Determination of free and total fatty acids with the help of the desorption-ionization mass spectrometry

The present disclosure relates to methods and devices for the determination of free and total fatty acidsin a sample. In particular, the present disclosure to the determination of free and total fatty acidsby means of desorption ionization mass spectrometry refers. The methods and devices can comprise either an ion source, or carried out after ionization fragmentation of the compounds containing the fatty acids.