Table 6.

Recovery of six analytes in the stem of Perilla frutescens (n = 3).^a

compound	content in Perilla stem (µg ml−1)	added (µg ml−1)	found (µg ml−1)	recovery (%)	RSD (%)
GSH	3.10 ± 0.11	2.0 ± 0.06	5.88 ± 0.18	115.3	3.2
		20.0 ± 0.54	19.16 ± 0.68	82.9	3.1
PC2	0	2.0 ± 0.07	2.11 ± 0.07	105.5	3.5
		20.0 ± 0.64	19.84 ± 0.58	99.2	3.2
PC3	11.30 ± 0.42	2.0 ± 0.06	14.55 ± 0.36	109.4	3.7
		20.0 ± 0.55	28.41 ± 0.71	90.8	2.1
PC4	23.48 ± 0.77	2.0 ± 0.06	23.6 ± 0.94	92.6	3.3
		20.0 ± 0.59	40.77 ± 1.28	93.8	2.8
PC5	0	2.0 ± 0.06	1.78 ± 0.06	89.0	2.9
		20.0 ± 0.42	18.54 ± 0.52	92.7	1.6
PC6	0	2.0 ± 0.05	2.14 ± 0.04	107.0	3.1
		20.0 ± 0.87	19.63 ± 0.88	98.2	3.4

^aChromatographic conditions are the same as in figure 1.