کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4424794 1619203 2012 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sub-toxic effects of CuO nanoparticles on bacteria: Kinetics, role of Cu ions and possible mechanisms of action
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Sub-toxic effects of CuO nanoparticles on bacteria: Kinetics, role of Cu ions and possible mechanisms of action
چکیده انگلیسی

The sub-toxic effects of CuO nanoparticles (nano-CuO) were evaluated using three recombinant luminescent Escherichia coli bacteria responding specifically to (i) reactive oxygen species (ROS), (ii) single-stranded DNA breaks and (iii) bioavailable Cu ions. Using these sensors we showed that nano-CuO induces the formation of superoxide anions, hydrogen peroxide and single-stranded DNA already at very low sub-toxic levels (0.1 mg Cu/L). The maximal sub-toxic response of all biosensors to nominal concentrations of nano-CuO, micro-CuO (size control) and CuSO4 (solubility control) occurred at ∼6, ∼600 and ∼0.6 mg Cu/L, respectively. According to the chemical analysis all the latter concentrations yielded ∼0.6 mg of soluble Cu/L, indicating that dissolution of CuO particles was the key factor triggering the ROS and DNA damage responses in bacteria. Cu-ions chelation studies also showed that CuO particles were not involved in these stress responses. The solubilization results were confirmed by Pseudomonas fluorescens Cu-ion sensor.

Figure optionsDownload as PowerPoint slideHighlights
► New ROS and DNA-damage-inducible luminescent E. coli biosensors were constructed.
► Already sub-ppm levels of nano-CuO induced the ROS, DNA damage and Cu ion sensors.
► The bacterial ROS and DNA damage response to nano-CuO was triggered by Cu ions.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Environmental Pollution - Volume 169, October 2012, Pages 81–89
نویسندگان
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