Bioaccumulation and biotransformation of arsenic by the brown macroalga Sargassum patens C. Agardh in seawater: effects of phosphate and iron ions

Mamun, M. Abdullah Al; Omori, Yoshiki; Papry, Rimana Islam; Kosugi, Chika; Miki, Osamu; Rahman, Ismail M.M.; Mashio, Asami S.; Maki, Teruya; Hasegawa, Hiroshi

doi:10.1007/s10811-018-1721-x

Cited by 31 publications

(8 citation statements)

References 66 publications

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“…However, we conclude that the difference in ratios between seawater and in the seaweed suggests that seaweed is indeed able to differentiate between As and P. Arsenates and phosphates have similar chemical properties, which contributes to the toxicity of arsenates [ 46 ]. In marine algae, As(V) enters cells through phosphate transporters, while As(III) enters through the plasma membrane via aquaglyceroporins and hexose permeases [ 46 , 47 ]. Most of the arsenic taken up by macroalgae is stored as arsenosugars which are considered as less toxic to humans than inorganic arsenic [ 45 ].…”

Section: Resultsmentioning

confidence: 99%

Characterisation and chemometric evaluation of 17 elements in ten seaweed species from Greenland

et al. 2021

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Several Greenland seaweed species have potential as foods or food ingredients, both for local consumption and export. However, knowledge regarding their content of beneficial and deleterious elements on a species specific and geographical basis is lacking. This study investigated the content of 17 elements (As, Ca, Cd, Cr, Cu, Fe, Hg, I, K, Mg, Mn, Na, Ni, P, Pb, Se and Zn) in 77 samples of ten species (Agarum clathratum, Alaria esculenta, Ascophyllum nodosum, Fucus distichus, Fucus vesiculosus, Hedophyllum nigripes, Laminaria solidungula, Palmaria palmata, Saccharina latissima and Saccharina longicruris). Element profiles differed between species but showed similar patterns within the same family. For five species, different thallus parts were investigated separately, and showed different element profiles. A geographic origin comparison of Fucus species indicated regional differences. The seaweeds investigated were especially good sources of macrominerals (K > Na > Ca > Mg) and trace minerals, such as Fe. Iodine contents were high, especially in macroalgae of the family Laminariaceae. None of the samples exceeded the EU maximum levels for Cd, Hg or Pb, but some exceeded the stricter French regulations, especially for Cd and I. In conclusion, these ten species are promising food items.

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Section: Resultsmentioning

confidence: 99%

Characterisation and chemometric evaluation of 17 elements in ten seaweed species from Greenland

et al. 2021

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“…Arsenic is a notorious and toxic metalloid, ubiquitous in the environment. Arsenate (As(V)) is the predominant inorganic form in aqueous and aerobic environments and is strongly adsorbed onto the surface of several aquatic organisms and oxidized minerals of Fe, Mn and Al (Al Mamun et al 2019). Arsenite (As(III)) is highly abundant under anoxic environments and is adsorbed weakly onto fewer minerals, making it a more mobile oxyanion (Smedley and Kinniburgh 2002).…”

Section: Arsenicmentioning

confidence: 99%

“…However, little is known about the accumulation potential of As species in terms of Fe plaque. Al Mamun et al (2019), who studied this phenomenon, proposed that the P and Fe in the medium significantly inhibited the intracellular uptake of As(V), leading to heterogeneity in As accumulation inside/outside of tissues. Such adsorption could limit arsenic leaching but in an unknown range.…”

Section: Arsenicmentioning

confidence: 99%

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Sargassum contamination and consequences for downstream uses: a review

et al. 2020

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Sargassum spp. are brown algae present in the tropical and subtropical waters of the world's oceans. Benthic or pelagic, Sargassum spp. represent substantial amounts of biomass when drifted and massive beaching events also named "golden tides" are challenging for environmental and tourism managers. The Sargassum spp. biomass can be regarded as offering economic opportunities; however, micropollutant contamination counteracts this wealth. This review describes the contaminant uptake processes and the concentrations reached by various Sargassum species in regard to national and international norms for a variety of applications. Amongst the heavy metals, perhaps total arsenic content is the most salient: phytoaccumulation of arsenic is due to confusion in the phosphate transporter between arsenic and phosphate, thus leading Sargassum spp. to bioaccumulate arsenic actively. The levels reached could well give cause for concern across all potential applications, in particular for human and animal use. Similarly, there are concerns for the widespread applications or disposal of this biomass due to environmental impacts in the case of storage, landfill or composting. Organic micropollutants are too rarely studied to assert that there is global contamination. However, research studies focused on Sargassum spp. contamination confirmed environmental threats. But, without exhaustive analysis of routine algae contamination, the standard contamination level cannot be defined. Treating beach-cast or drifting Sargassum spp. as a waste is a Gordian knot, in that it involves investment, work and disposal surfaces, whilst not necessarily providing environmental and economic gains. However, Sargassum spp. are a raw material, a resource rich in a broad variety of constituents that could be processed for commercial applications or which could be used for production of energy. In this paper the authors review the diverse applications that can be considered and describe the relevant regulations and norms related to contaminants and effluents that need to be taken into account. However, if valorizing Sargassum spp. is currently valuable and promising, the quality of the raw material is a key starting point because fresh and sand-free algae are required: offshore gathering solutions need to be developed in order to limit Sargassum sp. contamination by pollutants from land so as to hinder algae decay.

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“…Arsenic exists in different chemical forms in aquatic systems. Two major As species in aquatic systems are arsenate (As V ), which is the most thermodynamically stable form in oxic waters, and arsenite (As III ), which is predominant in reduced-oxygen environments 3,4 . Through biotransformation processes, microorganisms like phytoplankton and bacteria can cause significant changes in the biogeochemistry of As in aquatic systems 5–8 .…”

Section: Introductionmentioning

confidence: 99%

Freshwater phytoplankton: biotransformation of inorganic arsenic to methylarsenic and organoarsenic

Hasegawa

Papry

Ikeda

et al. 2019

Sci Rep

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The biotransformation and detoxification mechanisms of arsenic (As) species have been active research topics because of their significance to environmental and human health. Biotransformation of As in phytoplankton has been extensively studied. However, how different growth phases of phytoplankton impact As biotransformation in them remains uncertain. This study investigated the biotransformation of As species in freshwater phytoplankton at different growth phases to ascertain at which growth phase different types of biotransformation occur. At the logarithmic growth phase, arsenate (As V ) (>90%) and arsenite (As III ) (>80%) predominated in culture media when phytoplankton were exposed to 20 nmol L −1 and 1.0 µmol L −1 of As V , respectively, and methylarsenic (methylAs) species were not detected in them at all. Intracellular As was mainly present in inorganic forms (iAs) at the logarithmic phase, while substantial amounts of organoarsenic (orgAs) species were detected at the stationary phase. At the stationary phase, As V comprised the majority of the total As in culture media, followed by As III and methylAs, although the methylation of As V occurred slowly at the stationary phase. Biotransformation of As V into As III and As methylation inside phytoplankton cells occurred mainly at the logarithmic phase, while the biotransformation of As into complex orgAs compounds occurred at the stationary phase. Phytoplankton rapidly released iAs and methylAs species out of their cells at the logarithmic phase, while orgAs mostly remained inside their cells.

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Bioaccumulation and biotransformation of arsenic by the brown macroalga Sargassum patens C. Agardh in seawater: effects of phosphate and iron ions

Cited by 31 publications

References 66 publications

Characterisation and chemometric evaluation of 17 elements in ten seaweed species from Greenland

Characterisation and chemometric evaluation of 17 elements in ten seaweed species from Greenland

Sargassum contamination and consequences for downstream uses: a review

Freshwater phytoplankton: biotransformation of inorganic arsenic to methylarsenic and organoarsenic

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