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|Title:||Biodegradation of multiple cyanobacterial metabolites in drinking water supplies|
|Citation:||Chemosphere, 2012; 87(10):1149-1154|
|Publisher:||Pergamon-Elsevier Science Ltd|
|Lionel Ho, Tim Tang, Paul T. Monis, Daniel Hoefel|
|Abstract:||The fate of multiple cyanobacterial metabolites was assessed in two Australian source waters. The saxitoxins were the only metabolites shown to be non-biodegradable in Myponga Reservoir water, while microcystin-LR (MCLR) and geosmin were biodegradable in this water source. Likewise, cylindrospermopsin (CYN) was shown to be biodegradable in River Murray water. The order of ease of biodegradability followed the trend: MCLR>CYN>geosmin>saxitoxins. Biodegradation of the metabolites was affected by temperature and seasonal variations with more rapid degradation at 24°C and during autumn compared with 14°C and during winter. A microcystin-degrading bacterium was isolated and shown to degrade four microcystin variants within 4 h. This bacterium, designated as TT25, was shown to be 99% similar to a Sphingopyxis sp. based on a 16S rRNA gene fragment. Isolate TT25 was shown to contain a homologue of the mlrA gene; the sequence of which was 99% similar to that of a previously reported microcystin-degrader. Furthermore, isolate TT25 could degrade the microcystins in the presence of copper sulphate (0.5 mg L(-1) as Cu(2+)) which is advantageous for water authorities dosing such algicides into water bodies to control cyanobacterial blooms.|
|Keywords:||Biodegradation; Cyanobacteria; Cylindrospermopsin; Geosmin; Microcystins; Saxitoxins|
|Rights:||Copyright © 2012 Elsevier Ltd. Published by Elsevier Ltd. All rights reserved.|
|Appears in Collections:||Earth and Environmental Sciences publications|
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