Table 1 Radical scavenging and antioxidant activities of phenols, enols and anilines
Entry | Compound | % DPPH inh. | Peroxyl inh. | % OH inh. | ksa | % AObactivity | % AOcactivity |
|---|---|---|---|---|---|---|---|
1 | Phenol | 2.3 | 0.0 | 0.4 | 0.83 | 0.0 | 0.0 |
2 | Catechol | 98.0 | 1.8 | 70.0 | 402.59 | 54.0 | 49.0 |
3 | Resorcinol | 2.5 | 0.8 | 5.1 | 9.40 | 4.0 | 5.0 |
4 | Hydroquinone | 97.0 | 2.1 | 67.0 | 360.50 | 54.0 | 47.0 |
5 | 2- Aminophenol | 92.0 | 1.49 | 63.1 | 307.42 | 46.0 | 40.0 |
6 | 3-Aminophenol | 20.2 | 0.7 | 7.3 | 13.82 | 7.0 | 2.0 |
7 | 4- Aminophenol | 97.0 | 1.4 | 65.0 | 333.41 | 44.0 | 40.0 |
8 | 3- Nitrophenol | 1.3 | 0.89 | 2.9 | 5.36 | 5.0 | 4.0 |
9 | 4- Nitrophenol | 1.1 | 0.0 | 5.6 | 10.51 | 5.0 | 6.0 |
10 | 3-Chlorophenol | 3.1 | 1.1 | Â | Â | Â | Â |
11 | 4- Chlorophenol | 3.6 | 0.81 | 1.7 | 3.04 | 0.0 | 0.0 |
12 | 4-Hydroxybenzaldehyde | 1.1 | 0.3 | 4.6 | 8.29 | 2.0 | 3.0 |
13 | 2-Hydroxyacetophenone | 0.0 | Â | Â | Â | Â | Â |
14 | Phenol-4-sulfonic acid | 0.3 | 0.9 | 3.4 | 6.08 | 1.0 | 1.0 |
15 | Salicylic acid | 1.3 | 0.9 | 8.9 | 17.14 | 1.0 | 2.0 |
16 | 3-Hydroxybenzoic acid | 2.5 | 0.0 | 6.9 | 12.72 | 4.0 | 3.0 |
17 | 4-Hydroxybenzoic acid | 1.8 | 0.56 | 2.5 | 4.48 | 3.0 | 1.0 |
18 | Ethyl salicylate | 1.2 | 0.81 | Â | Â | Â | Â |
19 | Methyl salicylate | 1.6 | 0.77 | Â | Â | Â | Â |
20 | Ethyl 4-hydroxybenzoate | 1.9 | 0.47 | Â | Â | Â | Â |
21 | 3,5-Dinitrosalicylic acid | 0.8 | 0.0 | 4.3 | 7.19 | 0.0 | 1.0 |
22 | 3,4-Dihydroxybenzoic | 89.6 | 2.41 | 35.4 | 93.44 | 57.0 | 51.0 |
23 | 2,5-Dihydroxybenzoic | 95.0 | 2.62 | 49.0 | 88.47 | 63.0 | 60.0 |
24 | Ethyl 2,5-dihydroxybenzoate | 96.1 | 2.5 | Â | Â | Â | Â |
25 | o-cresol | 12.2 | 0.62 | Â | Â | Â | Â |
26 | p- Cresol | 15.5 | 0.52 | Â | Â | Â | Â |
27 | Thymol | 35.0 | Â | Â | Â | Â | Â |
28 | Carvacrol | 33.9 | Â | Â | Â | Â | Â |
29 | Butylatedhydroxytoluene (BHT) | 96.0 | 2.98 | 95.0 | 361.61 | 66.0 | 59.0 |
30 | α-Tocopherol | 96.2 |  | 68.8 | 373.77 | 47.0 | 45.0 |
31 | Eugenol | 98.1 | Â | 97.0 | 389.81 | 63.0 | 60.0 |
32 | Guaiacol(o-methoxyphenol) | 28.3 | Â | Â | Â | Â | Â |
33 | Vanillic acid | 25.1 | 0.8 | 2.7 | 5.03 | 2.1 | 2.3 |
34 | Syringic acid | 90.4 | 2.9 | 62.2 | 283.09 | 58.0 | 52.0 |
35 | Gallic acid | 92.0 | 3.09 | 65.0 | 331.20 | 61.0 | 59.0 |
36 | Caffeic acid | 91.2 | 2.78 | 53.5 | 196.29 | 62.0 | 57.0 |
37 | Ascorbic acid | 99.1 | 2.94 | 81.0 | 361.61 | 46.0 | 49.0 |
38 | 4- hydroxycoumarin | 1.5 | Â | 2.4 | 3.59 | 0.0 | 0.0 |
39 | 1-Naphthol | 35.0 | 1.23 | Â | Â | Â | Â |
40 | Aniline | 8.7 | Â | 8.6 | 16.59 | 2.0 | 6.0 |
41 | p-Tuluidine | 18.4 | Â | Â | Â | Â | Â |
42 | p-Anisidine | 31.1 | Â | 4.9 | 8.85 | 6.0 | 3.0 |
43 | p-Phenylenediamine | 90.1 | Â | 66.0 | 347.78 | 43.0 | 49.0 |
44 | o-Phenylenediamine | 5.1 | Â | 2.8 | 5.032 | 3.0 | 1.0 |
45 | 2,3-Diaminophethaline | 2.9 | Â | 5.5 | 9.95 | 5.0 | 4.0 |
46 | Anthranillic acid | 5.7 | Â | Â | Â | Â | Â |
47 | p-Aminobenzoic acid | 4.6 | Â | Â | Â | Â | Â |
48 | m-Bromoaniline | 0.0 | Â | Â | Â | Â | Â |
49 | p-Chloroaniline | 0.0 | Â | Â | Â | Â | Â |
50 | o-Nitroaniline | 0.0 | Â | Â | Â | Â | Â |
51 | p-Nitroaniline | 0.0 | Â | Â | Â | Â | Â |