Santiago-Morales, J. and Rosal, R. and Hernando, M.D. and Ulaszewska, M.M. and García-Calvo, E. and Fernández-Alba, A.R. (2014) Fate and transformation products of amine-terminated PAMAM dendrimers under ozonation and irradiation. Journal of Hazardous Materials, 266. pp. 102-113. ISSN 03043894
Full text not available from this repository.Abstract
This article deals with the degradation of a third-generation (G3) poly(amidoamine) (PAMAM) dendrimer under ozonation and irradiation. The identification and quantification of G3 PAMAM dendrimer and its transformation products has been performed by liquid chromatography-electrospray ionization-hybrid quadrupole time-of-flight-mass spectrometry. The dendrimer was completely depleted by ozone in less than 1 min. The effect of ultraviolet irradiation was attributed to hydroxyl-mediated oxidation. The transformation products were attributed to the oxidation of amines, which resulted in highly oxidized structures with abundance of carboxylic acids, which started from the formation of amine oxide and the scission of the C-N bond of the amide group. We studied the toxicity of treated mixtures for six different organisms: the acute toxicity for the bacterium Vibrio fischeri and the microcrustacean Daphnia magna, the multigenerational growth inhibition of the alga Pseudokirchneriella subcapitata, and the seed germination phytotoxicity of Licopersicon esculentum, Lactuca sativa and Lolium perenne. Ozonation and irradiation originated transformation products are more toxic than the parent dendrimer. The toxicity of the dendrimer for the green alga was linked to a strong increase of intracellular reactive oxygen species with intense lipid peroxidation. (C) 2013 Elsevier B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | PAMAM dendrimer; Ozonation; Ultraviolet irradiation; Transformation products; Liquid chromatography–electrospray; ionization quadrupole/time-of-flight mass; spectrometry |
| Subjects: | T Technology > TD Environmental technology. Sanitary engineering T Technology > TP Chemical technology |
| Depositing User: | José Ángel Gómez Martín |
| Date Deposited: | 29 Apr 2014 08:40 |
| Last Modified: | 29 Apr 2014 08:40 |
| URI: | http://eprints.imdea-agua.org:13000/id/eprint/408 |
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