Total Iron and Heme Iron Content and their Distribution in Beef Meat and Viscera

Abstract

To determine the content of total iron (TFe) and heme iron (HeFe) in major cuts of meat and principal viscera of bovine origin. 55Fe (30 mCi) was injected into two 4-month-old calves. Triplicate samples of the 12 basic American cuts of meat and major viscera were obtained from each specimen. Samples were acid digested and their iron content was read by atomic absorption spectrophotometry. Duplicate samples of the basic cuts of meat and major viscera were analyzed to determine the concentration of 55Fe using a double isotopic technique. The mean and standard deviation of TFe for all cuts was 1.4 ± 0.3 mg/100 g of meat. The mean TFe for organs was (per mg/100 g): 0.9 ± 0.1 brain, 3.0 ± 0.05 kidney, 3.2 ± 0.04 heart, 5.7 ± 0.2 lung, 6.0 ± 0.1 liver, and 31.2 ± 0.4 spleen. HeFe was 64% of TFe in meat and 72.8% in spleen, 53.8% in lung, 35.7% in brain, 35.0% in kidney, 27.3% in heart, and only 13.6% in liver. Blood contained 85.5% of the radioisotope and only 1.4% was found in muscle and 1.6% was found in viscera. Results suggest that bovine cuts of meat have a low variation in TFe and that HeFe comprises more than 60% of TFe.

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Fig. 1

Abbreviations

TFe:

Total iron

HeFe:

Heme iron

nHeFe:

Non-heme iron

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Acknowledgements

CV, MO, MSM, and FP conceptualized and designed the study; CV and FP collected and analyzed the data; CV, DLdR, MO, MSM, and FP interpreted the data; CV, DLdR, and FP drafted and revised the manuscript. The author gratefully acknowledges the technical assistance of Maria Angelica Letelier. This work was supported by Fondo Nacional de Desarrollo Científico y Tecnologico (Fondecyt) No. 1061060. All authors approved the final version of the manuscript. All authors declare no general, financial, or institutional competing interests.

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Correspondence to Fernando Pizarro.

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Valenzuela, C., López de Romaña, D., Olivares, M. et al. Total Iron and Heme Iron Content and their Distribution in Beef Meat and Viscera. Biol Trace Elem Res 132, 103–111 (2009). https://doi.org/10.1007/s12011-009-8400-3

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Keywords

  • Iron
  • Heme iron
  • Meat
  • Viscera
  • Radioisotopes