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. Author manuscript; available in PMC: 2012 Oct 15.
Published in final edited form as: Anal Chem. 2011 Sep 23;83(20):7616–7623. doi: 10.1021/ac201625f

Figure 2.

Figure 2

(a) 1H NMR spectrum of serum, obtained using the CPMG pulse sequence; (b) Selective detection of creatine by the RANSY method. The driving peak is at 3.02 ppm (indicated by the plus sign); (c) Selective detection of creatinine driven by the singlet at 3.03 ppm (indicated by the asterisk). The noise threshold value of R = 6 is indicated by the dashed horizontal line in both (b) and (c). The inset in (a) shows the two very closely spaced peaks for creatine and creatinine used as driving peaks.