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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Toxicity of alpha-Ag2WO4 microcrystals to freshwater microalga Raphidocelis subcapitata at cellular and population levels

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Author(s):
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de Abreu, Cinthia Bruno [1, 2] ; Gebara, Renan Castelhano [1, 2] ; dos Reis, Larissa Luiza [1, 2] ; Rocha, Giseli Swerts [3] ; Goncalves Alho, Lays de Oliveira [1, 2] ; Alvarenga, Lais Mendes [4] ; Virtuoso, Luciano Sindra [4] ; Assis, Marcelo [5] ; Mansano, Adrislaine da Silva [1, 2] ; Longo, Elson [5] ; Gama Melao, Maria da Graca [1]
Total Authors: 11
Affiliation:
[1] Fed Univ Sao Carlos UFSCar, Dept Hydrobiol, Rodovia Washington Luis, Km 235, BR-13565905 Sao Carlos, SP - Brazil
[2] Fed Univ Sao Carlos UFSCar, Postgrad Program Ecol & Nat Resources PPGERN, Rodovia Washington Luis, Km 235, BR-13565905 Sao Carlos, SP - Brazil
[3] Univ Sao Paulo, Sao Carlos Sch Engn, Dept Hydraul & Sanitat NEEA CRHEA SHS, Ave Trabalhador Sao Carlense 400, BR-13560970 Sao Carlos, SP - Brazil
[4] Fed Univ Alfenas UNIFAL MG, Chem Inst, Gabriel Monteiro Silva 700, BR-37130000 Alfenas, MG - Brazil
[5] Fed Univ Sao Carlos UFSCar, Ctr Dev Funct Mat CDMF, POB 676, BR-13565905 Sao Carlos, SP - Brazil
Total Affiliations: 5
Document type: Journal article
Source: Chemosphere; v. 288, n. 2 FEB 2022.
Web of Science Citations: 0
Abstract

Silver-based materials have microbicidal action, photocatalytic activity and electronic properties. The increase in manufacturing and consumption of these compounds, given their wide functionality and application, is a source of contamination to freshwater ecosystems and causes toxicity to aquatic biota. Therefore, for the first time, we evaluated the toxicity of the silver tungstate (alpha-Ag2WO4), in different morphologies (cube and rod), for the microalga Raphidocelis subcapitata. To investigate the toxicity, we evaluated the growth rate, cell complexity and size, reactive oxygen species (ROS) production and chlorophyll a (Chl a) fluorescence. The alpha-Ag2WO4 - R (rod) was 1.7 times more toxic than alpha-Ag2WO4-C (cube), with IC10 and IC50 values of, respectively, 8.68 +/- 0.91 mu g L-1 and 13.72 +/- 1.48 mu g L-1 for alpha-Ag2WO4 - R and 18.60 +/- 1.61 mu g L-1 and 23.47 +/- 1.16 mu g L-1 for alpha-Ag2WO4-C. The release of silver ions was quantified and indicated that the silver ions dissolution from the alpha-Ag2WO4 - R ranged from 34 to 71%, while the Ag ions from the alpha-Ag2WO4-C varied from 35 to 97%. The alpha-Ag2WO4-C induced, after 24 h exposure, the increase of ROS at the lowest concentrations (8.81 and 19.32 mu g L-1), whereas the alpha-Ag2WO4 - R significantly induced ROS production at 96 hat the highest concentration (31.76 mu g L-1). Both microcrystal shapes significantly altered the cellular complexity and decreased the Chl a fluorescence at all tested concentrations. We conclude that the different morphologies of alpha-Ag2WO4 negatively affect the microalga and are important sources of silver ions leading to harmful consequences to the aquatic ecosystem. (AU)

FAPESP's process: 18/07988-5 - Bioprospecting, characterization and optimization of Brazilian microalgal strains for CO2 biofixation and bioproducts of commercial importance
Grantee:Ana Teresa Lombardi
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC