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Identification of volatiles from six marine strains. | LitMetric
The volatiles emitted from six marine species of the genus were investigated by GC-MS. Besides several known compounds including dimethyl trisulfide and -methyl methanethiosulfonate, the sulfur-containing compounds ethyl ()-3-(methylsulfanyl)acrylate and 2-(methyldisulfanyl)benzothiazole were identified and their structures were verified by synthesis. Feeding experiments with [-H]methionine, [-C]methionine and [S]-3-(dimethylsulfonio)propanoate (DMSP) resulted in the high incorporation into dimethyl trisulfide and -methyl methanethiosulfonate, and revealed the origin of the methylsulfanyl group of 2-(methyldisulfanyl)benzothiazole from methionine or DMSP, while the biosynthetic origin of the benzothiazol-2-ylsulfanyl portion could not be traced. The heterocyclic moiety of this compound is likely of anthropogenic origin, because 2-mercaptobenzothiazole is used in the sulfur vulcanization of rubber. Also in none of the feeding experiments incorporation into ethyl ()-3-(methylsulfanyl)acrylate could be observed, questioning its bacterial origin. Our results demonstrate that the strains are capable of methionine and DMSP degradation to widespread sulfur volatiles, but the analysis of trace compounds in natural samples must be taken with care.
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