samples of seed oil of prickly lettuce ( lactuca sacriola oleifera ) which had been obtained by pressing or by extracting with acetone , ethyl ether , petroleum ether or carbon tetrachloride were analysed for the following parameters : viscosity , saponification number , iodine number , thiocyanogen value , unsaponifiable matter , free fatty acids , peroxide number and fatty acid composition .
C0015688
free fatty acids
C0015684
fatty acid