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Solid phase micro-extraction (SPME) coupled with Gas Chromatography MassSpectrometry (GC-MS) was used to extract and analyse the volatiles in theheadspace above the plasmodial and sporulating stages of the slime mouldPhysarum Polycephalum. In total 115 compounds were identified from across abroad range of chemical classes. Although more (87) volatile organic compounds(VOCs) were identified when using a higher incubation temperature of 75oC, alarge number of compounds (79) were still identified at the lower extractiontemperature of 30oC and where the plasmodial stage was living. Far fewercompounds were extracted after sporulation at the two extraction temperatures.There were some marked differences between the VOCs identified in theplasmodial stage and after sporulation. In particular the nitrogen containingcompounds acetonitrile, pyrrole, 2, 5-dimethyl-pyrazine and trimethyl pyrazineseemed to be associated with the sporulating stage. There were many compoundsassociated predominantly with the plasmodial stage including a number of furansand alkanes. Interestingly, a number of known fungal metabolites wereidentified including 1-octen-3-ol, 3-octanone, 1-octen-3-one, 3-octanol. Inaddition known metabolites of cyanobacteria and actinobacteria in particulargeosmin was identified in the headspace. Volatile metabolites that hadpreviously been identified as having a positive chemotactic response to theplasmodial stage of P. polycephalum were also identified including{\beta}-farnesene, {\beta}-myrcene, limonene and 3-octanone. This studyconstitutes the first comprehensive analysis of the headspace volatiles emittedfrom Physarum Polycephalum. Further work to understand the origin and functionof the volatiles identified is required.

Analysis of the volatiles in the headspace above the plasmodium and sporangia of the slime mould (Physarum polycephalum) by SPME-GCMS