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. Author manuscript; available in PMC: 2011 Nov 1.
Published in final edited form as: Analyst. 2010 Sep 13;135(11):2864–2870. doi: 10.1039/c0an00333f

Fig. 1.

Fig. 1

Feature profile of human plasma obtained by 10 min LC-FTMS analysis. Eluate was ionized by ESI in the positive ion mode. Data were visualized using R software as 3-dimensional projections representing m/z, elution time and ion signal intensity. A. Raw data. B. Cubed root transformation of data to enhance visualization of lower abundance peaks. C. Magnification of m/z 235-265 and RT 50-100 s to enhance visualization of individual peaks. The largest peak corresponded to the [13C2]-cystine which was spiked into the plasma prior to deproteination and the peak at 241.0311 corresponds to endogenous cystine. Other detected peaks include m/z 244.0789, 68 sec; m/z 248.9762, 82 sec; m/z 249.0609, 72 sec; m/z 250.9736, 82 sec; m/z 254.0258, 77 sec; m/z 259.0279, 71 sec.