Examples of preferred oligomers and polymers are cyclodextrins containing a total of 6 to 8 glucose structural units forming a ting, and hydroxyalkyl and aminoalkyl derivatives and glucose- and maltose-substituted derivatives, of which at least one structural unit conforms to the formula XVI ##STR8## in which R8, R9 and R10 independently of one another, are H, C1 -C4 alkyl, in particular methyl, C