. Author manuscript; available in PMC: 2015 Dec 30.

Published in final edited form as: Rapid Commun Mass Spectrom. 2014 Dec 30;28(24):2681–2689. doi: 10.1002/rcm.7063

Table 4.

Comparison of phosphorylation quantification by DRIP-Q method and isotope dilution method

fraction (m)^a	DRIP-Q method	Isotope dilution method	p value^b
0.3	0.291 ± 0.018	0.295 ± 0.005	0.58
0.4	0.394 ± 0.017	0.391 ± 0.005	0.63

mixtures of AAAAYRAAR/AAAApYRAAR with phosphopeptide fraction (0.3, 0.4) in an amount range of 0.9– 2.0 pmol

t-test (two tails, n=5)