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Fresenius' Journal of Analytical Chemistry

, Volume 368, Issue 2–3, pp 281–287 | Cite as

Characterization of high molecular weight cadmium species in contaminated vegetable food

  • K. Günther
  • G. Ji
  • B. Kastenholz
Original paper

Abstract

Spinach and radish grown from seeds were each contaminated with 4 different amounts of cadmium. After a cell breakdown of the eatable parts and centrifugation of the resulting homogenates all supernatants (cytosols) were separated by gel permeation chromatography (GPC). The size-range of the GPC method used was about 20–8000 kDa for globular proteins. The high molecular weight (HMW-Cd-SP, 150–700 kDa) and the low molecular weight Cd species (LMW-Cd-SP, < 150 kDa) in all plant cytosols eluted at about the same retention volume by GPC. The most important Cd binding form in the cytosols of all plants was found to be HMW-Cd-SP. The Cd elution maxima were detected in the range of about 200 kDa. The Cd determinations were performed with ET-AAS by means of matrix modifier. By incubating chosen cytosols with a proteinase before the GPC it was verified that the HMW-Cd-SP in both vegetables are Cd proteins. The molar proportions protein/Cd were about 2–6 in the respective GPC fractions of the HMW-Cd-SP of the highest contaminated plants. The GPC fractions of the HMW-Cd-SP of spinach and radish were further separated by a preparative, native and continuous polyacrylamide gel electrophoresis (PAGE) method. At pH 8 the species were negatively charged, had only a small UV-absorption at 280 nm and showed a very similar elution behavior in all analyzed cytosols. Therefore, we suppose that the HMW-Cd-SP of these two different vegetable foodstuffs have a very similar chemical structure.

Keywords

Cytosol Retention Volume Similar Chemical Structure Vegetable Food Elution Behavior 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • K. Günther
    • 1
  • G. Ji
    • 2
  • B. Kastenholz
    • 1
  1. 1.Institut für Angewandte Physikalische Chemie, Forschungszentrum Jülich GmbH, 52425 Jülich, GermanyDE
  2. 2.Institut für Lebensmittelwissenschaft und Lebensmittelchemie der Universität Bonn, Endenicher Allee 11–13, 53115 Bonn, GermanyDE

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