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Toxicity Effect of Silver Nanoparticles on Photosynthetic Pigment Content, Growth, ROS Production and Ultrastructural Changes of Microalgae Chlorella vulgaris

1
Department of Biology, College of Science, University of Bahrain, P.O. Box 32038, Zallaq 1054, Bahrain
2
Department of Genetics and Bioengineering, Yeditepe University, Atasehir 34755, Istanbul, Turkey
3
Laboratoire de Physiologie Cellulaire, INSERM U.1003, Université de Lille, Rue Paul Langevin, 59655 Villeneuve d’Ascq, France
4
Univ. Lille, CNRS, Centrale Lille, ISEN, Univ. Valenciennes, UMR 8520-IEMN, F-59000 Lille, France
5
Department of Physics, College of Science, University of Bahrain, P.O. Box 32038, Zallaq 1054, Bahrain
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(7), 914; https://doi.org/10.3390/nano9070914
Received: 3 June 2019 / Revised: 18 June 2019 / Accepted: 20 June 2019 / Published: 26 June 2019
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PDF [2724 KB, uploaded 26 June 2019]
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Abstract

Silver nanoparticles (Ag NPs) exhibit antibacterial activity and are extensively used in numerous applications. The aim of this study was to examine the toxic effect of Ag NPs on the marine microalga, Chlorella vulgaris. The microalgae, at the exponential growth phase, were treated with different concentrations of Ag NPs (50 and 100 nm) for 96 h. X-Ray diffraction (XRD) results indicated that the used NPs are single and pure Ag phase with a mean crystallite size of 21 and 32 nm. Ag NPs were found to have a negative effect on viable cell concentration, a variable effect on chlorophyll a concentration, and increased ROS formation. Transmission electron microscopy (TEM) analysis revealed that Ag NPs were present inside the microalgae cells and formed large aggregates in the culture medium. Ag+ ions, in the form of AgNO3, were also assessed at higher concentrations and found to cause inhibitory effects. View Full-Text
Keywords: silver nanoparticles; Ag ions; Chlorella vulgaris; viable cells; chlorophyll a; reactive oxygen species silver nanoparticles; Ag ions; Chlorella vulgaris; viable cells; chlorophyll a; reactive oxygen species
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Hazeem, L.J.; Kuku, G.; Dewailly, E.; Slomianny, C.; Barras, A.; Hamdi, A.; Boukherroub, R.; Culha, M.; Bououdina, M. Toxicity Effect of Silver Nanoparticles on Photosynthetic Pigment Content, Growth, ROS Production and Ultrastructural Changes of Microalgae Chlorella vulgaris. Nanomaterials 2019, 9, 914.

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