Table II. Reproducibility evaluation based on selected peaks.

Peak No.a	RPLC				HILIC
	tR	m/z	S.D. tRb	RSDc	tR	m/z	S.D. tRb	RSDc
1	2.1	144.10	0.19	4.8%	20.3	144.10	0.21	11.4%
2	8.4	376.14	0.08	9.8%	\	\		\
3	9.0	288.28	0.13	16.7%	15.1	288.28	0.35	11.4%
4	10.8	286.19	0.23	5.2%	19.2	286.19	0.46	10.8%
5	12.8	314.23	0.41	10.6%	\	\	\	\
6	14.9	274.26	0.38	14.2%	\	\	\	\
7	\	\	\	\	2.5	284.28	0.31	9.8%
8	\	\	\	\	10.2	312.11	0.69	19.8%
9	\	\	\	\	17.9	407.77	0.33	8.4%

^a Peak No. refers to the corresponding peaks in Fig. 1.

^b S.D. t_R: standard deviation of retention times in six QC samples.

^c RSD: relative stand deviation of peak areas in six QC samples.