Biosorption Potential of the Aspergillus sp. and Insights into Secondary Metabolism in the Presence of Copper and Lead

The fungus Aspergillus sp. was isolated from copper mining rejects and cultured in a liquid culture medium (potato dextrose, PD) enriched with CuSO4.5H2O and Pb(NO3)2 in different concentrations. By flame atomic absorption spectrometry (FAAS) it was observed that fungus absorbed 86% of both copper and lead, with initial concentrations of 100, 500 and 1000 mg L-1. The additional results provided by scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffraction showed ability of the microorganism to act as a biosorbent as well as its capacity to transform the tested salts into other inorganic compounds. Chromatographic profile comparison of extracts obtained from the biotic, abiotic control and the cultivation enriched with the metals showed changes in the profile of the secondary metabolism. When the copper and lead salts were tested separately, there was an increase in the production of the compounds as function of the increase of the concentration and when associated promoted the decrease and disappearance of some substances produced by Aspergillus sp.
Source: Journal of the Brazilian Chemical Society - Category: Chemistry Source Type: research

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Probiotic strain Eurotium cristatum was isolated from Chinese Fuzhuan brick-tea and tested for its in vitro activity against aflatoxigenic Aspergillus flavus. Results indicated that E. cristatum can inhibit the radial growth of A. flavus. Furthermore, this inhibition might be caused by E. cristatum secondary metabolites. The ability of culture filtrate of strain E. cristatum against growth and aflatoxin B1 production by toxigenic A. flavus was evaluated in vitro. Meanwhile, the influence of filtrate on spore morphology of A. flavus was analyzed by scanning electron microscopy (SEM). Results demonstrated that both radial gr...
Source: Frontiers in Microbiology - Category: Microbiology Source Type: research
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Source: International Journal of Biological Macromolecules - Category: Biochemistry Authors: Tags: Int J Biol Macromol Source Type: research
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Source: Frontiers in Microbiology - Category: Microbiology Source Type: research
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Source: Bioscience, Biotechnology, and Biochemistry - Category: Biochemistry Authors: Tags: Biosci Biotechnol Biochem Source Type: research
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Source: Frontiers in Immunology - Category: Allergy & Immunology Source Type: research
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Source: Biocatalysis and Agricultural Biotechnology - Category: Biotechnology Source Type: research
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Source: Frontiers in Microbiology - Category: Microbiology Source Type: research
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Source: Respiratory Care - Category: Respiratory Medicine Authors: Tags: Semin Respir Crit Care Med Source Type: research
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Source: Seminars in Respiratory and Critical Care Medicine - Category: Respiratory Medicine Authors: Tags: Review Article Source Type: research
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Source: Molecules - Category: Chemistry Authors: Tags: Article Source Type: research
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