Abstract
The increase in synthesis and application of silver nanoparticles (AgNPs) in the last decade has resulted in contamination of AgNPs in the aquatic environment. The presence of AgNPs in aquatic environments has posed toxic effects to aquatic organisms and ecological damage. In this study, two tropical microalgae species including the freshwater Scenedesmus sp. and the marine diatom Thalassiosira sp. were employed to examine the toxic effects of AgNPs. The toxic effects were determined by analyzing different end points, such as half maximal effective concentration (EC50), algae growth inhibition, algae cell size, chlorophyll-a content, and total lipid accumulation. The results suggested that AgNPs presented different toxicity mechanisms for microalgae and showed to be more toxic in freshwater than in marine environment. The EC50 values of AgNPs after 72 h for the growth inhibition of Scenedesmus sp. and Thalassiosira sp. were 89.92 ± 9.68 and 107.21 ± 7.43 μg/L, respectively. AgNPs at a certain concentration have resulted in change in cell diameter, reduction in chlorophyll-a content, and enhancement of the total lipid production in the tested microalgae. Thus, local species should be involved in the toxic assessment. This research contributes on understanding the toxicity of AgNPs on freshwater and marine environments.
Highlights
Sustainable Management of Natural Resources and Environment Research Group, Faculty of Environment and Labour Safety, Ton Duc ang University, Ho Chi Minh City, Vietnam
Two tropical microalgae species including the freshwater Scenedesmus sp. and the marine diatom alassiosira sp. were employed to examine the toxic effects of AgNPs. e toxic effects were determined by analyzing different end points, such as half maximal effective concentration (EC50), algae growth inhibition, algae cell size, chlorophyll-a content, and total lipid accumulation. e results suggested that AgNPs presented different toxicity mechanisms for microalgae and showed to be more toxic in freshwater than in marine environment. e EC50 values of AgNPs after 72 h for the growth inhibition of Scenedesmus sp. and alassiosira sp. were 89.92 ± 9.68 and 107.21 ± 7.43 μg/L, respectively
AgNPs at a certain concentration have resulted in change in cell diameter, reduction in chlorophyll-a content, and enhancement of the total lipid production in the tested microalgae. us, local species should be involved in the toxic assessment. is research contributes on understanding the toxicity of AgNPs on freshwater and marine environments
Summary
Sustainable Management of Natural Resources and Environment Research Group, Faculty of Environment and Labour Safety, Ton Duc ang University, Ho Chi Minh City, Vietnam. Were employed to examine the toxic effects of AgNPs. e toxic effects were determined by analyzing different end points, such as half maximal effective concentration (EC50), algae growth inhibition, algae cell size, chlorophyll-a content, and total lipid accumulation. Viable algal cells, increased reactive oxygen species (ROS) formation, and lipid peroxidation in the freshwater microalga Chlorella vulgaris and marine microalga Dunaliella tertiolecta were observed after exposure to AgNPs for 24 h [16]. Erefore, the aims of this study was to investigate the toxicity of AgNPs to different species including the freshwater microalgae, Scenedesmus sp. E toxic effects were determined by analyzing different end points, such as half maximal effective concentration (EC50), algae growth inhibition, algae cell size, chlorophyll-a content, and total lipid production The adverse effects of AgNPs on different organisms have been reported, previous studies focus largely on freshwater environment [6]. ere is little understanding about toxic effects of AgNPs on marine species, the ones from tropical region. erefore, the aims of this study was to investigate the toxicity of AgNPs to different species including the freshwater microalgae, Scenedesmus sp. (Chlorophyceae), and the marine diatom, alassiosira sp. (Bacillariophyceae). e toxic effects were determined by analyzing different end points, such as half maximal effective concentration (EC50), algae growth inhibition, algae cell size, chlorophyll-a content, and total lipid production
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