Phytochemicals (per gram extract) | White rice husk | Purple rice husk |
---|---|---|
Spectrophotometric method | ||
 Total phenolic compounds (mg GAE) | 37.92 ± 3.35 | 108.55 ± 14.44* |
 Total flavonoids (mg CE) | 14.76 ± 1.05 | 46.55 ± 3.27* |
HPLC method | ||
 Protocatechuic acid (mg) | ND | 3.46 ± 0.00* |
 Vanillic acid (mg) | 1.36 ± 0.20 | 6.25 ± 0.01* |
 p-Coumaric acid (mg) | 3.70 ± 0.04 | 3.93 ± 0.00* |
 Epicatechin (mg) | 8.25 ± 0.04 | 6.10 ± 0.03* |
 Apigenin (mg) | ND | 0.82 ± 0.00* |
 Cyanidin-3-glucoside (mg) | ND | 1.96 ± 0.00* |
 Peonidin-3-glucoside (mg) | ND | 1.15 ± 0.01* |
 Total γ-oryzanol (mg) | 4.87 ± 0.13 | 2.66 ± 0.07* |
 Total vitamin E (μg) | 138.03 ± 2.08 | 317.99 ± 2.54* |
 α – tocopherol (μg) | 10.69 ± 0.30 | 61.97 ± 0.21* |
 β – tocopherol (μg) | 27.13 ± 0.15 | 23.71 ± 0.22* |
 γ – tocopherol (μg) | 19.68 ± 0.29 | 77.81 ± 0.88* |
 δ – tocopherol (μg) | ND | 24.09 ± 0.12* |
 α – tocotrienol (μg) | ND | 14.55 ± 0.04* |
 γ – tocotrienol (μg) | 80.54 ± 2.21 | 115.86 ± 2.22* |
 δ – tocotrienol (μg) | ND | ND |