The Involvement of Phycocyanin Pigment in the Photodecomposition of the Cyanobacterial Toxin, Microcystin-LR

Peter K J Robertson*, Linda A. Lawton, Benjamin J P A Cornish

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

While investigating the destruction of the cyanobacterial hepatotoxin microcystin-LR in the presence of phycocyanin pigment via semiconductor photocatalysis, it became apparent that the pigment was catalysing the toxin decomposition. The mechanism of this process in terms of phycocyanin acting as a photo-oxygenation sensitizer via singlet oxygen and superoxide attack is explored. The absorption and fluorescence spectra of phycocyanin have been obtained and data on the properties of the excited state calculated. The established photo-oxygenation sensitizer rose bengal was also used as a catalyst for the photolytic decomposition of microcystin-LR to help elucidate the decomposition mechanism. 

Original languageEnglish
Pages (from-to)544-551
Number of pages8
JournalJournal of Porphyrins and Phthalocyanines
Volume3
Issue number7
DOIs
Publication statusPublished - Oct 1999
Event2nd International Symposium on Phthalocyanines - Edinburgh, United Kingdom
Duration: 01 Sep 1998 → …

Keywords

  • Cyanobacteria
  • Photo-oxygenation
  • Photocatalysis
  • Singlet oxygen

ASJC Scopus subject areas

  • Chemistry(all)

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