Figure 5.

Mass spectra of trimethylsiloxyl esters of peaksin H. perforatum extracts identified as 3-hydroxy lauric acid (a), 3-hydroxy palmitic acid (b), and 3-hydroxy myristic acid (c). The following ions indicate how to interpret these spectra: 1) the molecular ion (M+-1) is marked with an asterisk; 2) the abundant fragment at m/z = (M+-1)-15 is due to the fragmentation of the omega-methyl group; 3) the fragment ion at m/z = (M+-1)-57 is due to the left-most fragmentation indicated in each structure; and 4) the common fragment ion at m/z = 233 is due to the right-most fragmentation indicated in each structure.

Maury et al. Virology Journal 2009 6:101   doi:10.1186/1743-422X-6-101
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