Acute toxicity of TiO2 nanoparticles to Ceriodaphnia dubia under visible light and dark conditions in a freshwater system.

The ever increasing industrial and consumer applications of titanium dioxide nanoparticles (TiO2 NPs) raise concern over the possible risk associated with their environmental exposure. Still, the knowledge regarding nanoparticle behavior in a freshwater ecosystem is lacking. The current study focuse...

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Autores principales:	Swayamprava Dalai, Sunandan Pakrashi, Natarajan Chandrasekaran, Amitava Mukherjee
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2013
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/5795151c669544e0a3d8d93863cd9add
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spelling	oai:doaj.org-article:5795151c669544e0a3d8d93863cd9add2021-11-18T07:47:33ZAcute toxicity of TiO2 nanoparticles to Ceriodaphnia dubia under visible light and dark conditions in a freshwater system.1932-620310.1371/journal.pone.0062970https://doaj.org/article/5795151c669544e0a3d8d93863cd9add2013-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23658658/?tool=EBIhttps://doaj.org/toc/1932-6203The ever increasing industrial and consumer applications of titanium dioxide nanoparticles (TiO2 NPs) raise concern over the possible risk associated with their environmental exposure. Still, the knowledge regarding nanoparticle behavior in a freshwater ecosystem is lacking. The current study focuses on the toxicity of TiO2 NPs towards Ceriodaphnia dubia (a dominant daphnid isolated from the freshwater) under two different conditions; (1) light and dark photoperiod (16:8 h) and (2) continuous dark conditions, for a period of 48 h. An increase in toxicity was observed with an increase in the concentration, until a certain threshold level (under both photoperiod and dark conditions), and beyond which, reduction was noted. The decrease in toxicity would have resulted from the aggregation and settling of NPs, making them less bioavailable. The oxidative stress was one of the major contributors towards cytotoxicity under both photoperiod and dark conditions. The slow depuration of TiO2 NPs under the photoperiod conditions confirmed a higher NP bioaccumulation and thus a higher bioconcentration factor (BCF) compared to dark conditions. The transmission electron micrographs confirmed the bioaccumulation of NPs and damage of tissues in the gut lining.Swayamprava DalaiSunandan PakrashiNatarajan ChandrasekaranAmitava MukherjeePublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 8, Iss 4, p e62970 (2013)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Swayamprava Dalai Sunandan Pakrashi Natarajan Chandrasekaran Amitava Mukherjee Acute toxicity of TiO2 nanoparticles to Ceriodaphnia dubia under visible light and dark conditions in a freshwater system.
description	The ever increasing industrial and consumer applications of titanium dioxide nanoparticles (TiO2 NPs) raise concern over the possible risk associated with their environmental exposure. Still, the knowledge regarding nanoparticle behavior in a freshwater ecosystem is lacking. The current study focuses on the toxicity of TiO2 NPs towards Ceriodaphnia dubia (a dominant daphnid isolated from the freshwater) under two different conditions; (1) light and dark photoperiod (16:8 h) and (2) continuous dark conditions, for a period of 48 h. An increase in toxicity was observed with an increase in the concentration, until a certain threshold level (under both photoperiod and dark conditions), and beyond which, reduction was noted. The decrease in toxicity would have resulted from the aggregation and settling of NPs, making them less bioavailable. The oxidative stress was one of the major contributors towards cytotoxicity under both photoperiod and dark conditions. The slow depuration of TiO2 NPs under the photoperiod conditions confirmed a higher NP bioaccumulation and thus a higher bioconcentration factor (BCF) compared to dark conditions. The transmission electron micrographs confirmed the bioaccumulation of NPs and damage of tissues in the gut lining.
format	article
author	Swayamprava Dalai Sunandan Pakrashi Natarajan Chandrasekaran Amitava Mukherjee
author_facet	Swayamprava Dalai Sunandan Pakrashi Natarajan Chandrasekaran Amitava Mukherjee
author_sort	Swayamprava Dalai
title	Acute toxicity of TiO2 nanoparticles to Ceriodaphnia dubia under visible light and dark conditions in a freshwater system.
title_short	Acute toxicity of TiO2 nanoparticles to Ceriodaphnia dubia under visible light and dark conditions in a freshwater system.
title_full	Acute toxicity of TiO2 nanoparticles to Ceriodaphnia dubia under visible light and dark conditions in a freshwater system.
title_fullStr	Acute toxicity of TiO2 nanoparticles to Ceriodaphnia dubia under visible light and dark conditions in a freshwater system.
title_full_unstemmed	Acute toxicity of TiO2 nanoparticles to Ceriodaphnia dubia under visible light and dark conditions in a freshwater system.
title_sort	acute toxicity of tio2 nanoparticles to ceriodaphnia dubia under visible light and dark conditions in a freshwater system.
publisher	Public Library of Science (PLoS)
publishDate	2013
url	https://doaj.org/article/5795151c669544e0a3d8d93863cd9add
work_keys_str_mv	AT swayampravadalai acutetoxicityoftio2nanoparticlestoceriodaphniadubiaundervisiblelightanddarkconditionsinafreshwatersystem AT sunandanpakrashi acutetoxicityoftio2nanoparticlestoceriodaphniadubiaundervisiblelightanddarkconditionsinafreshwatersystem AT natarajanchandrasekaran acutetoxicityoftio2nanoparticlestoceriodaphniadubiaundervisiblelightanddarkconditionsinafreshwatersystem AT amitavamukherjee acutetoxicityoftio2nanoparticlestoceriodaphniadubiaundervisiblelightanddarkconditionsinafreshwatersystem
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Acute toxicity of TiO2 nanoparticles to Ceriodaphnia dubia under visible light and dark conditions in a freshwater system.

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