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Dynamic nano-Ag colloids cytotoxicity to and accumulation by Escherichia coli: Effects of Fe3+, ionic strength and humic acid
Zhang, Weicheng1,2,3; Ning, Bingyu1,2; Sun, Caiyun1,2; Song, Ke1,2; Xu, Xin2; Fang, Tao4,5; Yao, Lunguang1,2
2020-03-01
Source PublicationJOURNAL OF ENVIRONMENTAL SCIENCES
ISSN1001-0742
Volume89Issue:1Pages:180-193
Abstract

Released Ag ions or/and Ag particles are believed to contribute to the cytotoxicity of Ag nanomaterials, and thus, the cytotoxicity and mechanism of Ag nanomaterials should be dynamic in water due to unfixed Ag particle:Agthorn ratios. Our recent research found that the cytotoxicity of PVP-Ag nanoparticles is attributable to Ag particles alone in 3 hr bioassays, and shifts to both Ag particles and released Ag+ in 48 hr bioassays. Herein, as a continued study, the cytotoxicity and accumulation of 50 and 100 nm Ag colloids in Escherichia coli were determined dynamically. The cytotoxicity and mechanisms of nanoAg colloids are dynamic throughout exposure and are derived from both Ag ions and particles. Ag accumulation by E. coli is derived mainly from extracellular Ag particles during the initial 12 hr of exposure, and thereafter mainly from intracellular Ag ions. Fe3thorn accelerates the oxidative dissolution of nano-Ag colloids, which results in decreasing amounts of Ag particles and particle-related toxicity. Nathorn stabilizes nano- Ag colloids, thereby decreasing the bioavailability of Ag particles and particle-related toxicity. Humic acid (HA) binds Agthorn to form Agthorn -HA, decreasing ion-related toxicity and binding to the E. coli surface, decreasing particle-related toxicity. HA in complex conditions showed a stronger relative contribution to toxicity and accumulation than Nathorn or Fe3thorn. The results highlighted the cytotoxicity and mechanism of nano- Ag colloids are dynamic and affected by environmental factors, and therefore exposure duration and water chemistry should be seriously considered in environmental and health risk assessments. (c) 2019 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.

KeywordCytotoxicity mechanism Accumulation Nano-Ag colloids Escherichia coli Environmental factors
DOI10.1016/j.jes.2019.10.013
Indexed BySCI
Language英语
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEnvironmental Sciences
WOS IDWOS:000504755800016
WOS KeywordSILVER NANOPARTICLES ; ZNO NANOPARTICLES ; ORGANIC-MATTER ; TOXICITY ; AGGREGATION ; DISSOLUTION ; STABILITY ; EXPOSURE ; IMPACT ; MEDIA
PublisherSCIENCE PRESS
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Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/342005/35234
Collection水环境工程研究中心_期刊论文
Corresponding AuthorFang, Tao; Yao, Lunguang
Affiliation1.Nanyang Normal Univ, Collaborat Innovat Ctr Water Secur Water Source R, Nanyang 473061, Peoples R China
2.Nanyang Normal Univ, Henan Key Lab Ecol Secur Water Source Reg Mid Lin, Nanyang 473061, Peoples R China
3.State Key Lab Motor Vehicle Biofuel Technol, Nanyang 473000, Peoples R China
4.Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Hubei, Peoples R China
5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Weicheng,Ning, Bingyu,Sun, Caiyun,et al. Dynamic nano-Ag colloids cytotoxicity to and accumulation by Escherichia coli: Effects of Fe3+, ionic strength and humic acid[J]. JOURNAL OF ENVIRONMENTAL SCIENCES,2020,89(1):180-193.
APA Zhang, Weicheng.,Ning, Bingyu.,Sun, Caiyun.,Song, Ke.,Xu, Xin.,...&Yao, Lunguang.(2020).Dynamic nano-Ag colloids cytotoxicity to and accumulation by Escherichia coli: Effects of Fe3+, ionic strength and humic acid.JOURNAL OF ENVIRONMENTAL SCIENCES,89(1),180-193.
MLA Zhang, Weicheng,et al."Dynamic nano-Ag colloids cytotoxicity to and accumulation by Escherichia coli: Effects of Fe3+, ionic strength and humic acid".JOURNAL OF ENVIRONMENTAL SCIENCES 89.1(2020):180-193.
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