. Author manuscript; available in PMC: 2018 Jan 1.

Published in final edited form as: J Am Soc Mass Spectrom. 2016 Sep 21;28(1):136–144. doi: 10.1007/s13361-016-1501-2

Table 2.

Normalization to the RPT internal standard improves accuracy in RIF quantification (n=5). Relative error was calculated using 1/x² weighted linear regression. QC accuracy is reported as the average of the 5 trials using the difference from 100% of the absolute value of the percent error.

Concentration (μM)	Raw Relative Error (%)	Ratio Relative Error (%)
3.00	29.0	10.8
7.00	19.2	17.8
10.0	18.3	10.6
30.0	0.8	1.3
70.0	8.3	2.0
100.0	10.9	6.8

Concentration (μM)	Raw Accuracy (%)	Ratio Accuracy (%)
50.0	87.7	95.5