Degradation of arsenobetaine to inorganic arsenic by the microorganisms occurring in the suspended substances

Hanaoka, Ken’ichi; Koga, Hiromichi; Tagawa, Shoji; Kaise, Toshikazu

doi:10.1016/0305-0491(92)90345-r

Cited by 18 publications

(19 citation statements)

References 14 publications

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“…When microbes from marines sediments were cultured aerobically with arsenobetaine the major metabolite was initially trimethylarsine oxide, which, in turn, degraded to inorganic arsenic. 7 Interestingly, aerobic microbes from suspended particles were able to reduce arsenobetaine to arsenocholine, 6 and other microbes associated with deep-sea particles were shown to degrade arsenobetaine to dimethylarsinate, trimethylarsine oxide and arsenate. 11 In further experiments, it was shown 9 that, although arsenobetaine was degraded in the culture medium, the microbes contained this arsenical unchanged throughout the incubation period.…”

Section: Discussionmentioning

confidence: 99%

“…[5][6][7][8][9][10][11][12] For this reason the microbial Microbial demethylation of arsenobetaineexperiment was repeated with arsenobetaine and dimethylarsinoylacetate. On this occasion, autoclaved controls were also examined to establish that the changes observed were microbially mediated.…”

Section: Experiments 2: Biotransformation Of Arsenobetaine and Dimethymentioning

confidence: 99%

“…[2][3][4] The degradation of these marine arsenic compounds has also been studied by employing microbial systems derived from a number of marine substrates. [5][6][7][8][9][10][11][12] Such degradative processes might be expected to play an important role in the biogeochemical cycling of arsenic in the sea. Methylated arsenic compounds, such as arsenosugars in algae and arsenobetaine in animals, must be released to the sea at some point, as a consequence of grazing or predation by animals, or on senescence of the organisms.…”

Section: Introductionmentioning

confidence: 99%

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Dimethylarsinoylacetate from microbial demethylation of arsenobetaine in seawater

Khokiattiwong

Goessler

Pedersen

et al. 2001

Applied Organom Chemis

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The fate of 11 arsenic compounds in microbially enriched seawater was monitored for up to 10 days by HPLC-ICPMS. Most of the arsenicals underwent little or no change in this medium, whereas two of the compounds, arsenobetaine and arsenocholine, were completely degraded. Arsenobetaine (Me 3 As CH 2 COO À ), the predominant form of arsenic in marine animals, was transformed within hours, initially to dimethylarsinoylacetate (Me 2 As(O)CH 2 COO À ) and then to dimethylarsinate (Me 2 As(O)O À ). Arsenocholine behaved similarly but degraded at a slower rate. The identity of the new metabolite, dimethylarsinoylacetate, was confirmed by LC electrospray MS. A repeat experiment with arsenobetaine and dimethylarsinoylacetate, and employing LC electrospray MS to monitor the metabolites, produced results qualitatively identical with those from the first experiment. The rapidity of the degradation processes offers an explanation for the apparent absence of arsenobetaine in natural waters.

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Section: Discussionmentioning

confidence: 99%

Section: Experiments 2: Biotransformation Of Arsenobetaine and Dimethymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dimethylarsinoylacetate from microbial demethylation of arsenobetaine in seawater

Khokiattiwong

Goessler

Pedersen

et al. 2001

Applied Organom Chemis

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“…44 From similar experiments the additional presence of dimethylarsinate was reported. 45 Arsenobetaine was degraded by bacteria in seawater to trimethylarsine oxide and inorganic arsenic(V). 46,47 The subsequent hydrolysis of trimethylarsine oxide would be expected to result in the formation of dimethylarsinate.…”

Section: Discussionmentioning

confidence: 99%

Evidence supporting the presence of dissolved dimethylarsinate in the marine environment

Howard

Hunt

Salou

1999

Appl. Organometal. Chem.

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Experiments have been carried out to test the commonly held belief that the dissolved dimethylarsenic species present in marine waters is dimethylarsinate. By employing a novel combination of HPLC and cryogenic‐trap hydride generation atomic absorption spectroscopy (HG AA), the sensitivity limitations of conventional in‐line HPLC instrumentation can be overcome, permitting dimethylarsinate to be measured by HPLC at levels below 200 pg cm−3. A comparison of results obtained by this procedure with those obtained by direct cryogenic‐trap HG AA demonstrated that much of the dissolved dimethylarsenic present in the mouth of the Beaulieu River estuary (Hampshire, UK) had HPLC retention characteristics consistent with the presence of dimethylarsinate. Copyright © 1999 John Wiley & Sons, Ltd.

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“…The third point of interest is the presence of DMA and PO 4 -arsenoriboside as the most dominant organoarsenicals. The higher concentration of DMA in G. sootai (at S 2 ) (0.39 mg kg -1 ) and L. notocirrata (at S 4 ) (0.41 mg kg -1 ) might be related to degradation products of AB in sediments (Hanaoka et al, 1992a;1992b;1996). The PO 4 -arsenoriboside contained almost 1 mg kg -1 in each of these polychaetes, representing 21 and <1 % of total As, respectively.…”

Section: Arsenic In Polychaetes From Sundarban Wetlandmentioning

confidence: 94%

Arsenic speciation in polychaetes (Annelida) and sediments from the intertidal mudflat of Sundarban mangrove wetland, India

Watts

Barlow

Button

et al. 2012

Environ Geochem Health

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Abstract:This paper documents the concentration of total arsenic and individual arsenic species in four soft-bottom benthic polychaetes (Perenereis cultifera, Ganganereis sootai, Lumbrinereis notocirrata and Dendronereis arborifera) along with host sediments from Sundarban mangrove wetland, India. An additional six sites were considered exclusively for surface sediments for this purpose. Polychaetes were collected along with the host sediments and measured for their total arsenic using Inductively Coupled Plasma Mass Spectrometry (ICP-MS). Arsenic concentrations in polychaete body tissues varied greatly, suggesting speciesspecific characteristics and inherent peculiarities in arsenic metabolism. Arsenic was generally present in polychaetes as arsenate (As V ranges from 0.16 -0.50 mg kg -1 ) or arsenite (As III ranges from 0.10 -0.41 mg kg -1 ) (30 to 53% as inorganic As) and dimethylarsinic acid (DMA V ; <1 to 25%). Arsenobetaine (AB; <16%), and PO 4 -arsenoriboside (8 to 48%) were also detected as minor constituents, whilst monomethylarsonic acid (MA V ) was not detected in any of the polychaetes. The highest total As (14.7 mg kg -1 dry wt) was observed in the polychaete D. arborifera collected from the vicinity of a sewage outfall in which the majority of As was present as an uncharacterized compound (10.3 mg kg -1 dry wt) eluted prior to AB. Host sediments ranged from 2.5 to 10.4 mg kg -1 total As. This work supports the importance of speciation analysis of As, because of the ubiquitous occurrence of this metalloid in the environment, and its variable toxicity depending on chemical form. It is also the first work to report the composition of As species in polychaetes from the Indian Sundarban wetlands.

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Degradation of arsenobetaine to inorganic arsenic by the microorganisms occurring in the suspended substances

Cited by 18 publications

References 14 publications

Dimethylarsinoylacetate from microbial demethylation of arsenobetaine in seawater

Dimethylarsinoylacetate from microbial demethylation of arsenobetaine in seawater

Evidence supporting the presence of dissolved dimethylarsinate in the marine environment

Arsenic speciation in polychaetes (Annelida) and sediments from the intertidal mudflat of Sundarban mangrove wetland, India

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