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. Author manuscript; available in PMC: 2018 Nov 10.
Published in final edited form as: J Chromatogr A. 2017 Sep 9;1523:265–274. doi: 10.1016/j.chroma.2017.09.023

Figure 3. Comparison of quantitation after drift-correction versus internal standard normalization.

Figure 3

(a) Pearson's correlation coefficients between IS-normalized peak area and peak areas normalized by other strategies were calculated in Excel for metabolites with matching isotopic standards using all biological samples from the MMTT study. (b-g) Scatter plots illustrating correlation between IS-normalization and other strategies for a single representative metabolite, malic acid.