Document Detail

The effect of humic acids on the cytotoxicity of silver nanoparticles to a natural aquatic bacterial assemblage.
MedLine Citation:
PMID:  20850168     Owner:  NLM     Status:  MEDLINE    
The effect of a terrestrial humic acid (HA) and a river HA on the cytotoxicity of silver nanoparticles (AgNPs) to natural aquatic bacterial assemblages (0 μM, 2.5 μM and 5 μM) was measured with spread plate counting. The effect of HA (20 and 40 ppm) on the cytotoxicity of AgNPs ranging in size between 15 and 25 nm was tested in the presence and in the absence of natural sunlight. The experiment was a full factorial, completely randomized design and the results were analyzed using the General Linear Model in SAS. LSMEANS was used to separate the means or combinations of means. Significant main effects of all independent variables, plus interaction effects in all cases except HA/LI and HA/AgNPs/LI were observed. The toxicity of AgNPs to natural aquatic bacterial assemblages appears to be concentration dependent for concentrations between 0 μM and 5 μM. The data indicate that the light exposure inhibited viability more than the darkness exposure. The HA treatment groups in the presence of light showed greater reduced viability count compared to darkness exposure groups. The inhibition of bacterial viability counts by AgNPs exposure was less in the light treatment groups containing a terrestrial HA compared to that with a river HA. Difference in the extent of reactive oxygen species formation and adsorption/binding of AgNPs was speculated to account for the observed phenomenon.
Thabitha P Dasari; Huey-Min Hwang
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2010-09-17
Journal Detail:
Title:  The Science of the total environment     Volume:  408     ISSN:  1879-1026     ISO Abbreviation:  Sci. Total Environ.     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-10-25     Completed Date:  2010-12-13     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0330500     Medline TA:  Sci Total Environ     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  5817-23     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 Elsevier B.V. All rights reserved.
Environmental Science Ph.D. Program, Jackson State University, Jackson, MS 39217, USA.
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MeSH Terms
Bacteria / drug effects*
Environmental Remediation / methods
Humic Substances*
Metal Nanoparticles / chemistry,  toxicity*
Rivers / chemistry,  microbiology
Silver / chemistry,  toxicity*
Water Microbiology
Water Pollutants, Chemical / chemistry,  toxicity*
Reg. No./Substance:
0/Humic Substances; 0/Water Pollutants, Chemical; 7440-22-4/Silver

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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