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

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Table 1

Effect of green and traditional extraction methods on physico-chemical properties of RSO.

Characteristics	Extraction methods

	Supercritical (CO₂)	Hydraulic-press	Screw-press	Solvent
Oil content (%)	8.75 ± 1.04^c	9.35 ± 1.13^c	12.17 ± 0.89^b	18.98 ± 1.54^a
Free Fatty Acid (as % oleic acid)	0.30 ± 0.05^c	0.61 ± 0.11^bc	0.71 ± 0.15^b	2.41 ± 0.37^a
Iodine Value (g/100 g)	97.76 ± 0.35^a	94.50 ± 1.24^b	93.62 ± 0.95^b	93.41 ± 1.35^b
Refractive Index	1.4504 ± 0.0001^b	1.4494 ± 0.0003^b	1.4500 ± 0.0002^b	1.4562 ± 0.0001^a
Specific Gravity(g/cm3)	0.895 ± 0.004^c	0.927 ± 0.01^b	0.911 ± 0.007^bc	0.951 ± 0.02^a
Peroxide value (mEq./kg)	1.01 ± 0.01^d	1.59 ± 0.27^c	2.14 ± 0.51^b	4.57 ± 0.46^a
Saponification value (mg/g)	191.04 ± 1.13^b	193.65 ± 2.50^a	193.91 ± 1.59^a	190.87 ± 3.47^b

The values were expressed as mean ± standard deviation of three determinations.

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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