Biological Trace Element Research

, Volume 189, Issue 1, pp 277–290 | Cite as

Heavy Metal Levels and Mineral Nutrient Status of Natural Walnut (Juglans regia L.) Populations in Kyrgyzstan: Nutritional Values of Kernels

  • Ibrahim Ilker OzyigitEmail author
  • Mehmet Emin Uras
  • Ibrahim Ertugrul Yalcin
  • Zeki Severoglu
  • Goksel Demir
  • Bakyt Borkoev
  • Kalipa Salieva
  • Sevil Yucel
  • Umran Erturk
  • Ali Osman Solak


In this study, mineral nutrient and heavy metal (Al, Ca, Cd, Cu, Fe, K, Mg, Mn, Na, Ni, Pb, and Zn) contents of the walnut kernels and their co-located soil samples collected from the four different zones of natural walnut forests (Sary-Chelek, Arslanbap, and Kara-Alma in Jalal-Abad Region and Kara-Shoro in Osh Region) in Kyrgyzstan were investigated. The highest concentrations for all elements determined in the soil samples were observed in the Sary-Chelek zone whereas the Arslanbap zone was found to be having the lowest concentrations except Fe and Zn. The highest concentrations in the kernels of walnut samples were found to be in the Sary-Chelek zone for Ca, Fe, K, Mg, and Zn; in the Kara-Shoro zone for Cu; in the Arslanbap zone for Mn; and in the Kara-Alma zone for Na whereas the lowest concentrations were found to be in the Arslanbap zone for Ca, Fe, K, Mg, Na, and Zn and in the Sary-Chelek zone for Cu and Mn, respectively. Also, the levels of Al, Cd, Ni, and Pb in kernel samples could not be detected by ICP-OES because their levels were lower than the threshold detection point (10 μ−1). Additionally, our data indicated that the walnut kernels from Kyrgyzstan have higher values for RDA (recommended daily allowances) in comparison with the walnut kernels from other countries.


Nut RDA value Kernel Traditional medicine Phytochemicals Walnut forest 



This work was supported by Kyrgyz-Turkish Manas University, Grant number BAP-2013-FEB-02.


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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Ibrahim Ilker Ozyigit
    • 1
    • 2
    Email author
  • Mehmet Emin Uras
    • 1
  • Ibrahim Ertugrul Yalcin
    • 3
  • Zeki Severoglu
    • 1
  • Goksel Demir
    • 4
  • Bakyt Borkoev
    • 5
  • Kalipa Salieva
    • 5
  • Sevil Yucel
    • 6
  • Umran Erturk
    • 7
  • Ali Osman Solak
    • 5
  1. 1.Department of Biology, Faculty of Science and ArtsMarmara UniversityIstanbulTurkey
  2. 2.Department of Biology, Faculty of ScienceKyrgyz-Turkish Manas UniversityBishkekKyrgyzstan
  3. 3.Department of Molecular Biology and Genetics, Faculty of Engineering and Natural SciencesBahcesehir UniversityIstanbulTurkey
  4. 4.Department of Urban and Regional Planning, Faculty of ArchitectureKirklareli UniversityKirklareliTurkey
  5. 5.Department of Chemical Engineering, Faculty of EngineeringKyrgyz-Turkish Manas UniversityBishkekKyrgyzstan
  6. 6.Department of Bioengineering, Faculty of Chemical and Metallurgical EngineeringYildiz Technical UniversityIstanbulTurkey
  7. 7.Department of Horticulture, Faculty of AgricultureUludag UniversityBursaTurkey

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