Table 3.
Experimental and predicted DPPH radical scavenging activities.
| Compounds | (1) Experimental Radical Scavenging Activity | Predicted Radical Scavenging Activity | |
|---|---|---|---|
| PM6 | PM7 | ||
| cyanidin | 33 | 35.3 | 33.2 |
| delphinidin | 42 | 42.6 | 41.0 |
| malvidin | 24 | 26.6 | 26.1 |
| pelargonidin | 31 | 28.3 | 27.6 |
| peonidin | 33 | 31.4 | 29.3 |
| cyanidin-3-coumaroylsambubiose-5-galactoside | 26 | 22.4 | 25.2 |
| cyanidin-3,5-diglucoside | 21 | 22.6 | 20.9 |
| cyanidin-3-arabinoside | 26 | 28.5 | 27.3 |
| cyanidin-3-sambubiose-5-galactoside | 22 | 22.1 | 21.5 |
| cyanidin-3-galactoside | 25 | 30.3 | 30.2 |
| cyanidin-3-glucoside | 32 | 31.1 | 28.8 |
| cyanidin-3-rutinoside | 25 | 27.0 | 27.5 |
| delphinidin-3-glucoside | 42 | 35.4 | 38.1 |
| delphinidin-3-rutinoside | 32 | 33.4 | 30.4 |
| malvidin-3,5-diglucoside | 14 | 16.6 | 14.9 |
| malvidin-3-galactoside | 22 | 22.9 | 21.3 |
| malvidin-3-glucoside | 26 | 22.6 | 21.2 |
| pelargonidin-3-glucoside | 20 | 21.0 | 21.2 |
| peonidin-3-galactoside | 20 | 22.2 | 21.1 |
| peonidin-3-glucoside | 26 | 23.6 | 23.5 |
| petunidin-3-glucoside | 23 | 28.0 | 25.7 |
| (2) Mean absolute error | 2.43 ± 0.35 | 2.06 ± 0.32 | |
| (2) Q-square | 0.82 ± 0.08 | 0.86 ± 0.08 | |
(1) Experimental radical scavenging activity data was adapted from a previous study by Kähkönen and Heinonen (2003), percentage of scavenged DPPH radical; (2) Mean absolute error and Q-squre are resulted from bootstrap validation, presented as mean ± standard deviation.