Abstract
The behavior of various filamentous fungi in the presence of metals such as Cu, Zn, Ni, Fe, Mn, and V has been widely reported. However, there is little information regarding metals such as Au, Ag and Pt that are not in the form of nanoparticles. The growth of eight filamentous fungi was evaluated at increasing doses of Au, Ag and Pt. The fungi were reactivated in Petri dishes with potato dextrose agar. Subsequently, individual mycelial disks from each strain were inoculated in PDA plates with the following doses of AuCl3, Ag2SO4 and PtCl4: 0, 50, 150 and 300 mg L−1, respectively. The plates were then incubated for 20 days—a period in which the diameter of the colony was measured every 24 h. Au showed the highest toxicity for the tested fungi. All silver doses decreased the growth of most of the fungi, while platinum did not cause any inhibitory effect on the growth of the eight tested fungi. With a simple test, it was possible to observe the effect of precious metals (PMs) on the growth of filamentous fungi and consider their possible biotechnological applications in the recovery of PMs from primary or secondary sources.
Highlights
Precious metals (PMs) are a group of elements (Au, Ag, Pt, Pd, Ir, Rh, Os and Ru) that have taken on great importance in recent years due to their diverse applications in the medical and high-technology industries; their demand and price have increased [1,2,3,4]
There are a large number of reports on the interaction presented by metals such as K, Na, Mg, Ca, Mn, Fe, Cu, Zn, Co, Ni, Al, Cd, Hg and Pb with bacteria, fungi and algae primarily [7,8,9,10,11,12,13,14,15], but the studies are limited to a great extent to the interaction with precious metals (PMs) that are in the form of nanoparticles
A. niger MX5, T. harzianum MX2 and F. oxysporum MX17 were isolated from soil contaminated with metals, and H. lixii MXPE12 and F. solani MXPE15 were taken from an electronic board, with both samples coming from the surroundings of the El Tronconal sanitary landfill, Xalapa-Veracruz, Mexico
Summary
Precious metals (PMs) are a group of elements (Au, Ag, Pt, Pd, Ir, Rh, Os and Ru) that have taken on great importance in recent years due to their diverse applications in the medical and high-technology industries; their demand and price have increased [1,2,3,4]. Considering the above-mentioned factors, it is necessary to develop new biotechnologies for the extraction/recovery of PMs from diverse materials. It was found that some bacteria play an important role in the biogeochemical cycle of Au, since microbes have been mobilizing Au for more than hundreds of years [16,17,18,19,20]. This ability has been used to generate biotechnological leaching techniques that allow
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