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Fig. 4 | SpringerPlus

Fig. 4

From: Simultaneous quantification of salivary 3-hydroxybutyrate, 3-hydroxyisobutyrate, 3-hydroxy-3-methylbutyrate, and 2-hydroxybutyrate as possible markers of amino acid and fatty acid catabolic pathways by LC–ESI–MS/MS

Fig. 4

Typical P-ESI mass spectra (b, d) and product ion mass spectra (a, c) for 2PM-3HB (m/z 196) and 2PM-3HMB (m/z 210). The mass spectra of 2PM-3HIB and 2PM-2HB were almost the same as 2PM-3HB. The LC–MS/MS conditions are described in the “Methods”. P-ESI positive electrospray ionization, 2PM 2-pyridylmethyl. See legends of Figs. 1, 2, and 3 for other abbreviations

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