Size-dependent ecotoxicity of barium titanate particles: the case of Chlorella vulgaris green algae

Ecotoxicology
Hudson C PoloniniRoberta Brayner

Abstract

Studies have been demonstrating that smaller particles can lead to unexpected and diverse ecotoxicological effects when compared to those caused by the bulk material. In this study, the chemical composition, size and shape, state of dispersion, and surface's charge, area and physicochemistry of micro (BT MP) and nano barium titanate (BT NP) were determined. Green algae Chlorella vulgaris grown in Bold's Basal (BB) medium or Seine River water (SRW) was used as biological indicator to assess their aquatic toxicology. Responses such as growth inhibition, cell viability, superoxide dismutase (SOD) activity, adenosine-5-triphosphate (ATP) content and photosynthetic activity were evaluated. Tetragonal BT (~170 nm, 3.24 m(2) g(-1) surface area) and cubic BT (~60 nm, 16.60 m(2) g(-1)) particles were negative, poorly dispersed, and readily aggregated. BT has a statistically significant effect on C. vulgaris growth since the lower concentration tested (1 ppm), what seems to be mediated by induced oxidative stress caused by the particles (increased SOD activity and decreased photosynthetic efficiency and intracellular ATP content). The toxic effects were more pronounced when the algae was grown in SRW. Size does not seem to be an issue in...Continue Reading

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Citations

Oct 17, 2015·International Journal of Molecular Sciences·Krystian MiazekDorothee Goffin
Aug 4, 2015·Environmental Science and Pollution Research International·Alicja Piotrowska-NiczyporukElżbieta Zambrzycka
Jun 5, 2019·Environmental Science and Pollution Research International·Anne VicenteChristophe Pagnout
Mar 29, 2019·Environmental Science and Pollution Research International·Xianliang YiHao Zhou
May 6, 2016·Nanotechnology·Giada Graziana GenchiGianni Ciofani

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