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Iron Bioaccumulation in Mycelium of Pleurotus ostreatus

Summary

This research explored how oyster mushroom mycelium can concentrate iron from its growing environment. The findings show that mushroom tissue can accumulate significant amounts of iron – up to 20 times more than what’s available in their food source. This discovery has important implications for developing new iron-rich food sources that aren’t from animals. Impacts on everyday life: • Could provide a new vegetarian source of dietary iron • May help address worldwide iron deficiency, especially in developing countries • Offers potential for creating iron-enriched functional foods • Demonstrates a natural way to concentrate nutrients in food • Could lead to more sustainable iron supplementation methods

Background

Pleurotus ostreatus is a basidiomycete with high nutritional, sensorial and functional value that can bioaccumulate metals in its structures. While metal bioaccumulation has been described for several ions in Pleurotus genus, there are no reports on iron bioaccumulation for this species. Iron deficiency affects over two billion people worldwide, particularly young children and women in developing countries, making iron bioaccumulation research valuable for potential functional food development.

Objective

To evaluate cultivation variables that affect iron bioaccumulation in P. ostreatus mycelium, including nitrogen and carbon sources, pH and iron concentration in the solid culture medium.

Results

Maximum mycelial biomass production was achieved with yeast extract at 2.96 g nitrogen/L and glucose at 28.45 g/L. Iron concentration was the most significant variable for bioaccumulation, with concentrations above 175 mg/L strongly inhibiting mycelial growth. The highest iron concentration in mycelium was 3500 mg/kg, produced with 300 mg/L iron addition. Optimal iron bioaccumulation occurred with 150 mg/L iron in the culture medium.

Conclusion

P. ostreatus mycelium can effectively bioaccumulate iron, concentrating up to 20 times the iron available in the culture medium. The mycelium accumulated at least five times more iron than typical basidiocarps, suggesting potential use as a non-animal iron source in functional foods.
  • Published in:Brazilian Journal of Microbiology,
  • Study Type:Laboratory Research,
  • Source: 10.1590/S1517-838246120130695
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