Table 2 Evaluation of accuracy for the determination of KET and OLO.

From: UV spectrophotometric methods for simultaneous determination of ketorolac tromethamine and olopatadine hydrochloride: Application of multiple standard addition for assay of ophthalmic solution

Drug (method)

Concentration taken (µg/mL)

Concentration found (µg/mL)

Mean concentration found*

(µg/mL)

% Recovery

Mean %recovery ± SD

KET (Direct at 323 nm)

4.0

4.06

3.97

4.02

4.02

100.39

100.48

 ± 

0.14

6.0

6.01

5.98

6.08

6.02

100.42

6.0

5.96

6.07

6.09

6.04

100.65

OLO (1DR)

40.0

40.22

40.31

39.59

40.04

100.10

99.79

 ± 

0.71

20.0

20.36

20.12

19.69

20.06

100.29

10.0

10.02

9.85

9.83

9.90

98.98

OLO (DWM)

40.0

40.11

40.17

39.26

39.85

99.62

100.19

 ± 

0.59

20.0

20.02

20.49

19.97

20.16

100.80

10.0

9.97

9.97

10.10

10.01

100.14

  1. *n = 3, S.D, standard deviation.