کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
600515 1454302 2013 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Interaction between Escherichia coli and TiO2 nanoparticles in natural and artificial waters
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Interaction between Escherichia coli and TiO2 nanoparticles in natural and artificial waters
چکیده انگلیسی

Seine River water was used as a natural environmental medium to quantify the ecotoxicological impact of three types of manufactured titanium dioxide (TiO2) nanoparticles toward the model bacterium Escherichia coli. Under ambient light, a significant toxicity starting at 10 ppm of TiO2 in water was observed. Presence of the anatase polymorph slightly increased the toxicity in comparison to pure rutile samples. Furthermore, the toxicity was found to be lower at pH 5 compared to Seine water (pH 8). To assess the nanoparticles state of dispersion and their interactions with bacteria, cryogenic transmission electron microscopy (TEM) and zeta potential measurements were performed. A higher sorption of nanoparticle aggregates on cells is observed at pH 5 compared to Seine water. This allows concluding that the observed toxicity is not directly linked to the particles sorption onto the cell surfaces. In spite of stronger interaction between cells and nanoparticles at pH 5, a bacterial subpopulation apparently non-interacting with nanoparticles is evidenced by both TEM and zeta potential measurements. Such heterogeneities in cell populations can increase global bacterial resistance to TiO2 nanoparticles.

Figure optionsDownload as PowerPoint slideHighlights
► We assess the toxicity of TiO2 nanoparticles toward E. coli bacteria.
► We use natural water to simulate nanoparticles aggregation in the environment.
► Bacterial survival is affected by TiO2 NPs presence (mild mortality).
► Contact between cells and NPs is not necessary for toxicity.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces B: Biointerfaces - Volume 102, 1 February 2013, Pages 158–164
نویسندگان
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