Table 2.
Total phenol, total flavonoid, total hydroxycinnamic acid, and proanthocyanidin content of Mexican Quercus species extracts obtained by hot water and maceration methods.
| Extract | Total Phenols (mg GAE/g) | Total Flavonoids (mg QE/g) | Hydroxycinnamic Acids (mg ChAE/g) | Proanthocyanidins (mg CChE/g) |
|---|---|---|---|---|
|
Q. crassifolia hot water |
747 ± 41 a | 25.4 ± 0.6 a | 235 ± 2 c | 25.7 ± 1.3 d * |
| Purified Q. crassifolia hot water |
860 ± 6 * | 43.6 ± 0.3 * | 362 ± 13 * | 9.4 ± 0.3 |
|
Q. crassifolia maceration |
695 ± 62 a | 14.0 ± 0.3 d | 269 ± 37 b | 53.5 ± 1.0 b |
|
Q. laurina hot water |
474 ± 44 b | 24.1 ± 1.1 b | 133 ± 4 e,f | 14.2 ± 0.4 e |
|
Q. laurina maceration |
756 ± 17 a | 15.7 ± 0.2 e | 145 ± 17 e,f | 24.3 ± 1.8 d |
|
Q. scytophylla hot water |
329 ± 38 c | 24.1 ± 0.5 b | 113 ± 3 e,f | 12.6 ± 2.3 e |
|
Q. scytophylla maceration |
521 ± 40 b | 12.9 ± 0.3 c | 173 ± 13 d,e | 48.4 ± 3.8 c |
| Oligopin® | 736 ± 20 a | 6.4 ± 0.2 f | 337 ± 28 a | 69.2 ± 0.8 a |
Means with different letters (a, b, c, d, e, f) in the same column are significantly different at p < 0.05 (ANOVA, followed by Duncan’s test). GAE, gallic acid equivalents; QE, quercetin equivalents; ChAE, chlorogenic acid equivalents; CChE, cyanidin chloride equivalents. Means with * in the same column are different at p < 0.05 (Student’s t-test, comparing crude and purified Q. crassifolia hot water extracts).