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. 2021 Mar 15;11(3):170. doi: 10.3390/metabo11030170

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Post-column infusion chromatogram of guanine (2*¹³C, ¹⁵N) with the relative intensity in % as compared to the injection of a solvent blank on the y-axis 100*(Intensity_{MCX or PPT}/Intensity_blank) − 100. Blue line = injection of blood plasma treated with PPT, red line = injection of blood plasma treated with SPE MCX. Each line is based on the average of 3 samples of each type, PPT, SPE MCX or a solvent blank. Major suppressions/enhancements are annotated in the chromatogram, PC = phosphatidylcholines, PS = phosphatidylserines, LysoPC = Lysophosphatidylcholines, K⁺ = potassium formate cluster K⁺(HCOOK), m/z 122.926, Na⁺ = sodium formate cluster Na⁺(HCOONa)₃), m/z 226.954, Cl⁻ = potassium chloride cluster, K⁺(KCl), m/z 112.8963.