Nominal concentration

Intra-day n = 10

CV (%)

Bias (%)

Inter-day (n = 15)

CV (%)

Bias (%)

Mean measured concentration ± SD

Mean measured concentration ± SD

Piperacillin (228 nm)

30

29.68 ± 0.15

0.5

1.07

30.47 ± 1.22

4.00

1.57

50

48.93 ± 0.65

1.33

2.13

50.68 ± 2.41

4.75

1.36

200

189.88 ± 2.51

1.32

5.06

199.21 ± 12.45

6.25

0.4

400

384.86 ± 7.94

2.06

3.78

401.29 ± 23.1

5.76

0.32

Ciprofloxacin (280 nm)

0.5

0.46 ± 0.02

3.39

7.25

0.45 ± 0.02

4.25

9.27

1

0.93 ± 0.02

2.00

7.4

0.92 ± 0.02

2.52

8.18

4

4.01 ± 0.14

3.43

0.33

4.04 ± 0.13

3.31

0.99

8

8.03 ± 0.21

2.59

0.43

8.2 ± 0.32

3.86

2.47