Derivative spectrophotometric methods^a

RPG

MTF

Mean^b ± SD

1.025 ± 0.0054

501.76 ± 0.0077

Recovery (%)

102.50

100.35

RSD (%)

0.77

0.96

HPLC method^a

RPG

MTF

Mean^b ± SD

1.01 ± 0.01

501.25 ± 0.28

Recovery (%)

101.00

100.25

RSD (%)

1.40

0.06