Degradation of natural toxins by phthalocyanines--example of cyanobacterial toxin, microcystin

Phthalocyanines (Pcs) are promising photosensitizers for use in various branches of science and industry. In the presence of visible light and diatomic oxygen, phthalocyanines can react to produce singlet oxygen, a member of reactive oxygen species able to damage different molecules and tissues. The...

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Bibliographic Details
Published in:Water science and technology 2010-01, Vol.62 (2), p.273-278
Main Authors: Jancula, Daniel, Bláhová, Lucie, Karásková, Marie, Marsálek, Blahoslav
Format: Article
Language:English
Subjects:
Degradation
Enzyme Inhibitors - chemistry
Enzyme-Linked Immunosorbent Assay
Hydrogen peroxide
Incubation period
Indoles - chemistry
Light
Light sources
Microcystin-LR
Microcystins
Microcystins - chemistry
Oxidants
Oxidants - chemistry
Oxidizing agents
Oxygen
Ozone
Reactive oxygen species
Singlet Oxygen
Tissue
Toxins
Water Pollutants, Chemical - chemistry
Water Pollution, Chemical - prevention & control
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Summary:Phthalocyanines (Pcs) are promising photosensitizers for use in various branches of science and industry. In the presence of visible light and diatomic oxygen, phthalocyanines can react to produce singlet oxygen, a member of reactive oxygen species able to damage different molecules and tissues. The aim of this study was to investigate the ability of phthalocyanines to degrade natural toxins in the presence of visible light. As the representative of hardly degradable toxins, a group of cyanobacterial peptide toxins--microcystin-LR--was chosen for this study. According to our results, phthalocyanines are able to degrade 61.5% of microcystins within a 48-hour incubation (38% of microcystins was degraded after 24 h and 24% after 12 h of incubation). Although other oxidants like hydrogen peroxide or ozone are able to degrade microcystins within several hours, we assume that by optimizing the spectrum emitted by light source and by changing the absorption characteristics of Pcs, microcystins degradation by phthalocyanines could be more effective in the near future.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2010.306