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. Author manuscript; available in PMC: 2008 Jun 15.
Published in final edited form as: Anal Biochem. 2007 Mar 25;365(2):283–285. doi: 10.1016/j.ab.2007.03.024

Figure 1.

Figure 1

(left) A. ESI spectrum of 2 μM α-casein. B. ESI spectrum of 2 μM α-casein with 20 μM PEG 4000. C. ESI spectrum of 2 μM α-casein with 20 μM PEG 4000 after TiO2 cleanup. (right) A. ESI spectrum of 2 μM cytochrome c. B. ESI spectrum of 2 μM cytochrome c with 20 μM PEG 4000. C. ESI spectrum of 2 μM cytochrome c with 20 μM PEG 4000 after TiO2 cleanup. Scalefactor is inverse proportion to intensity, and baseline noise is constant so that signal/noise is a valid measure of relative intensity.