Production of the taste/odor-causing compound,trans-2,cis-6-nonadienal,within the Synurophyceae |
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Authors: | James L Wee Susan A Harris James P Smith Christopher P Dionigi David F Millie |
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Institution: | (1) Department of Biological Sciences, Loyola University, 6363 St. Charles Avenue, New Orleans, Louisiana 70118, USA;(2) Southern Regional Research Center, Agricultural Research Service, United States Department of Agriculture, 1100 Robert E. Lee Blvd., P.O. Box 19687, New Orleans, Louisiana 70179, USA |
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Abstract: | Although several species of the Synurophyceae have been associated with taste and odor problems in potable water supplies, electron microscopic-based field studies linked problematic blooms only toSynura petersenii Korshikov. Eventually, the organic compoundtrans-2,cis-6-nonadienal was implicated to cause the associated cucumberlike odors. The objective of this study was to survey unialgal cultures of various Synurophycean species for the occurrence oftrans-2,cis-6-nonadienal. The compound was detected throughout a 24-day growth assay with aS. petersenii isolate, but was not detected in an identical assay withSynura sphagnicola (Korshikov) Korshikov. In separate 24-day cultures,trans-2,cis-6-nonadienal was detected in two isolates from theS. petersenii species complex, but was not detected in isolates of twoMallomonas or fourSynura taxa not from theS. petersenii complex. These results support the hypothesis that production oftrans-2,cis-6-nonadienal is unique to taxa within theS. petersenii complex. When contrast-enhancing optics and specific specimen preparation techniques are employed, light microscopy can be used to distinguish taxa in theS. petersenii complex from all other Synurophycean taxa. These methods are suggested as an efficient way to monitortrans-2,cis-6-nonadienal-producing taxa in potable water supplies.Author for correspondence |
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Keywords: | Mallomonas Synura Synurophyceae trans-2 cis-6-nonadienal taste and odor compounds water quality |
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