Figure 5 | Scientific Reports

Figure 5

From: Positional determination of the carbon–carbon double bonds in unsaturated fatty acids mediated by solvent plasmatization using LC–MS

Figure 5

Mechanistic background of peroxide formation and fragmentation. (A) Mass spectra of the cyclic peroxide of cis-4 DTA. There was no mass increase in the cyclic peroxide with H218O; however, there was a mass increase by one unit and two units with D2O (asterisk) or by two units with H218O. (B) Diagnostic fragment ions of cis-4 DTA. The alpha fragments (i.e. m/z 195.14, 235.17, 73.03, and 57.03) show mass increase (asterisks) when D2O is used as the solvent, in contrast to the omega fragment (m/z 129.09) that does not show mass increase. When H218O was used there was mass increases in the omega fragment as well as in fragment c. The fragments with m/z 58.01, showing decrease in H218O, is a non-target fragment.

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