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. Author manuscript; available in PMC: 2019 Sep 26.
Published in final edited form as: Anal Bioanal Chem. 2019 Jul 6;411(23):5937–5949. doi: 10.1007/s00216-019-01997-7

Fig. 3.

Fig. 3

MS/MS spectra of PC 16:1/18:2 in a positive ion mode and b negative ion mode. m/z 184.0733 in a shows the signature ion of PC, which also confirmed the accuracy of mixed-mode LC fractionation, while m/z 253.2172 and 279.2329 in b reflect the composition of the two fatty acyl chains and the sn-position assignment