Investigation of noncovalent complexes between beta-cyclodextrin and polyamide acids containing N-methylpyrrole and N-methylimidazole by electrospray ionization mass spectrometry.

Huihui Li, Jiang Zhou, Feili Tang, Gu Yuan

Index: J. Am. Soc. Mass Spectrom. 17(1) , 9-14, (2006)

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Abstract

Electrospray ionization (ESI) mass spectrometry was utilized to investigate noncovalent complexes between beta-cyclodextrin (beta-CD) and five novel polyamide acids containing N-methylpyrrole and N-methylimidazole. The 1:1 binding mode was specified by examining the binding stoichiometry from ESI mass spectra. It found that polyamide acids with beta-CD have binding affinities in the order: ImImImbetaCOOH > ImPyImbetaCOOH > ImPyPybetaCOOH > PyPyPybetaCOOH > NO(2)PyPyPybetaCOOH. The method gives, simultaneously, the binding constants between beta-CD and polyamide acids based on a novel linear equation.