13C-nuclear magnetic resonance spectra of compounds containing β-D-fructofuranosyl groups or residues

摘要: Abstract 13 C-N.m.r. spectra have been recorded for sucrose, melezitose, levan, inulin, palatinose, and D -fructose. Except the last, each compound contains a different O -substituted -fructofuranose residue or group, β- -fructofuranosyl group. On basis of chemical-shift displacements, resulting from -substitution at specific carbon atoms, resonances can be assigned to atoms residue. Fortuitously, α- -glucopyranosyl group present in some these compounds exhibits that do not obscure resonances. -Substitution causes downfield displacement corresponding, linked-C resonance; however, other major this are affected by bulky substituents. Members series levan fractions, products partial, acid hydrolysis Streptoccoccus salivarius were then examined changes relative degree branching.