| Full text | |
| Author(s): Show less - |
de Abreu, Cinthia Bruno
;
Gebara, Renan Castelhano
;
dos Reis, Larissa Luiza
;
Rocha, Giseli Swerts
;
Goncalves Alho, Lays Oliveira
;
Alvarenga, Lais Mendes
;
Virtuoso, Luciano Sindra
;
Assis, Marcelo
;
Mansano, Adrislaine da Silva
;
Longo, Elson
;
Gama Melao, Maria da Graca
Total Authors: 11
|
| Document type: | Journal article |
| Source: | WATER AIR AND SOIL POLLUTION; v. 233, n. 4, p. 11-pg., 2022-04-01. |
| Abstract | |
The alpha-Ag2WO4 (hexagonal rod-shaped) is a multifunctional material with interesting physical and chemical properties, such as good electronic, photocatalytic, anticancer and microbicidal performance. Considering this, its use can contribute to the presence and accumulation of this compound in freshwater ecosystems. Therefore, the present study investigated the effects of alpha-Ag2WO4 on the freshwater Chlorophyceae Raphidocelis subcapitata, at the level of cell density, chlorophyll a (Chl a), total carbohydrate contents, and photosynthetic activity (maximum quantum yield and oxygen-evolving complex-OEC). The alpha-Ag2WO4 reduced cell density by similar to 48% already in the first 24 h of exposure at 31.76 mu g L-1 (highest concentration). Moreover, at 31.76 mu g L-1, we observed a drastic reduction in the maximum quantum yield, and impact in the oxygen evolving complex at 24 h and 48 h. However, our results indicated a possible recovery of the photosynthetic activity in the surviving algal cells at 72 and 96 h. The contents of chlorophyll a (Chl a) and total carbohydrates decreased significantly (Dunnett's test, p <0.05) at 4.11, 5.84, 10.55, and 10.67 mu g L-1 treatments and increased significantly (Dunnett's test, p <0.05) at the highest concentration (31.76 mu g L-1), which is possibly a mechanism for the algal cells to optimize the amount of energy to be used in the photosynthetic process and maintaining the integrity of the cell wall. This study contributes to clarifying how alpha-Ag2WO4 interacts with R. subcapitata, showing the toxicity mechanism of photosynthetic activity. This can help predict the fate and effect of these composites by providing a basis for their ecological risk assessment. (AU) | |
| 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 |
| 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 |