Extracellular production of tellurium nanoparticles by the photosynthetic bacterium Rhodobacter capsulatus

Borghese, Roberto; Brucale, Marco; Fortunato, Gianuário; Lanzi, Massimiliano; Mezzi, A.; Valle, Francesco; Cavallini, M.; Zannoni, Davide

doi:10.1016/j.jhazmat.2016.02.011

Cited by 42 publications

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“…Interestingly, a large number of Gram-negative [10–13] and Gram-positive bacteria [16–18] were reported to be tolerant and/or resistant towards tellurite. A common strategy used by microorganisms to overcome the toxicity of TeO 3 2− , relies on the reduction of this oxyanion to its less available/toxic elemental form (Te 0 ), producing either intracellular metalloid deposits or nanostructures [12].…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, due to tellurite’s use in electronics as well as industrial glasses, it can be found highly concentrated in soil and water near waste discharge sites of manufacturing and processing facilities [9], as a hazardous and toxic pollutant [6]. Despite TeO 3 2− toxicity, several Gram-negative microorganisms capable to grow phototrophycally or chemotrophycally under aerobic and anaerobic conditions have been described for their capability to reduce this toxic oxyanion, such as Rhodobacter capsulatus B100, Shewanella odeinensis MR-1, Pseudomonas pseudoalcaligenes KF707, and Escherichia coli HB101 strain [10–13]. Additionally, α-Proteobacteria resistant to concentrations of TeO 3 2− ranging from 1 to 25 mg/mL [14, 15] and a few Gram-positive strains (e.g., Bacillus beveridgei sp.nov., Bacillus selenitireducens , Corynebacterium diphtheria , Lysinibacillus sp.…”

Section: Introductionmentioning

confidence: 99%

“…Particularly, Kim and colleagues [25] showed the capability of Shewanella oneidensis MR-1 to produce tellurium nanorods (TeNRs), while Rhodobacter capsulatus B100 is able to produce both intra- and extra-cellular needle-shaped Te-nanocrystals [10]. Another example is the synthesis of tellurium nanoparticles (TeNPs) in cells of Ochrobactrum MPV-1 [26].…”

Section: Introductionmentioning

confidence: 99%

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Rhodococcus aetherivorans BCP1 as cell factory for the production of intracellular tellurium nanorods under aerobic conditions

et al. 2016

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BackgroundTellurite (TeO3 2−) is recognized as a toxic oxyanion to living organisms. However, mainly anaerobic or facultative-anaerobic microorganisms are able to tolerate and convert TeO3 2− into the less toxic and available form of elemental Tellurium (Te0), producing Te-deposits or Te-nanostructures. The use of TeO3 2−-reducing bacteria can lead to the decontamination of polluted environments and the development of “green-synthesis” methods for the production of nanomaterials. In this study, the tolerance and the consumption of TeO3 2− have been investigated, along with the production and characterization of Te-nanorods by Rhodococcus aetherivorans BCP1 grown under aerobic conditions.ResultsAerobically grown BCP1 cells showed high tolerance towards TeO3 2− with a minimal inhibitory concentration (MIC) of 2800 μg/mL (11.2 mM). TeO3 2− consumption has been evaluated exposing the BCP1 strain to either 100 or 500 μg/mL of K2TeO3 (unconditioned growth) or after re-inoculation in fresh medium with new addition of K2TeO3 (conditioned growth). A complete consumption of TeO3 2− at 100 μg/mL was observed under both growth conditions, although conditioned cells showed higher consumption rate. Unconditioned and conditioned BCP1 cells partially consumed TeO3 2− at 500 μg/mL. However, a greater TeO3 2− consumption was observed with conditioned cells. The production of intracellular, not aggregated and rod-shaped Te-nanostructures (TeNRs) was observed as a consequence of TeO3 2− reduction. Extracted TeNRs appear to be embedded in an organic surrounding material, as suggested by the chemical–physical characterization. Moreover, we observed longer TeNRs depending on either the concentration of precursor (100 or 500 μg/mL of K2TeO3) or the growth conditions (unconditioned or conditioned grown cells).Conclusions Rhodococcus aetherivorans BCP1 is able to tolerate high concentrations of TeO3 2− during its growth under aerobic conditions. Moreover, compared to unconditioned BCP1 cells, TeO3 2− conditioned cells showed a higher oxyanion consumption rate (for 100 μg/mL of K2TeO3) or to consume greater amount of TeO3 2− (for 500 μg/mL of K2TeO3). TeO3 2− consumption by BCP1 cells led to the production of intracellular and not aggregated TeNRs embedded in an organic surrounding material. The high resistance of BCP1 to TeO3 2− along with its ability to produce Te-nanostructures supports the application of this microorganism as a possible eco-friendly nanofactory.Electronic supplementary materialThe online version of this article (doi:10.1186/s12934-016-0602-8) contains supplementary material, which is available to authorized users.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Rhodococcus aetherivorans BCP1 as cell factory for the production of intracellular tellurium nanorods under aerobic conditions

et al. 2016

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“…3). Recently, Borghese et al (17) have reported that the oxyanion of tellurite transformed into needle-like black Te NPs with the size range of 200-800 nm after 10 days of anaerobic incubation in the presence of R. capsulatus. Among the 123 tellurite-resistant bacteria isolated from the extreme environment of Antarctica, six Te NPs-producing strains (i.e., Staphylococcus, Acinetobacter, and Pseudomonas genus) were obtained which displayed about 35-500 fold resistance to tellurite compared to that of the tellurium-sensitive E. coli (5).…”

Section: Production Purifi Cation and Characterization Of Te Nrsmentioning

confidence: 99%

“…Some microorganisms such as Rhodobacter capsulatus (15), Acinetobacter haemolyticus (5), and Bacillus selenitireducens (16) have excellent capability in converting metalloid ions like tellurium into nanoparticles. In fact, these tellurite-resistant microbial strains introduce these metalloid oxyanions into their respiratory chain as electron acceptors where tellurium oxyanions are reduced to the metalloid Te 0 (17). Reduction of the tellurite using nitrate reductases and other reductases present either in the periplasmic space or bound into outer membrane has been also introduced as another mechanism for the production of the elemental and insoluble form of Te which is then precipitated in the cell compartments (6,17).…”

Section: Introductionmentioning

confidence: 99%

Antimicrobial and Antioxidant Activity of the Biologically Synthesized Tellurium Nanorods; A Preliminary In vitro Study

Shakibaie

Adeli-Sardou

Mohammadi-Khorsand

et al. 2017

Iran. J. Biotechnol.

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Background: Recent theranostic (therapeutic or diagnostic) applications of tellurium nanoparticles have attracted a great interest for development of diff erent methods for synthesis of this valuable nanostructure, especially via biological resources. Objectives: In the present study, the antimicrobial and antioxidant eff ects of the tellurium nanorods (Te NRs) biosynthesized by a bacterial strain Pseudomonas pseudoalcaligenes strain Te were evaluated. Materials and Methods:The antimicrobial eff ect of Te NRs and potassium tellurite against diff erent bacterial and fungal pathogens was assessed by microdilution method. Furthermore, the disk diff usion method was used to evaluate the antibacterial eff ect of the biogenic Te NRs and potassium tellurite against methicillin-resistant Staphylococcus aureus, alone or in combination with various antibiotics. Also, the biogenic Te NRs were investigated for antioxidant activity using 2, 2-diphenyl-1-picrylhydrazyl (DPPH) scavenging activity and reducing power assay. Results: Transmission electron micrograph (TEM) of the purifi ed Te NRs showed individual and rod-shaped nanostructure (~22 nm diameter by 185 nm in length). Based on the data obtained from both microdilution and disk diff usion method the K 2 TeO 3 exhibited a higher antibacterial and antifungal activity compared to the Te NRs. The measured IC 50 for the biogenic Te NRs (i.e. DPPH radical scavenging activity) was found to be 24.9 μg.mL -1 , while, K 2 TeO 3 has represented only 17.6 ± 0.8 % DPPH radical scavenging eff ect at the concentration of 160 μg.mL -1 . The reducing power assay revealed a higher electron-donating activity for Te NRs compared to K 2 TeO 3 . Conclusions: Based on the data obtained from both microdilution and disk diff usion method the K 2 TeO 3 exhibited a higher antimicrobial and antifungal activity than Te NRs. Te NRs didn't show the antibacterial eff ect against the tested bacterial strain: MRSA and showed an inhibitory eff ect and antibacterial activity of the eff ective antibiotics. However, more studies should be performed to explore the action mechanism of the produced biogenic Te NRs.

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Microbial recovery of metallic nanoparticles from industrial wastes and their environmental applications

Pat-Espadas

Cervantes

2018

J of Chemical Tech & Biotech

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In recent years, metallic nanoparticles (NPs) have been produced by biological methods using bacteria and have been used with remarkable environmental applications. This paper emphasizes the basic aspects of microbial synthesis of metallic nanoparticles, from the selection of the strain to the settings of reaction parameters. Mechanisms involved in the microbial production of NPs are also discussed, summarizing general findings and implications in the process. There is also a section dedicated to the identification of wastes as a source of precious metals and the production of metallic NPs from waste streams containing ionic metals to give a vision of the opportunities to implement microbial synthesis as a treatment–recovery technology. Environmental applications of biogenic NPs are reviewed in detail indicating that the implementation of these nanomaterials enable the achievement of higher removal efficiencies and greater extent of transformation of recalcitrant compounds in wastewater treatment systems. Under this scenario and based on the information reviewed concluding remarks and futures perspectives are enunciated. © 2018 Society of Chemical Industry

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Extracellular production of tellurium nanoparticles by the photosynthetic bacterium Rhodobacter capsulatus

Cited by 42 publications

References 50 publications

Rhodococcus aetherivorans BCP1 as cell factory for the production of intracellular tellurium nanorods under aerobic conditions

Rhodococcus aetherivorans BCP1 as cell factory for the production of intracellular tellurium nanorods under aerobic conditions

Antimicrobial and Antioxidant Activity of the Biologically Synthesized Tellurium Nanorods; A Preliminary In vitro Study

Microbial recovery of metallic nanoparticles from industrial wastes and their environmental applications

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