The presence of an alpha linolenic acid, beta, gamma three crystal. Natural alpha linolenic acid, is tasteless, colorless to light yellow oily liquid. Soluble in ethanol and ethyl ether, insoluble in water. Mp-10--11.3 C, 224.5 C Lp /1.3kPa, the relative density is 0.9157g/cm3, the refractive index is 1.4800. Under the action of selenium, can be converted into trans isomer - acid 9- anti 1inolenelaidic anti 12- anti [28290-79-1] anti 15- eighteen carbon three acid MP, 29-30 C, insoluble in water and soluble in general organic solvents.