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01-04-2014 | Research Paper | Issue 4/2014

Journal of Nanoparticle Research 4/2014

Time-dependent growth of crystalline Au0-nanoparticles in cyanobacteria as self-reproducing bioreactors: 1. Anabaena sp.

Journal:
Journal of Nanoparticle Research > Issue 4/2014
Authors:
Liz M. Rösken, Susanne Körsten, Christian B. Fischer, Andreas Schönleber, Sander van Smaalen, Stefan Geimer, Stefan Wehner
Important notes

Electronic supplementary material

The online version of this article (doi:10.​1007/​s11051-014-2370-x) contains supplementary material, which is available to authorized users.

Abstract

Customized metal nanoparticles are highly relevant in industrial processes, where they are used as catalysts and therefore needed on a large scale. An extremely economically and environmentally friendly way to produce metal nanoparticles is microbial biosynthesis, meaning the biosorption and bioreduction of diluted metal ions to zero valent (metal) nanoparticles. To maintain the key advantage of biosynthesis, including eco friendliness, a bioreactor (e.g., bacteria) has to be harmless by itself. Here, the ability of the cyanobacteria Anabaena sp. (SAG 12.82) is shown to fulfill both needs: bioreduction of Au3+ ions to Au0 and the subsequent formation of crystalline Au0-nanoparticles as well as absence of the release of toxic substances (e.g., anatoxin-a). The time-dependent growth of the nanoparticles is recorded by X-ray powder diffraction (XRD) and transmission electron microscopy (TEM) over a range of several days. Formation of nanoparticles starts within the first minutes at the heterocyst polysaccharide layer (HEP). After 4 h, the dominating amount of nanoparticles is found in the vegetative cells. The bioproduced nanoparticles are found in both cell types, mainly located along the thylakoid membranes of the vegetative cells and have a final average size of 9 nm within the examined timescale of a few days.

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Supplementary Material
Electronic supplementary material is available online from Springer. (DOC 3284 kb)
11051_2014_2370_MOESM1_ESM.doc
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