Table 3.
Antioxidant activity, total polyphenols and total flavonoids contents of special and conventional beers.
| Beer Code | Total Polyphenols Gallic acid Eq. mg/L |
Total Flavonoids Catechin Eq. mg/L |
FRAP Fe2SO4 Eq. mM |
ABTS Trolox Eq. mM |
|---|---|---|---|---|
| Special Beers: | ||||
| WALN | 964.7 ± 9.6 a | 90.1 ± 1.8 a | 10.2 ± 0.02 a | 5.2 ± 0.05 a |
| CHES | 883.4 ± 10.9 b | 71.7 ± 0.9 b | 6.2 ± 0.08 b | 3.4 ± 0.03 b |
| GTEA | 464.4 ± 3.9 f | 42.0 ± 0.3 e | 3.6 ± 0.05 d | 2.4 ± 0.03 e |
| COFF | 582.7 ± 6.4 d | 69.5 ± 1.0 b | 5.0 ± 0.14 e | 2.9 ± 0.03 f |
| COCO | 1026.4 ± 3.0 a | 96.4 ± 2.0 c | 8.1 ± 0.10 c | 3.9 ± 0.04 c |
| HONE | 538.3 ± 8.3 e | 48.7 ± 1.0 f | 3.9 ± 0.01 f | 2.5 ± 0.03 d |
| LIQU | 819.7 ± 6.9 c | 81.4 ± 1.3 d | 6.1 ± 0.04 b | 3.4 ± 0.01 b |
| Conventional Beers: | ||||
| Ale 1 | 446.1 ± 12.6 f,i | 51.9 ± 1.1 g | 3.7 ± 0.17 d,f,h | 1.7 ± 0.03 g,h |
| Ale 2 | 382.7 ± 6.6 l | 59.0 ± 0.9 h | 3.4 ± 0.04 h | 1.5 ± 0.02 i |
| Ale 3 | 424.4 ± 8.7 g,f | 51.9 ± 1.3 f,g | 3.9 ± 0.01 f | 2.6 ± 0.02 d |
| LAGE 1 | 273.8 ± 4.1 h | 26.6 ± 0.1 l | 1.7 ± 0.02 g | 1.8 ± 0.03 g |
| LAGE 2 | 320.6 ± 8.6 m | 63.5 ± 0.8 i | 2.8 ± 0.04 i | 1.5 ± 0.06 h,i |
FRAP, ferric reducing antioxidant power assay; ABTS, 2,2′-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) assay. Values are means ± SE (polyphenols content, n = 5; flavonoids content, n = 6; FRAP and ABTS, n = 3). Within each column, values with different superscript are significantly different (p < 0.05, one-way ANOVA, Fisher method).