Determination of the degree of polymerisation of xylans

Aspartoylglycosylamines and their analogs having structures similar to 2-acetamido-1-N-(L-aspart-4-oyl)-2-deoxy-β-D-glucopyranosylamine, in which aspartic acid is linked to glycosylamines from 2-acetamido-2-deoxy-D-galactose, D-galactose, and D-mannose, and to cyclohexylamine and aniline, respectively, were synthesized. These syntheses were accomplished by condensing O-acetylglycosylamines, aniline, and cyclohexylamine with an aspartic acid derivative having blocked 1-carboxyl and 2-amino groups, followed by removal of the protecting groups. The stability of the synthetic compounds in acidic and alkaline media was investigated.