HPLC-Fingerprints and Antioxidant Constituents of Phyla nodiflora

Table 2

Antioxidant and tyrosinase inhibitory activities of compounds 1–9 isolated from P. nodiflora ^a.

Samples	DPPH^•	ABTS^•+	O2^•−	Tyrosinase
	SC50^c (𝜇M)			IC50^d (𝜇M)
1	—^e	—^e	—^e	—^e
2	198.2 ± 3.8	62.2 ± 2.5	42.3 ± 1.5	127.6 ± 1.3
3	>300	>300	59.9 ± 2.1	169.9 ± 3.8
4	24.7 ± 1.2	53.7 ± 3.9	23.5 ± 0.5	65.8 ± 3.2
5	21.8 ± 1.2	58.4 ± 2.7	10.7 ± 1.3	121.8 ± 4.8
6	>300	>300	34.6 ± 2.4	152.8 ± 4.4
7	24.1 ± 0.4	30.5 ± 1.2	8.3 ± 0.4	56.0 ± 5.0
8	57.5 ± 2.7	55.3 ± 3.8		146.0 ± 2.2
9	—^e	—^e	—^e	—^e
Apigenin^b,+	>300	159.6 ± 4.4	81.3 ± 2.0	304.8 ± 3.1
Vit. C^b	64.6 ± 4.4	49.9 ± 2.1	23.5 ± 1.7	—^e
Kojic acid^b	—^e	—^e	—^e	88.1 ± 1.8

aValues are presented as means ± SD (𝑛=3). ^bApigenin, Vit. C, and Kojic acid are used as positive controls. ⁺The data of apigenin are referred to previous report (Lan et al. 2013) [15]. ^cSC₅₀ is the concentration of test samples that scavenges 50% radicals. ^dIC₅₀ is the concentration of test samples that inhibits 50% tyrosinase. ^eNot tested.