Rapid Screening and Structural Characterization of Antioxidants from the Extract of Selaginella doederleinii Hieron with DPPH-UPLC-Q-TOF/MS Method

Table 2

Relative PAs of nine peaks after being reacted with different concentrations of DPPH.

Number	DPPH concentration	Relative PAs
		1	2	3	4	5	6	7	8	9
1	Unreacted control sample	100	100	100	100	100	100	100	100	100
2	Reacted with DPPH	73.2 ± 0.6	57.3 ± 1.5	67.7 ± 1.8	67.7 ± 1.1	72.4 ± 0.4	65.8 ± 0.9	78.1 ± 0.9	80.8 ± 1.4	84.3 ± 1.8
	(0.16 mM·L^−1)
3	Reacted with DPPH	34.5 ± 1.3	53.6 ± 0.7	42.7 ± 1.9	32.5 ± 1.7	32.3 ± 1.3	10.3 ± 0.4	36.5 ± 0.7	32.8 ± 1.0	36.9 ± 1.2
	(0.32 mM·L^−1)
4	Reacted with DPPH	14.6 ± 1.1	20.1 ± 1.4	11.4 ± 0.5	14.9 ± 1.6	10.7 ± 0.8	10.2 ± 1.5	12.1 ± 1.1	12.6 ± 0.6	13.2 ± 0.5
	(0.48 mM·L^−1)

Note: PAs stand for peak areas with the unit of mAU * S.