, no. 3, p. 375-401. https://doi.org/10.1080/87559129609541085 DOI: https://doi.org/10.1080/87559129609541085
USDA, 2015. United States Department of Agriculture database. Available at: https://ndb.nal.usda.gov/
Wawrzyniak, A., Marciniak, A., Rajewska, J. 2005. Lycopene content of selected foods available on the polish market and estimation of its intake. Pol. J. Food Nutr. Sci., vol. 14/55, p. 195-200.
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