Research Article

Quantitative Measurement of Plasma Free Metanephrines by a Simple and Cost-Effective Microextraction Packed Sorbent with Porous Graphitic Carbon and Liquid Chromatography-Tandem Mass Spectrometry

Figure 1

Typical MRM chromatograms of plasma free NMN and MN obtained in a patient without PPGL (a) and a patient with histologically confirmed PPGL (b).
(a)
(b)