Comparison of proton magnetic resonance spectra of cell-wall mannans and galactomannans of selected yeasts with their chemical structures

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Abstract
Yeasts can often be identified with the aid of the distinctive proton magnetic resonance (p.m.r.) spectra of their cell-wall mannans or galactomannans. Some of the polysaccharides, such as the galactomannan of Torulopsisgropengiesseri and the mannan of Saccharomycesrouxii give p.m.r. spectra with only slight differences and have closely related chemical structures in terms of main chains and side chains. Other spectrally similar polysaccharides with related chemical structures have also been found. These are firstly the galactomannans of Trichosporonfermentans and Candidalipolytica and secondly the mannose-containing polysaccharides of Torulopsisbombi (Torulopsis species PRL 319-67), Torulopsis magnoliae and Torulopsisapicola (Hajsig strain). The mannans of Candidacatenulata and Endomycopsisfibuliger give p.m.r. spectra with a lesser degree of similarity, but have markedly different chemical structures. These results show that polysaccharides with similar p.m.r. spectra have related chemical structures and may therefore arise from phylogenetically related yeasts.

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