FIBER COMPOSITION OF A NEGLECTED WHEAT SPECIES (TRITICUM DICOCCUM SCHUBLER) AS DETERMINED BY PYROLYSIS GAS CHROMATOGRAPHY MASS SPECTROMETRY

摘要

Two different emmer (Triticum dicoccum Schubler) landraces (spring and winter emmer) and durum wheat (Triticum durum Desf.) as a reference material were analyzed by pyrolysis/gas chromatography/mass spectrometry to characterize structural polymers present in kernel cell walls. A number of pyrolysis products which can be ascribed to lignin and polysaccharides were identified in the pyrograms. The comparison of p-hydroxyphenyl (H), guaiacyl (G), and syringyl (S) pyrolysis products, presumably derived from lignin, and polysaccharide markers in the three different samples showed significant differences which can be related to differences in the composition of structural polymers in spring and winter emmer and durum wheat. The relative yields of G-type and carbohydrate-derived pyrolysis products were significantly higher in durum wheat than in the emmer samples.