期刊
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 23, 期 5, 页码 4334-4339出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-015-4139-x
关键词
Periphytic microalgae; Diatom; Aquatic environment; Biomineralization of gold salts; Gold nanoparticles; Contamination; Microscopy; Laboratory experiment
资金
- Agence Nationale de la Recherche (ANR) [ANR-14-CE21-0001-01]
- Agence Nationale de la Recherche (ANR) [ANR-14-CE21-0001] Funding Source: Agence Nationale de la Recherche (ANR)
Testing biotransformation capacities of living aquatic microalgae diatoms to naturally synthetize gold nanoparticles (AuNP) from gold salts and assessing aftereffects on their viability by microscope observations is a great challenge. In this work, a laboratory experiment was conducted, which aimed to observe (i) directly by transmission electronic and light microscopy and (ii) through indirect measurements (UV-visible spectroscopy) the periphytic freshwater diatom Eolimna minima exposed to gold salts. This work revealed the capacity of E. minima to intracellularly biosynthetize AuNP and to tolerate it. AuNP synthesis appears as a mechanism of detoxification to protect diatom from gold salt contamination. We also pointed out the risks associated with the spread of diatoms full of AuNP, through the trophic web of freshwater ecosystems. The preponderant part of the diatoms in natural biofilms associated with their position at the basis of the trophic webs in rivers could then make them responsible for the contamination of their consumers (grazer animals) and consequently for the potential release of AuNP through the entire food web.
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