Table 3

Effect of extraction methods on tocopherols content of RSO by HPLC.

Tocopherol fractions content (mg/100 g oil) Extraction methods    

  Supercritical (CO2) Hydraulic-press Screw-press Solvent
α-tocopherol 55.11a 75.23c 69.41bc 65.57b
β-tocopherol ND* ND ND ND
γ-tocopherol 127.24b 133.64b 116.49a 168.03c
δ-tocopherol 107.43d 25.14a 29.33bc 33.75c

*ND = not detected

Values in the rows with different letters (a–d) are significantly different (p < 0.05). The same letters at the same column are not significant (p < 0.05).

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