Evaluation of green extraction methods on the chemical and nutritional aspects of roselle seed (Hibiscus sabdariffa L.) oil | OCL

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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	55.11^a	75.23^c	69.41^bc	65.57^b
β-tocopherol	ND*	ND	ND	ND
γ-tocopherol	127.24^b	133.64^b	116.49^a	168.03^c
δ-tocopherol	107.43^d	25.14^a	29.33^bc	33.75^c

*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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