Rice bran | Black (RB218) | Red (RP511) | Brown (IR425) | ||||||
---|---|---|---|---|---|---|---|---|---|
Phenolic acids and flavonoids | Free | Bound | Total | Free | Bound | Total | Free | Bound | Total |
Protocatechuic acid | 6.18a ± 0.78 | ND | 6.18a ± 0.63 | 5.31b ± 0.74 | ND | 5.31b ± 0.67 | 2.87c ± 0.59 | ND | 2.87c ± 0.39 |
Syringic acid | 17.50c ± 1.20 | 6.90f ± 0.91 | 24.40a ± 1.59 | 15.25d ± 1.27 | 6.25f ± 0.57 | 21.50b ± 1.65 | 11.26e ± 0.72 | 3.16g ± 0.55 | 14.42d ± 1.15 |
Ferulic acid | 7.46f ± 0.88 | 20.58c ± 1.46 | 28.04a ± 1.80 | 5.27 g ± 0.86 | 18.56d ± 1.06 | 23.83b ± 1.89 | 3.51 h ± 0.73 | 14.28e ± 1.01 | 17.79d ± 1.37 |
Cinnamic acid | 19.98b ± 1.38 | 5.55e ± 0.69 | 25.53a ± 1.92 | 15.33c ± 1.19 | ND | 15.33c ± 1.09 | 9.61d ± 0.92 | ND | 9.61d ± 0.84 |
p-coumaric acid | 10.41d ± 1.04 | 22.94b ± 1.84 | 33.35a ± 2.06 | 6.18e ± 0.79 | 18.35c ± 1.11 | 24.53b ± 1.53 | 4.08e ± 0.58 | 12.63d ± 0.96 | 16.71c ± 1.18 |
Quercetin | 11.89b ± 0.98 | 3.66e ± 0.21 | 15.55a ± 1.20 | 8.10d ± 0.94 | 1.17g ± 0.24 | 9.27c ± 1.04 | 2.71f ± 0.66 | 0.16h ± 0.02 | 2.87f ± 0.36 |
Apigenin | 12.56b ± 1.47 | 2.75f ± 0.18 | 15.31a ± 1.07 | 5.508 ± 0.68 | 0.81g ± 0.09 | 6.39c ± 0.88 | 3.48e ± 0.61 | 0.74g ± 0.12 | 4.22d ± 0.44 |
Catechin | 15.64b ± 1.16 | 6.41f ± 0.80 | 22.05a ± 1.32 | 12.66c ± 0.92 | 3.24g ± 0.46 | 15.90b ± 1.02 | 7.27e ± 0.79 | 1.69h ± 0.25 | 8.96d ± 0.89 |
Luteolin | 10.72a ± 0.81 | ND | 10.72a ± 0.91 | 7.74b ± 0.81 | ND | 7.74b ± 0.82 | 2.35c ± 0.24 | ND | 2.35c ± 0.30 |
Myrecitin | 12.85a ± 1.15 | ND | 12.85a ± 0.88 | 12.82a ± 0.90 | ND | 12.82a ± 0.94 | 5.68b ± 0.38 | ND | 5.68b ± 0.72 |