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Mineral Composition of Elements in Walnuts and Walnut Oils

Author

Listed:
  • Iva Juranović Cindrić

    (Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia)

  • Michaela Zeiner

    (Man-Environment-Technology Research Centre, School of Science and Technology, Örebro University, Gymnastikgatan 1, 70182 Örebro, Sweden
    Division of Analytical Chemistry, Department of Chemistry, BOKU—University of Natural Resources and Life Sciences, Muthgasse 18, 1190 Vienna, Austria)

  • Dora Hlebec

    (Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia)

Abstract

Walnuts ( Juglans nigra ) are considered to be a functional food. In the present study, twenty one macro-, micro-, and trace elements (Al, As, B, Ba, Ca, Cd, Co, Cr, Cu, Fe, K, Li, Mg, Mn, Mo, Na, Ni, Pb, Se, Sr, and Zn) were selected to be determined in walnuts and walnut oils. The beneficial content of essential elements could be shown by the obtained results, the macro-elements Ca, K, Mg, and Na being present in nuts with 1062 mg/kg, 2771 mg/kg, 1426 mg/kg, and 42.3 mg/kg, respectively. Regarding micro- and trace elements, the following order (decreasing content) was found: Mn > Fe > Zn > B, Mo > Cu > Ni > Co > Al > Sr > Ba > Li > Pb > Se > Cr > As > Cd. Furthermore, the potentially toxic trace elements (As, Cd, Pb) determined were below the maximum allowed values in most of the investigated walnut samples. A comparison of oils and nuts revealed that the former contain lower concentrations of all elements analyzed except for Fe and Zn. This suggested the origin from contamination during oil processing. Fe influences the oil oxidation rate, thus its entry during production should be avoided.

Suggested Citation

  • Iva Juranović Cindrić & Michaela Zeiner & Dora Hlebec, 2018. "Mineral Composition of Elements in Walnuts and Walnut Oils," IJERPH, MDPI, vol. 15(12), pages 1-9, November.
    • Handle: RePEc:gam:jijerp:v:15:y:2018:i:12:p:2674-:d:186000
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    Cited by:

    1. Agnieszka Gruszecka-Kosowska, 2019. "Human Health Risk Assessment and Potentially Harmful Element Contents in the Fruits Cultivated in the Southern Poland," IJERPH, MDPI, vol. 16(24), pages 1-24, December.

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