Simultaneous Determination of Four Ingredients in Plantago Depressa by Single Marker

Table 4

Relative correction factors.

Dilution ratio	Relative correction factor
	Protocatechuic acid	Catechin	Luteolin
1	1.204	0.8655	1.6158
2	1.1789	0.8342	1.5792
4	1.2062	0.8719	1.6203
5	1.2115	0.8803	1.6308
10	1.1923	0.8554	1.5831
20	1.2022	0.8602	1.6119
Mean	1.1992	0.8613	1.6069
RSD/%	0.98	1.84	1.30