Photochemical Reactions of Microcystin-LR Following Irradiation with UV Light
Open Access
- 1 January 2016
- journal article
- Published by Scientific Research Publishing, Inc. in Open Journal of Physical Chemistry
- Vol. 06 (04), 79-85
- https://doi.org/10.4236/ojpc.2016.64008
Abstract
Photochemical reactions of microcystin-LR, a toxic compound produced by some blue green algae, were investigated. Ultraviolet absorption of microcystin-LR was assessed. Time-dependent density functional theory (TDDFT) calculations indicated that absorption peak at 238 nm was mainly due to excitation of electrons from the linear chain structure Adda of microcystin-LR. Irradiation of microcystin-LR with UV light resulted in the reduction of the 238 nm absorption peak and the appearance of a new peak at 300 nm. Density functional theory (DFT) and TDDFT calculations with a model molecule suggested that this 300 nm peak was due to tricyclo-Adda microcystin-LR, an intermediate in photochemical reactions of microcystin-LR. Analysis of the rate of this photochemical reaction showed that it was a first order reaction.Keywords
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