Five bacterial strains identified in soil samples collected at three dismissed industrial sites contaminated by heavy metals and metalloids such as lead, arsenic, and selenium were analysed for their capability to reduce the toxic oxyanion selenite (SeO32-) to the non-toxic zerovalent selenium. All isolates resulted taxonomically related to the Stenotrophomonas maltophilia species and capable of forming Senanopaticles (SeNPs). The strains labelled as A16, AW, B, T, and SeITE02 were obtained by means of enrichment cultures added with organic lead (A16), arsenite (AW, B, T), and selenite (SeITE02) respectively. Each isolate was investigated for the degree of resistance to selenite, the rate of selenite reduction to elemental selenium, as well as the formation of SeNPs and their localization within the bacterial cell.
Bacterial biosynthesis of selenium nanoparticles by environmental isolates of Stenotrophomonas maltophilia
LAMPIS, Silvia;Zonaro, Emanuele;SANTI, Chiara;VALLINI, Giovanni
2012-01-01
Abstract
Five bacterial strains identified in soil samples collected at three dismissed industrial sites contaminated by heavy metals and metalloids such as lead, arsenic, and selenium were analysed for their capability to reduce the toxic oxyanion selenite (SeO32-) to the non-toxic zerovalent selenium. All isolates resulted taxonomically related to the Stenotrophomonas maltophilia species and capable of forming Senanopaticles (SeNPs). The strains labelled as A16, AW, B, T, and SeITE02 were obtained by means of enrichment cultures added with organic lead (A16), arsenite (AW, B, T), and selenite (SeITE02) respectively. Each isolate was investigated for the degree of resistance to selenite, the rate of selenite reduction to elemental selenium, as well as the formation of SeNPs and their localization within the bacterial cell.
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