The wide anthropogenic use of selenium compounds represents the major source of selenium pollution world- wide, causing environmental issues and health concerns. Microbe-based strategies for metal removal/recovery have received increasing interest thanks to the association of the microbial ability to detoxify toxic metal/ metalloid polluted environments with the production of nanomaterials. This study investigates the tolerance and the bioconversion of selenite (SeO32−) by the aerobically grown Actinomycete Rhodococcus aetherivorans BCP1 in association with its ability to produce selenium nanoparticles and nanorods (SeNPs and SeNRs). The BCP1 strain showed high tolerance towards SeO32− with a Minimal Inhibitory Concentration (MIC) of 500 mM. The bio- conversion of SeO32− was evaluated considering two different physiological states of the BCP1 strain, i.e. un- conditioned and/or conditioned cells, which correspond to cells exposed for the first time or after re-inoculation in fresh medium to either 0.5 or 2 mM of Na2SeO3, respectively. SeO32− bioconversion was higher for conditioned grown cells compared to the unconditioned ones. Selenium nanostructures appeared polydisperse and not ag- gregated, as detected by electron microscopy, being embedded in an organic coating likely responsible for their stability, as suggested by the physical-chemical characterization. The production of smaller and/or larger SeNPs was influenced by the initial concentration of provided precursor, which resulted in the growth of longer and/or shorter SeNRs, respectively. The strong ability to tolerate high SeO32− concentrations coupled with SeNP and SeNR biosynthesis highlights promising new applications of Rhodococcus aetherivorans BCP1 as cell factory to produce stable Se-nanostructures, whose suitability might be exploited for biotechnology purposes.

Biosynthesis of selenium-nanoparticles and –nanorods as a product of selenite bioconversion by the aerobic bacterium Rhodococcus aetherivorans BCP1 / Presentato, Alessandro; Piacenza, Elena; Anikovskiy, Max; Cappelletti, Martina; Zannoni, Davide; Turner, RAYMOND JOSEPH. - In: NEW BIOTECHNOLOGY. - ISSN 1871-6784. - ELETTRONICO. - 41:(2018), pp. 1-8. [10.1016/j.nbt.2017.11.002]

Biosynthesis of selenium-nanoparticles and –nanorods as a product of selenite bioconversion by the aerobic bacterium Rhodococcus aetherivorans BCP1

Presentato, Alessandro
;
Cappelletti, Martina;Zannoni, Davide;Turner, Raymond J.
2018

Abstract

The wide anthropogenic use of selenium compounds represents the major source of selenium pollution world- wide, causing environmental issues and health concerns. Microbe-based strategies for metal removal/recovery have received increasing interest thanks to the association of the microbial ability to detoxify toxic metal/ metalloid polluted environments with the production of nanomaterials. This study investigates the tolerance and the bioconversion of selenite (SeO32−) by the aerobically grown Actinomycete Rhodococcus aetherivorans BCP1 in association with its ability to produce selenium nanoparticles and nanorods (SeNPs and SeNRs). The BCP1 strain showed high tolerance towards SeO32− with a Minimal Inhibitory Concentration (MIC) of 500 mM. The bio- conversion of SeO32− was evaluated considering two different physiological states of the BCP1 strain, i.e. un- conditioned and/or conditioned cells, which correspond to cells exposed for the first time or after re-inoculation in fresh medium to either 0.5 or 2 mM of Na2SeO3, respectively. SeO32− bioconversion was higher for conditioned grown cells compared to the unconditioned ones. Selenium nanostructures appeared polydisperse and not ag- gregated, as detected by electron microscopy, being embedded in an organic coating likely responsible for their stability, as suggested by the physical-chemical characterization. The production of smaller and/or larger SeNPs was influenced by the initial concentration of provided precursor, which resulted in the growth of longer and/or shorter SeNRs, respectively. The strong ability to tolerate high SeO32− concentrations coupled with SeNP and SeNR biosynthesis highlights promising new applications of Rhodococcus aetherivorans BCP1 as cell factory to produce stable Se-nanostructures, whose suitability might be exploited for biotechnology purposes.
2018
Biosynthesis of selenium-nanoparticles and –nanorods as a product of selenite bioconversion by the aerobic bacterium Rhodococcus aetherivorans BCP1 / Presentato, Alessandro; Piacenza, Elena; Anikovskiy, Max; Cappelletti, Martina; Zannoni, Davide; Turner, RAYMOND JOSEPH. - In: NEW BIOTECHNOLOGY. - ISSN 1871-6784. - ELETTRONICO. - 41:(2018), pp. 1-8. [10.1016/j.nbt.2017.11.002]
Presentato, Alessandro; Piacenza, Elena; Anikovskiy, Max; Cappelletti, Martina; Zannoni, Davide; Turner, RAYMOND JOSEPH
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/611618
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