Simultaneous Determination of Four Ingredients in Plantago Depressa by Single Marker

Table 6

Effects of the different chromatographic columns on the relative correction factor.

Chromatographic columns	Relative correction factor
	Protocatechuic acid	Catechin	Luteolin
Agilent ZORBAX SB-C18	1.2035	0.8673	1.6139
Phenomenex C18	1.2041	0.8655	1.6158
Agilent TC-C18	1.1962	0.8542	1.5902
Mean	1.2097	0.8677	1.6089
RSD/%	1.19	1.65	1.45