An Isocratic Method for Quantification of Valproic Acid and Its Related Impurities Using Ion Pair Reagent by Ultraperformance Liquid Chromatography

Table 1

Data for method precision.

Area
Injection	PA	2-EPA	2-IsoPPA	VPA
SET 01	224100	663931.5	672628.5	850128.5
SET 02	212925.5	631144	639404.5	821765
SET 03	213801	633675.5	641733.5	823815.5
SET 04	214931.5	635104	643164.5	824633
SET 05	218389.5	649573	654524	838073
SET 06	218432.5	642225.5	642627.5	830001
Mean	217096.7	642608.9	649013.8	831402.7
Std dev	4134.018	12416.7	12715.01	10893.97
% CV	1.904229	1.932233	1.959127	1.310312