Eco-friendly profile of pegylated nano-graphene oxide at different levels of an aquatic trophic chain
authors Loureiro, S; Goncalves, SF; Goncalves, G; Hortiguela, MJ; Rebelo, S; Ferro, MC; Vila, M
nationality International
journal ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
author keywords nGO-PEG; Daphnia; Algae; Fish; Radiation
keywords IN-VITRO; WATER; TOXICITY; NANOMATERIALS; INHIBITION; NANOSHEETS
abstract Nanographene oxide (nGO) has been recently proposed as a new antitumoral therapeutic agent, drug delivery carrier and gene transfection vehicle, among others. Treatment is carried out by hyperthermia induced by infrared irradiation. After treatment, the nanosystems will be inevitably excreted and released to the environment. To understand the potential impacts of pegylated nGO (nGO-PEG), three key species from different trophic levels were used: the green micro-algae Raphidocelis subcapitata (growth inhibition test), the cladocera Daphnia magna (acute and chronic tests), and the fish Danio rerio (fish embryo test). Besides a regular standard procedure to assess toxicity, and considering the mode of action of nGO-PEG in cancer treatment, a simultaneous infrared lamp exposure was carried out for D. magna and D. rerio. Additionally, and taking advantage of the phenotypic transparency of D. magna, nGO-PEG was fluorescently tagged to evaluate the potential uptake of nGO-PEG. The R. subcapitata growth inhibition test showed effects during the first 48 h, recovering till the end of the test (96 h). No acute or chronic effects were observed for D. magna, under standard or infrared light exposures although confocal microscope images showed nGO-PEG uptake. Very small percentages of mortality and abnormalities were observed in D. rerio exposed with and without the infrared lamp. Although low hazard may be expected for nGO-PEG in aquatic ecosystems, further studies with species with different life traits should be accomplished, in order to derive more accurate conclusions.
publisher ACADEMIC PRESS INC ELSEVIER SCIENCE
issn 0147-6513
year published 2018
volume 162
beginning page 192
ending page 200
digital object identifier (doi) 10.1016/j.ecoenv.2018.06.078
web of science category Environmental Sciences; Toxicology
subject category Environmental Sciences & Ecology; Toxicology
unique article identifier WOS:000440879500024
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journal impact factor 4.872
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