Micellar LC Separation of Sesquiterpenic Acids and Their Determination in Valeriana officinalis L. Root and Extracts

Table 4

Intraday and inter-day precision data.

Analyte	Target concentration (100%), μg/mL	Inter-day variation*(%±R.S.D)	Inter-day variation (%±R.S.D)
Hydroxyvalerenic acid	1.90	101.3±1.1	101.7±1.8
	9.30	100.9±0.9	100.3±1.1
	27.9	99.9±0.7	100.2±0.9
Acetoxyvalerenic acid	4.20	100.7±0.5	100.2±1.1
	21.0	100.1±0.2	100.5±0.8
	63.0	99.8±0.3	100.1±0.5
Valerenic acid	6.10	99.5±0.9	100.2±1.4
	30.4	100.8±1.0	100.5±1.8
	91.2	100.3±0.5	100.9±1.1

*Mean value of the four determinations.