Authenticity of tomato products
Voldrich, M. | Kvasnicka, F. | Janetova, P. | Dobias, J. (Vysoka Skola Chemicko-technologicka, Prague (Czech Republic). (Ustav Konzervace Potravin a Technologie Masa)
The Czech food law (Decree No. 332/1997 of the law No. 110/1997) specifies the minimum tomato content in ketchup being 7 or 10 % of tomato solids in the total refractive solid content, which is 25 or 30 % for tomato ketchup and tomato ketchups labelled Prima, Extra, Special, respectively. Various analytical markers including lycopene, b-carotene, 5-pyrrolidon-2-carboxylic acid (pyroglutamic acid, PCA), glucose, fructose, sucrose, citric and malic acid, Na**+, K**+, Ca**2+, Mg**2+, formol number, etc. were evaluated. Two sets of ketchup samples were analyzed. The method for the estimation of tomato content in ketchup was proposed. In spite of the limited number of calibration samples, the procedure allows to distinguish the falsified samples with tomato content lowered of more than about 1.25 % of tomato solids.
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