Antioxidant Capacity of “Mexican Arnica” Heterotheca inuloides Cass Natural Products and Some Derivatives: Their Anti-Inflammatory Evaluation and Effect on C. elegans Life Span

Table 1

Capacity to inhibit lipid peroxidation and to reduce the DPPH radical.

Compound	IC50 μM
	Lipid peroxidation	Reduction of DPPH
1	4.72 ± 0.11	>100
2	3.09 ± 0.19	30.66 ± 8.14
3	nd^*	nd
4	nd	nd
6	4.30 ± 0.27	13.11 ± 1.2
7	6.16 ± 0.06	>100
8	nd	nd
9	14.46 ± 0.61	6.97 ± 0.14
11	17.35 ± 1.40	nd
12	nd	—
13	1.82 ± 0.12	nd
14	>100	nd
15	>100	nd
16	>100	nd
17	3.67 ± 0.43	—
18	0.58 ± 0.008	nd
α-Tocopherol	6.78 ± 2.16	31.74 ± 1

^*Not determined: at the concentrations tested the activity of compounds was low.