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. Author manuscript; available in PMC: 2021 May 30.
Published in final edited form as: Anal Chem. 2019 May 14;91(11):7373–7378. doi: 10.1021/acs.analchem.9b01235

Figure 4.

Figure 4.

Comparison of the results of ratio analysis and correlation analysis of either extracted urine or intact urine spectra using the driving peak as indicated by asterisk (*). The spectra shown are (a) E-RANSY; (b) RANSY; (c) E-STOCSY, (d) STOCSY and (e) the intact urine 1D 1H NMR spectrum. The inset shows the structure of 2-furoylglycine identified based on E-RANSY. Peaks in the E-RANSY spectrum are labeled with corresponding protons as labeled in the structure of the metabolite. For RANSY and STOCSY, intact urine NMR spectra were used; for E-RANSY and E-STOCSY, ethyl acetate extracted urine NMR spectra were used.