| Abstract: | Examination of Matrix Isolated Fourier Transform Infrared Spectras of Volatile Free Fatty Acids IR-spetroscopy in organic analytic is a well known method for the determination of functional groups and the identification of organic molecules. Sensitivity is especially high, when polar compounds are investigated. One of the few exceptions are the fatty acids. Due to the dimerisation of the carboxyclic group, part of the interesting range of the spectrum is covered by this dimer band. Moreover, the interpretable part of the spectrum is only of moderate resolution. By using GC-MI-FTIR, low temperature IR-Spectra of the fatty acids are available in not yet known resolution. Among the various fatty acids there are a number of structure specific criteria, which allow a definite identification even in trace levels, without previous derivatisation. |
