Gas chromatography (GC) is widely used in the analysis of FAs. Lipids extracted from plant or animal tissues are usually hydrolyzed using KOH solution in methanol or ethanol, and Fas released are then subjected to derivatization in order to increase their volatility and decrease polarity of their molecules. The most common FA derivatives for the GC analysis are their methylesters (FAMEs). There is a number of reactions used in the synthesis of FAMEs: the most common include the use of boron trifluoride inmethanol (BF3/MeOH), diazomethane and its safer alternative (tri-methylsilyl)diazomethane (TMSD). The solution of HCl or H2SO4inmethanol (HCl-MeOH, H2SO4-MeOH) is also widely used in ester-ification and transesterification of FAs from common lipid classes.However, little is known about the usefulness of certain procedures in the analysis of plant lipid samples. Recently, Alves et al. compared several hydrolysis/derivatization techniques in the analysis of FAs in herbage. They reported quite large differences in the amount of FAs determined, as well as in the amounts of interfering compounds. Most of the common methylation techniques have been used since the late 1950s . They differ in a mechanism of reaction, concentration of reagent used, optimal reaction time and possible interferences formed during derivatization [9,10].