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Enhancement of emulsifier production by Curvularia lunata in cadmium, zinc and lead presence

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Abstract

The influence of cadmium, zinc and lead on fungal emulsifier synthesis and on the growth of filamentous fungus Curvularia lunata has been studied. Tolerance to heavy metals established for C. lunata was additionally compared with the sensitivity exhibited by strains of Curvularia tuberculata and Paecilomyces marquandii—fungi which do not secrete compounds of emulsifying activity. Although C. lunata, as the only one out of all studied fungi, exhibited the lowest tolerance to heavy metals when grown on a solid medium (in conditions preventing emulsifier synthesis), it manifested the highest tolerance in liquid culture - in conditions allowing exopolymer production. Cadmium, zinc and lead presented in liquid medium up to a concentration of 15 mM had no negative effect on C. lunata growth and stimulated emulsifier synthesis. In the presence of 15 mM of heavy metals, both the emulsifier and 24-h-old growing mycelium exhibited maximum sorption capacities, which were determined as 18.2 ± 2.67, 156.1 ± 10.32 mg g−1 for Cd2+, 22.2 ± 3.40, 95.2 ± 14.21 mg g−1 for Zn2+ and 51.1 ± 1.85, 230.0 ± 28.47 mg g−1 for Pb2+ respectively. The results obtained by us in this work indicate that the emulsifier acts as a protective compound increasing the ability of C. lunata to survive in heavy metal polluted environment. Enhancement of exopolymer synthesis in the presence of Cd2+, Zn2+ and Pb2+ may also suggest, at least to some extent, a metal-specific nature of emulsifier production in C. lunata. Due to accumulation capability and tolerance to heavy metals, C. lunata mycelium surrounded by the emulsifier could be applied for toxic metal removal.

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Acknowledgement

This study was supported by the University of Lodz, grant (No. 505/390)

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Authors and Affiliations

  1. Department of Industrial Microbiology and Biotechnology, University of Łódź, Banacha 12/16, PL-90237, Lodz, Poland

    Katarzyna Paraszkiewicz, Aleksandra Frycie, Mirosława Słaba & Jerzy Długoński

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  1. Katarzyna Paraszkiewicz
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  2. Aleksandra Frycie
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  3. Mirosława Słaba
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  4. Jerzy Długoński
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Correspondence to Jerzy Długoński.

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Paraszkiewicz, K., Frycie, A., Słaba, M. et al. Enhancement of emulsifier production by Curvularia lunata in cadmium, zinc and lead presence. Biometals 20, 797–805 (2007). https://doi.org/10.1007/s10534-006-9043-x

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  • DOI: https://doi.org/10.1007/s10534-006-9043-x

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