Figure 1: CH4 formation from different methyl substituted substrates.
From: Abiotic methanogenesis from organosulphur compounds under ambient conditions
Among methylated substrates used are (a) S-adenosylmethionine (SAM), L-methionine (MET), methionine sulphoxide (MSO) and methionine sulphone (MSO2); (b) 2-(methylthio)ethanol (MSEt), dimethylsulphoniopropionate (DMSP), dimethyl sulphoxide (DMSO), methyl phenyl sulphide (MPS) and methyl phenyl sulphoxide (MPSO); and (c) choline chloride (CC), betaine (BET), N,N-dimethylaniline (DMA), guaiacol (GU) and leucine (LEU). Values show molar conversion of methyl substituted substrates as percentages. The initial amounts of reactants were 50 μmol ASC, 4 μmol FH, 100 μmol H2O2 and 0.5 μmol methylated substrates (0.025 μmol DMSO) in 1 ml total volume (H2O), and headspace 360 ml, ambient temperature and ambient atmosphere. Data show mean value±s.d. (n=3); reaction time of 30 h. The pH in the medium was in the range of 2.9–3.1.
