Effect of Different Extraction Methods on Quality Characteristics of Rapeseed and Flaxseed Oils

Table 1

Physicochemical properties of rapeseed and flaxseed oils.

Oil sample	Extraction	Pretreatment	Acid value (mg KOH/g)	Peroxide value (meq O2/kg)	Saponification value (mg/g)	Moisture and volatiles (%)
Rapeseed oil	Screw press	Hot	0.70 ± 0.04^cA	1.16 ± 0.00^bA	194.25 ± 2.04^cB	0.05 ± 0.00^cB
		Cold	0.56 ± 0.00^dB	0.63 ± 0.04^dB	195.87 ± 0.75^bA	0.09 ± 0.02^bA
	Hydraulic press	Hot	0.51 ± 0.01^eB	0.52 ± 0.01^eA	179.88 ± 1.72^dB	0.03 ± 0.00^cB
		Cold	0.52 ± 0.06^eA	0.46 ± 0.03^fB	199.88 ± 1.11^aA	0.10 ± 0.00^bA
	Soxhlet extraction	Hot	3.36 ± 0.18^aA	0.70 ± 0.01^cB	173.21 ± 1.69^fB	1.54 ± 0.01^aA
		Cold	1.38 ± 0.18^bB	1.45 ± 0.07^aA	178.60 ± 1.17^eA	0.06 ± 0.01^dB
Flaxseed oil	Screw press	Hot	1.01 ± 0.00^cB	0.30 ± 0.00^dB	183.23 ± 0.25^cB	0.10 ± 0.03^cB
		Cold	1.59 ± 0.07^aA	0.85 ± 0.04^cA	197.51 ± 0.06^abA	0.15 ± 0.01^cA
	Hydraulic press	Hot	0.95 ± 0.01^cA	2.31 ± 0.01^bA	183.26 ± 0.04^cB	0.06 ± 0.00^cB
		Cold	0.82 ± 0.03^dB	0.22 ± 0.02^dB	199.43 ± 0.63^aA	0.14 ± 0.00^cA
	Soxhlet extraction	Hot	1.23 ± 0.06^bA	5.23 ± 0.25^aA	185.16 ± 0.36^cB	1.05 ± 0.04^aA
		Cold	0.93 ± 0.03^cB	0.75 ± 0.01^cB	195.28 ± 0.21^bA	0.92 ± 0.14^bB

Note. Different letters in the same column represent significant differences ().