The short-term toxicity of citrate-stabilized silver nanoparticles (AgNPs) and ionic silver Ag(I) to the ichthyotoxic marine raphidophyte Chattonella marina has been examined using the fluorometric indicator alamarBlue. Aggregation and dissolution of AgNPs occurred after addition to GSe medium while uptake of dissolved Ag(I) occurred in the presence of C. marina. Based on total silver mass, toxicity was much higher for Ag(I) than for AgNPs. Cysteine, a strong Ag(I) ligand, completely removed the inhibitory effects of Ag(I) and AgNPs on the metabolic activity of C. marina, suggesting that the toxicity of AgNPs was due to the release of Ag(I). Synergistic toxic effects of AgNPs/Ag(I) and C. marina to fish gill cells were observed with these effects possibly attributable to enhancement in the generation of reactive oxygen species by C. marina on exposure of the organism to silver.

Item Type:	Refereed Article
Keywords:	silver nanoparticles, superoxide, toxicity, Chattonella marina, fish gill cells
Research Division:	Earth Sciences
Research Group:	Oceanography
Research Field:	Chemical oceanography
Objective Division:	Commercial Services and Tourism
Objective Group:	Water and waste services
Objective Field:	Waste management services
UTAS Author:	Dorantes Aranda, JJ (Dr Juan Dorantes Aranda)
ID Code:	91572
Year Published:	2012
Web of Science® Times Cited:	131
Deposited By:	IMAS Research and Education Centre
Deposited On:	2014-05-22
Last Modified:	2015-08-20
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