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Alam MS, Wong KH, Ishikawa A, Li M, Zai Y, Papry RI, Mashio AS, Rahman IMM, Hasegawa H. Exploring phosphate impact on arsenate uptake and distribution in freshwater phytoplankton: Insights from single-cell ICP-MS. CHEMOSPHERE 2024; 364:143129. [PMID: 39159762 DOI: 10.1016/j.chemosphere.2024.143129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2024] [Revised: 08/04/2024] [Accepted: 08/17/2024] [Indexed: 08/21/2024]
Abstract
In this study, we investigated the interaction between arsenate (AsV) and phosphate (PO43-) in freshwater phytoplankton using single-cell inductively coupled plasma mass spectrometry (SC-ICP-MS). This study aimed to elucidate the influence of varying PO43- concentrations on arsenic (As) uptake and distribution at the single-cell level, providing insights into intraspecies diversity. Two species of freshwater phytoplanktons, Scenedesmus acutus and Pediastrum duplex, were cultured under different concentrations of PO43- and AsV in a controlled laboratory environment. Scenedesmus acutus, a species with strong salt tolerance, and Pediastrum duplex, known for its weak salt tolerance, were selected based on their contrasting behaviors in previous studies. SC-ICP-MS revealed non-uniform uptake of As by individual phytoplankton cells, with distinct variations in response to PO43- availability. Arsenic uptake by both species declined with a high PO43- level after 7 days of exposure. However, after 14 days, As uptake increased in S. acutus with higher PO43- concentrations, but decreased in P. duplex. Moreover, our findings revealed differences in cell morphology and membrane integrity between the two species in response to AsV and various PO43- concentrations. S. acutus maintained cell integrity under all experimental culture conditions, whereas P. duplex experienced cell lysis at elevated AsV and PO43- concentrations. This study highlights the varying responses of freshwater phytoplankton to changes in AsV and PO43- levels and underscores the advantages of SC-ICP-MS over conventional ICP-MS in providing detailed, cellular level insights. These findings are crucial for understanding and managing As pollution in aquatic ecosystems.
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Affiliation(s)
- Md Shah Alam
- Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan.
| | - Kuo H Wong
- Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan.
| | - Akari Ishikawa
- Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
| | - Meng Li
- Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
| | - Yinghan Zai
- Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
| | - Rimana Islam Papry
- Department of Environmental Science, College of Agricultural Sciences, IUBAT-International University of Business Agriculture and Technology, 4 Embankment Road, Sector 10, Uttara, Dhaka, 1230, Bangladesh
| | - Asami S Mashio
- Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
| | - Ismail M M Rahman
- Institute of Environmental Radioactivity, Fukushima University, 1 Kanayagawa, Fukushima City, Fukushima 960-1296, Japan
| | - Hiroshi Hasegawa
- Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan.
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Liu T, Lin H, Zhang L. Arsenic bioaccumulation and biotransformation in the marine copepod Tigriopus japonicus under chronic dietborne and waterborne exposure. JOURNAL OF HAZARDOUS MATERIALS 2024; 474:134655. [PMID: 38805822 DOI: 10.1016/j.jhazmat.2024.134655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2024] [Revised: 05/09/2024] [Accepted: 05/17/2024] [Indexed: 05/30/2024]
Abstract
Arsenic (As) can be transferred along the food chain, while little is known about the toxic effects of dietborne As on marine copepods. In this study, we investigated the short-term and long-term effects of waterborne and dietborne As exposure on the bioaccumulation and biotransformation, as well as developmental toxicity of Tigriopus japonicus. Under acute As exposure, As bioaccumulation increased and reached a plateau with increasing exposure concentration. Moreover, As accumulation at dietborne exposure was 4.3 and 5.7 times greater than that at control group for AsIII and AsV, respectively. At chronic As exposure, As accumulation increased continuously with exposure time, with a 2.8-day extension of development time and a 45% reduction in 10-d fecundity under dietborne exposure compared to control, whereas 2.3-day extension of development time and a 20% reduction in 10-d fecundity were observed under waterborne exposure. Among As species, inorganic As had the highest concentrations, but the proportion of inorganic As decreased from 89% to 63% during 4 to 21 d of exposure, suggesting the conversion of inorganic As to organic As. The organic As was dominated by arsenobetaine (AsB, 13-25%), followed by monomethylarsenic (MMA, 8-25%). These results suggest that dietborne exposure has more pronounced toxic effects on T. japonicus, but the toxicity of As could be reduced through biotransformation under chronic exposure. Therefore, the arsenic species should be considered when assessing As toxicity.
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Affiliation(s)
- Tianrui Liu
- Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Haoye Lin
- Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Li Zhang
- Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China; Sanya Institute of Ocean Eco-Environmental Engineering, Sanya 572025, China.
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Machado CB, Marsh R, Hargreaves JK, Oxenford HA, Maddix GM, Webber DF, Webber M, Tonon T. Changes in holopelagic Sargassum spp. biomass composition across an unusual year. Proc Natl Acad Sci U S A 2024; 121:e2312173121. [PMID: 38805287 PMCID: PMC11161783 DOI: 10.1073/pnas.2312173121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Accepted: 04/06/2024] [Indexed: 05/30/2024] Open
Abstract
The year 2021 marked a decade of holopelagic sargassum (morphotypes Sargassum natans I and VIII, and Sargassum fluitans III) stranding on the Caribbean and West African coasts. Beaching of millions of tons of sargassum negatively impacts coastal ecosystems, economies, and human health. Additionally, the La Soufrière volcano erupted in St. Vincent in April 2021, at the start of the sargassum season. We investigated potential monthly variations in morphotype abundance and biomass composition of sargassum harvested in Jamaica and assessed the influence of processing methods (shade-drying vs. frozen samples) and of volcanic ash exposure on biochemical and elemental components. S. fluitans III was the most abundant morphotype across the year. Limited monthly variations were observed for key brown algal components (phlorotannins, fucoxanthin, and alginate). Shade-drying did not significantly alter the contents of proteins but affected levels of phlorotannins, fucoxanthin, mannitol, and alginate. Simulation of sargassum and volcanic ash drift combined with age statistics suggested that sargassum potentially shared the surface layer with ash for ~50 d, approximately 100 d before stranding in Jamaica. Integrated elemental analysis of volcanic ash, ambient seawater, and sargassum biomass showed that algae harvested from August had accumulated P, Al, Fe, Mn, Zn, and Ni, probably from the ash, and contained less As. This ash fingerprint confirmed the geographical origin and drift timescale of sargassum. Since environmental conditions and processing methods influence biomass composition, efforts should continue to improve understanding, forecasting, monitoring, and valorizing sargassum, particularly as strandings of sargassum show no sign of abating.
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Affiliation(s)
- Carla Botelho Machado
- Centre for Novel Agricultural Products, Department of Biology, University of York, YorkYO10 5DD, United Kingdom
| | - Robert Marsh
- School of Ocean and Earth Science, University of Southampton, SouthamptonSO14 3ZH, United Kingdom
| | | | - Hazel A. Oxenford
- Centre for Resource Management and Environmental Studies, University of the West Indies, Cave HillBB 11000, Barbados
| | - Gina-Marie Maddix
- Centre for Marine Sciences, Department of Life Sciences, University of the West Indies, MonaKingston 7, Jamaica
| | - Dale F. Webber
- Centre for Marine Sciences, Department of Life Sciences, University of the West Indies, MonaKingston 7, Jamaica
| | - Mona Webber
- Department of Life Sciences, University of the West Indies, MonaKingston 7, Jamaica
| | - Thierry Tonon
- Centre for Novel Agricultural Products, Department of Biology, University of York, YorkYO10 5DD, United Kingdom
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Susanto E, Mustajab RM, Kamil M, Atho'illah MF, Riyadi PH, Kurniasih RA, Pangestuti R, Prasetyo DYB. Unlocking Nature's Potential: A Comparative Study of Bioactive Compounds Extracted from Tropical Microalgae. Mol Biotechnol 2024:10.1007/s12033-024-01080-2. [PMID: 38300455 DOI: 10.1007/s12033-024-01080-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Accepted: 01/12/2024] [Indexed: 02/02/2024]
Abstract
To promote the use of marine microalgae for nutraceuticals, we aimed to characterize extracts of Nannochloropsis oculata, Porphyridium cruentum, and Skeletonema costatum, all of which harbor numerous bioactive substances. Chlorophylls and carotenoids were identified as the primary pigments in N. oculata and S. costatum extracts. Furthermore, the total phenolic and total flavonoid contents in the three microalgae ranged 20.32-21.96 mg GAE/g and 0.3-2.1 mg QE/g, respectively. Notably, the extract of N. oculata exhibited the most significant radical scavenging activity in both 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid (ABTS) assays, with flavonoids and pigments identified as the main contributors to antioxidant activities. Our results revealed variations in metabolite profiles among the microalgal extracts: N. oculata extract (43 types), P. cruentum (13 types), and S. costatum (21 types). Hexadecanamide emerged as the major metabolite detected in all microalgae. Collectively, the results of the present study may open new avenues of microalgae for various applications.
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Affiliation(s)
- Eko Susanto
- Department of Fisheries Product Technology, Faculty of Fisheries and Marine Science, Universitas Diponegoro, Jl. Prof. Jacub Rais, Tembalang, Semarang, Jawa Tengah, 50275, Indonesia.
| | - Rabbani Mahir Mustajab
- Department of Fisheries Product Technology, Faculty of Fisheries and Marine Science, Universitas Diponegoro, Jl. Prof. Jacub Rais, Tembalang, Semarang, Jawa Tengah, 50275, Indonesia
| | - Mustofa Kamil
- Department of Fisheries Product Technology, Faculty of Fisheries and Marine Science, Universitas Diponegoro, Jl. Prof. Jacub Rais, Tembalang, Semarang, Jawa Tengah, 50275, Indonesia
| | - Mochammad Fitri Atho'illah
- Department of Biology, Faculty of Mathematics and Natural Sciences, Universitas Brawijaya, Jl. Veteran, Malang, Jawa Timur, 65145, Indonesia
| | - Putut Har Riyadi
- Department of Fisheries Product Technology, Faculty of Fisheries and Marine Science, Universitas Diponegoro, Jl. Prof. Jacub Rais, Tembalang, Semarang, Jawa Tengah, 50275, Indonesia
| | - Retno Ayu Kurniasih
- Department of Fisheries Product Technology, Faculty of Fisheries and Marine Science, Universitas Diponegoro, Jl. Prof. Jacub Rais, Tembalang, Semarang, Jawa Tengah, 50275, Indonesia
| | - Ratih Pangestuti
- Research Centre for Food Processing and Technology, National Research and Innovation Agency, Playen Gunung Kidul Yogyakarta, Yogyakarta, 55861, Indonesia
| | - Dwi Yanuar Budi Prasetyo
- Study Program of Fisheries Sciences, Nahdlatul Ulama University of Purwokerto, Jl. Sultan Agung, Banyumas, Jawa Tengah, 53144, Indonesia
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Ma Q, Zhang L. The influences of dissolved inorganic and organic phosphorus on arsenate toxicity in marine diatom Skeletonema costatum and dinoflagellate Amphidinium carterae. JOURNAL OF HAZARDOUS MATERIALS 2023; 453:131432. [PMID: 37080037 DOI: 10.1016/j.jhazmat.2023.131432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Revised: 04/05/2023] [Accepted: 04/15/2023] [Indexed: 05/03/2023]
Abstract
In this study, arsenate (As(V)) uptake, bioaccumulation, subcellular distribution and biotransformation were assessed in the marine diatom Skeletonema costatum and dinoflagellate Amphidinium carterae cultured in dissolved inorganic phosphorus (DIP) and dissolved organic phosphorus (DOP). The results of 3-days As(V) exposure showed that As(V) was more toxic in DOP cultures than in DIP counterparts. The higher As accumulation contributed to more severe As(V) toxicity. The 4-h As(V) uptake kinetics followed Michaelis-Menten kinetics. The maximum uptake rates were higher in DOP cultures than those in DIP counterparts. After P addition, the half-saturation constants remained constant in S. costatum (2.42-3.07 μM) but decreased in A. carterae (from 10.9 to 3.8 μM) compared with that in the respective P-depleted counterparts. During long-term As(V) exposure, A. carterae accumulated more As than S. costatum. Simultaneously, As(V) was reduced and transformed into organic As species in DIP-cultured S. costatum, which was severely inhibited in their DOP counterparts. Only As(V) reduction occurred in A. carterae. Overall, this study demonstrated species-specific effects of DOP on As(V) toxicity, and thus provide a new insight into the relationship between As contamination and eutrophication on the basis of marine microalgae.
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Affiliation(s)
- Qunhuan Ma
- Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Li Zhang
- Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China.
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