Data on the interaction of natural carbohydrates (mono-, oligo-, and p
olysaccharides, amino sugars, and natural organic acids of the carbohy
drate origin) with metal cations are surveyed and described systematic
ally. The structural diversity of carbohydrate metal complexes, caused
by some specific features of carbohydrates as ligands, is demonstrate
d. The influence of complex formation on the chemical properties of ca
rbohydrates is discussed. It is shown that the formation of metal comp
lexes plays an important role in the configurational and conformationa
l analysis of carbohydrates. The practical significance of the coordin
ation interaction in the series of carbohydrate ligands is demonstrate
d.