Free fatty acids composition of soap stock was determined by gas
chromatography with GC/FID Shimadzu chromatograph equipped
with capillary column EC 30-Wax (30 m 0.25 mm 25 mm) and
flame ionization detector. The sample was transmethylated with 2 M
KOH in methanol (Christie, 2003). The analysis was performed at
130 1С initial temperature (4 min retention time),