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Title: Evaluate the potential toxicity of quantum dots on bacterial metabolism by microcalorimetry
Date: 1/2013
  Link to Journal Abstract
Abstract: Herein, we evaluated the toxic effects of mercaptoacetic acid (MAA)-CdSe quantum dots (QDs), MAA-CdSe/ZnS QDs and cysteamine (CA)-CdSe/ZnS QDs on the growth of both Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) by microcalorimetry. Thermogenic curves of bacteria were recorded and bioeffects of QDs on bacteria were investigated. The results suggested that both MAA-CdSe QDs and MAA-CdSe/ZnS QDs inhibited the E. coli growth but stimulated the S. aureus growth with dose-dependent type. The inhibition or stimulation efficiency of QDs on E. coli or S. aureus growth all decreased dramatically after UV irradiation, which was due to the liberation of more toxic Cd2+. In addition, MAA-CdSe/ZnS QDs and CA-CdSe/ZnS QDs affected the growth of E. coli and S. aureus differently. MAA-CdSe/ZnS QDs could not affect the growth of bacteria, while CA-CdSe/ZnS QDs inhibited the bacterial growth dramatically, which resulted from the negative charge on the surface of these bacteria.
Non-technical Summary: In this study, the authors evaluated the toxic effects of mercaptoacetic acid (MAA)-CdSe quantum dots (QDs), MAA-CdSe/ZnS QDs and cysteamine (CA)-CdSe/ZnS QDs on the growth of both Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) by microcalorimetry. Thermogenic curves of bacteria were recorded and bioeffects of QDs on bacteria were investigated.
Content Emphasis Peer Reviewed Journal Article
Exposure Or Hazard Target Other/Unspecified
Exposure Pathway Other/Unspecified
Method Of Study Environmental Study
Paper Type Environmental Fate and Transport
Particle Type Semiconductor
Production Method Engineered
Risk Exposure Group Ecosystem
Target Audience Technical Research
Citation: Thermochimica Acta, 552: 98-105 (January 2013)
Publication: Thermochimica Acta
Author: Xiao Q, Huang S, Su W, Li P, Liu Y
Volume: 552
Pages: 98-105
     


Last updated on March 20, 2013
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This work is supported in part by the Nanoscale Science and Engineering Initiative of the National Science Foundation
under NSF Award Number EEC-0118007.

 		 
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