LC-MS(SIM)      
Nominal conc. (ng/ml) 50 100 400
Matrix effect % (mean) 3.9 3.2 4.4
Precision (CV%)  3.7 1.8 3.1
LC-HRMS      
Nominal conc. (ng/ml) 50 100 400
Matrix effect % (mean) 2.8 1.7 3.9
Precision (CV%)  3.1 2.9 2.3
Table 2: Matrix effect data at three concentrations of captopril (n=5).
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