@misc{10481/86208,
year = {2023},
url = {https://hdl.handle.net/10481/86208},
abstract = {Nowadays, metal pollution due to the huge release of toxic elements to the environment has become one of the world’s biggest problems. Bioremediation is a promising tool for reducing the mobility and toxicity of these contaminants (e.g. selenium), being an efficient, environmentally friendly, and inexpensive strategy. The present study describes the capacity of Stenotrophomonas bentonitica to biotransform SeVI through enzymatic reduction and  volatilization processes. HAADF-STEM analysis showed the bacterium to effectively reduce  SeVI (200 mM) into intra- and extracellular crystalline Se0 nanorods, made mainly of two  different Se allotropes: monoclinic (m-Se) and trigonal (t-Se). XAS analysis appears to indicate  a Se crystallization process based on the biotransformation of amorphous Se0 into stable t-Se  nanorods. In addition, results from headspace analysis by gas chromatography-mass  spectometry (GC-MS) revealed the formation of methylated volatile Se species such as DMSe  (dimethyl selenide), DMDSe (dimethyl diselenide), and DMSeS (dimethyl selenenyl sulphide).  The biotransformation pathways and tolerance are remarkably different from those reported  with this bacterium in the presence of SeIV. The formation of crystalline Se0 nanorods could  have positive environmental implications (e.g. bioremediation) through the production of Se of  lower toxicity and higher settleability with potential industrial applications.},
organization = {Grant RTI2018. 101548.B.I00 to M.L.M awarded by the Spain  Ministry of Science and Innovation},
publisher = {Elsevier},
keywords = {Bacteria},
keywords = {Selenate},
keywords = {Reduction},
keywords = {Bioremediation},
keywords = {Nanorod},
keywords = {Volatilization},
title = {Combined bioreduction and volatilization of SeVI by Stenotrophomonas bentonitica: Formation of trigonal selenium nanorods and methylated species},
doi = {https://doi.org/10.1016/j.scitotenv.2022.160030},
author = {Ruiz Fresneda, Miguel Ángel and Fernández Cantos, María V. and Gómez Bolívar, Jaime and Pinel Cabello, María and Merroun, Mohamed Larbi},
}