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Table 1 Chemical constituents in methanol extracts of rice husk

From: Inhibitory effect of purple rice husk extract on AFB1-induced micronucleus formation in rat liver through modulation of xenobiotic metabolizing enzymes

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
  1. Values expressed as mean ± SD of three independent replicate for spectrophotometric method and independent duplicate for HPLC method. ND not detected,
  2. GAE gallic acid equivalent, CE catechin equivalent
  3. *Significantly different from white rice husk (p < 0.05)