Marketed formulation

Certified value (µg∙ml⁻¹)

Found value (µg∙ml⁻¹)

Relative error %

recovery

RSD

Gaptin^a

377.41

375.01

0.64

99.36

0.0055

Conventin^b

248.29

252.75

1.79

100.016

0.0082