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Comparison of the Effect of Traditional and Industrial Drying Methods in Raisins Production On Heavy Metals Concentrations

Einfluss traditioneller und industrieller Trocknungsmethoden auf die Schwermetallkonzentrationen in Rosinen

Abstract

The present study was conducted to compare the effects of traditional and industrial methods on heavy metals concentrations in raisins. The concentration of heavy metals (cadmium, lead, nickel, copper, arsenic, and zinc) were examined in various types of raisin samples include Sultana, Golden Raisins, Shade-dried and Sun-dried raisins from Malayer city of Iran. Results showed that the mean concentrations of lead, nickel, copper, arsenic, and zinc were 0.08, 4.72, 3.07, 0.17, and 2.25 mg/kg, respectively. The concentrations of arsenic, copper, and nickel in all raisin samples were higher than the limits recommended by FAO/WHO while for zinc, and lead (80.77% of samples) was lower or in the range of the permitted values by WHO/FAO, EC, and ISIRI. Also the highest concentrations of heavy metals in raisins were observed in industrial drying methods (Sultana and Golden raisins). We identified a positive correlation between zinc and nickel in raisin samples (P < 0.01), while there was no correlation between the other elements.

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Acknowledgements

This paper was extracted from a research project with the code of 84/5-1-199 that financially supported by Malayer University of Iran.

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Correspondence to Eisa Solgi.

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E. Solgi and T. Khodadadi declare that they have no competing interests.

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Solgi, E., Khodadadi, T. Comparison of the Effect of Traditional and Industrial Drying Methods in Raisins Production On Heavy Metals Concentrations. Erwerbs-Obstbau 62, 51–59 (2020). https://doi.org/10.1007/s10341-020-00496-9

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  • DOI: https://doi.org/10.1007/s10341-020-00496-9

Keywords

  • Heavy metals
  • Raisins
  • Malayer
  • Pollution
  • Traditional methods

Schlüsselwörter

  • Schwermetalle
  • Rosinen
  • Malayer
  • Umweltverschmutzung
  • Traditionelle Methoden