Lisinopril

Enalapril

Captopril

Fosinopril
Conc. RSD Rec Rec. Conc. RSD Rec Rec. Conc. RSD Rec. Rec. Conc. RSD Rec. Rec. Conc.
5 0.77 99.6 4.98 0.9 101.76 5.35 0.94 100.54 5.22 0.94 100.5 40.22
10 0.07 101.47 10.15 0.79 100.2 10.1 0.6 100.37 10.3 0.6 100.4 80.3
15 0.8 99.95 14.99 0.02 100.87 15.5 0.46 100.06 15.07 0.46 100.1 120.1
20 0.65 99.85 19.97 0.75 100.11 20.1 0.12 100.43 20.69 0.12 100.4 160.7
25 0.18 100.07 25.01 0.7 100.09 25.1 0.09 100.11 25.21 0.09 100.1 200.2
50 0.11 100.02 50.01 0.22 99.98 50 0.14 99.97 50.9 0.14 99.97 399.9

Spiking (Bulk material -- % level)
80 0.12 99.95 8 0.37 99.92 7.99 0.12 99.95 8 0.25 100.2 8.01
100 0.22 100.06 10.01 0.16 99.9 9.99 0.22 100.06 10 0.12 99.95 10
120 0.36 99.69 11.96 0.09 99.92 12 0.36 99.69 12 0.06 99.88 11.99

Spiking (Serum -- % level)
80 0.13 100.02 8 0.34 100.05 8 0.37 99.92 7.99 0.25 100.2 8.01
100 0.15 100.17 10.02 0.13 99.87 9.99 0.16 99.9 9.99 0.12 99.95 10
120 0.332 100.11 12.01 0.09 99.94 12 0.09 99.92 11.99 0.06 99.88 11.99
Recovery (Rec.) and RSD in %; Concentration (Conc.) and Recovered Concentration (Rec. Conc.) in μgmL-1.
Table 3: Method accuracy from recovery assays for the studied analytes.