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Biological synthesis of fluorescent nanoparticles by cadmium and tellurite resistant Antarctic bacteria: exploring novel natural nanofactories

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dc.contributor.author Plaza, D. O.
dc.contributor.author Gallardo, C.
dc.contributor.author Straub, Y. D.
dc.contributor.author Bravo, D.
dc.contributor.author Pérez‑Donoso, J. M.
dc.date.accessioned 2016-06-21T19:09:09Z
dc.date.available 2016-06-21T19:09:09Z
dc.date.issued 2016
dc.identifier.citation Microb Cell Fact (2016) 15:76 es
dc.identifier.issn 1475-2859
dc.identifier.other DOI 10.1186/s12934-016-0477-8
dc.identifier.uri http://repositorio.unab.cl/xmlui/handle/ria/830
dc.description Indexación: Web of Science es
dc.description.abstract Background: Fluorescent nanoparticles or quantum dots (QDs) have been intensely studied for basic and applied research due to their unique size-dependent properties. There is an increasing interest in developing ecofriendly methods to synthesize these nanoparticles since they improve biocompatibility and avoid the generation of toxic byproducts. The use of biological systems, particularly prokaryotes, has emerged as a promising alternative. Recent studies indicate that QDs biosynthesis is related to factors such as cellular redox status and antioxidant defenses. Based on this, the mixture of extreme conditions of Antarctica would allow the development of natural QDs producing bacteria. Results: In this study we isolated and characterized cadmium and tellurite resistant Antarctic bacteria capable of synthesizing CdS and CdTe QDs when exposed to these oxidizing heavy metals. A time dependent change in fluorescence emission color, moving from green to red, was determined on bacterial cells exposed to metals. Biosynthesis was observed in cells grown at different temperatures and high metal concentrations. Electron microscopy analysis of treated cells revealed nanometric electron-dense elements and structures resembling membrane vesicles mostly associated to periplasmic space. Purified biosynthesized QDs displayed broad absorption and emission spectra characteristic of biogenic Cd nanoparticles. Conclusions: Our work presents a novel and simple biological approach to produce QDs at room temperature by using heavy metal resistant Antarctic bacteria, highlighting the unique properties of these microorganisms as potent natural producers of nano-scale materials and promising candidates for bioremediation purposes. es
dc.description.uri http://microbialcellfactories.biomedcentral.com/articles/10.1186/s12934-016-0477-8
dc.language.iso en es
dc.publisher BIOMED CENTRAL es
dc.subject Fluorescent nanoparticles es
dc.subject Quantum dots es
dc.subject Green synthesis es
dc.subject Antarctica es
dc.subject Bacteria es
dc.subject Heavy metals es
dc.subject MEMBRANE-VESICLES es
dc.subject ESCHERICHIA-COLI es
dc.subject OXIDATIVE STRESS es
dc.subject POTASSIUM TELLURITE es
dc.subject OPTICAL-PROPERTIES es
dc.subject LOW-TEMPERATURE es
dc.subject BIOSYNTHESIS es
dc.subject GLUTATHIONE es
dc.title Biological synthesis of fluorescent nanoparticles by cadmium and tellurite resistant Antarctic bacteria: exploring novel natural nanofactories es
dc.type Article es


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