Stability of microcystins from cyanobacteria—II. Effect of UV light on decomposition and isomerization

Tsuji, Kiyomi; Watanuki, Tomohiko; Kondo, Fumio; Watanabe, Mariyo F.; Suzuki, Sukeji; Nakazawa, Hiroyuki; Suzuki, Makoto; Uchida, Hideaki; Harada, Kenichi

doi:10.1016/0041-0101(95)00101-8

Cited by 183 publications

(111 citation statements)

References 21 publications

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“…Rinehart et al (1988) determined the stereochemistry of Adda as 2S, 3S, 8S, 9S. The geometrical isomers of microcystins and nodularins, (6Z)Adda and (4Z)Adda, can be formed under sunlight irradiation , Tsuji et al 1995. It has been estimated that toxic blooms usually contain 5-15% of geometrical isomers of cyclic microcystins (Harada et al 1990).…”

Section: Nodularins In the Coastal Waters Of The Gulf Of Gdańskmentioning

confidence: 99%

Cyanobacterial hepatotoxins, microcystins and nodularins, in fresh and brackish waters of the Pomeranian Province, northern Poland

Mazur‐Marzec

Spoof

Kobos

et al. 2008

Oceanological and Hydrobiological Studies

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Microcystins (MCs) and structurally related nodularins (NODs) are hepatotoxic cyclic peptides produced by bloom-forming cyanobacteria. These toxins have been implicated in the deaths of wild and domestic animals as well as in incidents of human illness. Cyanobacterial toxins occurring in the fresh and brackish waters of the Pomeranian Province, northern Poland were characterized in this study. Water samples collected from seven lakes in August and September 2005 were analysed by high performance liquid chromatography (HPLC), enzyme linked immunosorbent assay (ELISA) and protein phosphatase inhibition assay (PPIA). Cyanobacterial toxins present in field samples and in an isolated strain of Planktothrix agardhii were also characterized by liquid chromatography electrospray ionization tandem mass spectrometry (LC-ESI-MS/MS). In most of the fresh water samples MC-LR, MC-RR and MC-3 Corresponding author.

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Section: Nodularins In the Coastal Waters Of The Gulf Of Gdańskmentioning

confidence: 99%

Cyanobacterial hepatotoxins, microcystins and nodularins, in fresh and brackish waters of the Pomeranian Province, northern Poland

Mazur‐Marzec

Spoof

Kobos

et al. 2008

Oceanological and Hydrobiological Studies

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“…Although the processes occurring in the laboratory were likely also occurring in the field, the full-scale trial would have introduced further potential mechanisms for microcystins degradation, including the presence of UV radiation, which catalyses the production of hydroxyl and hydroperoxyl radicals from H 2 O 2 , resulting in a high degree of microcystins degradation in the hours following H 2 O 2 addition (Glaze et al, 1987). Microcystins can also be destroyed by UV radiation through isomerisation, and photosensitised transformation in the presence of humic substances and pigments (Song et al, 2007;Tsuji et al, 1994;Steinberg, 1999, 2000). In the full-scale trial, there would also have been a significantly higher loading of sediment than in the laboratory trials, where wastewater was collected from the surface of ponds.…”

Section: Microcystins Dynamicsmentioning

confidence: 99%

Cyanobacterial and microcystins dynamics following the application of hydrogen peroxide to waste stabilisation ponds

Barrington

Ghadouani

Ivey

2013

Hydrol. Earth Syst. Sci.

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Abstract. Cyanobacteria and cyanotoxins are a risk to human and ecological health, and a hindrance to biological wastewater treatment. This study investigated the use of hydrogen peroxide (H 2 O 2 ) for the removal of cyanobacteria and cyanotoxins from within waste stabilization ponds (WSPs). The daily dynamics of cyanobacteria and microcystins (commonly occurring cyanotoxins) were examined following the addition of H 2 O 2 to wastewater within both the laboratory and at the full scale within a maturation WSP, the final pond in a wastewater treatment plant. Hydrogen peroxide treatment at concentrations ≥ 0.1 mg H 2 O 2 µg −1 total phytoplankton chlorophyll a led to the lysis of cyanobacteria, in turn releasing intracellular microcystins to the dissolved state. In the full-scale trial, dissolved microcystins were then degraded to negligible concentrations by H 2 O 2 and environmental processes within five days. A shift in the phytoplankton assemblage towards beneficial Chlorophyta species was also observed within days of H 2 O 2 addition. However, within weeks, the Chlorophyta population was significantly reduced by the re-establishment of toxic cyanobacterial species. This re-establishment was likely due to the inflow of cyanobacteria from ponds earlier in the treatment train, suggesting that whilst H 2 O 2 may be a suitable short-term management technique, it must be coupled with control over inflows if it is to improve WSP performance in the longer term.

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“…Since 2002, new treatment steps have been implemented in this water treatment plant (ultrasonication after flocculation and disinfection with UV). The efficacy of the new treatment to remove cyanotoxins has not yet been tested, but final disinfection with UV could be a useful tool for destroying MCs (Tsuji et al, 1995).…”

Section: Sj Hoeger Et Al / Toxicology and Applied Pharmacology 203mentioning

confidence: 99%

Occurrence and elimination of cyanobacterial toxins in drinking water treatment plants

Hoeger

Hitzfeld

Dietrich

2005

Toxicology and Applied Pharmacology

195

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Toxin-producing cyanobacteria (blue-green algae) are abundant in surface waters used as drinking water resources. The toxicity of one group of these toxins, the microcystins, and their presence in surface waters used for drinking water production has prompted the World Health Organization (WHO) to publish a provisional guideline value of 1.0 Ag microcystin (MC)-LR/l drinking water. To verify the efficiency of two different water treatment systems with respect to reduction of cyanobacterial toxins, the concentrations of MC in water samples from surface waters and their associated water treatment plants in Switzerland and Germany were investigated. Toxin concentrations in samples from drinking water treatment plants ranged from below 1.0 Ag MC-LR equiv./l to more than 8.0 Ag/l in raw water and were distinctly below 1.0 Ag/l after treatment. In addition, data to the worldwide occurrence of cyanobacteria in raw and final water of water works and the corresponding guidelines for cyanobacterial toxins in drinking water worldwide are summarized. D

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Stability of microcystins from cyanobacteria—II. Effect of UV light on decomposition and isomerization

Cited by 183 publications

References 21 publications

Cyanobacterial hepatotoxins, microcystins and nodularins, in fresh and brackish waters of the Pomeranian Province, northern Poland

Cyanobacterial hepatotoxins, microcystins and nodularins, in fresh and brackish waters of the Pomeranian Province, northern Poland

Cyanobacterial and microcystins dynamics following the application of hydrogen peroxide to waste stabilisation ponds

Occurrence and elimination of cyanobacterial toxins in drinking water treatment plants

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