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. Author manuscript; available in PMC: 2016 Mar 9.
Published in final edited form as: FEBS Lett. 2010 Oct 29;584(23):4761–4768. doi: 10.1016/j.febslet.2010.10.055

Fig. 3.

Fig. 3

Molecular identification of menaquinone biosynthesis in schizont stages of P. falciparum by positive ion ESI-MS and ESI-MS/MS. (A) ESI-MS and ESI-MS/MS analyses of the MQ-4 standard and unlabelled schizont parasites (1.0 × 1010) without standard co-injection, both previously purified by HPLC (Protocol I). The analysis of parasites sample shows the presence of the m/z+ 451.28 ion, coincident with the predicted molecular mass of MQ-4 standard. The molecular structure was confirmed by comparing the ESI-MS/MS spectra of the parental ions at m/z+ 451.28 from P. falciparum with the standard.