Abstract
A rapid and simple technique was developed to identify free fatty acids in mixtures by the surface-assisted laser desorption/ionization time-of-flight mass spectrometry (SALDI-TOF MS) using powdered carbon aerogels as a “matrix”. A 3% solution of a neutral surfactant Triton X-100 was used as a fixing agent of carbon particles as well as a suppressor of background peaks. The extraction of free fatty acids from Brassica napus (rape) and Brassica rapa (turnip) seeds was performed by using both methanol-chloroform mixture and supercritical fluid extraction techniques. The quantitative analysis of the seed composition was carried out to demonstrate the effectiveness of the developed method. The detection limits were determined using a mixture of ten standard fatty acids and were found to be 3 ng of each acid per spot.
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