[show abstract][hide abstract] 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.
Journal of the American Society for Mass Spectrometry 02/2006; 17(1):9-14. · 3.59 Impact Factor
[show abstract][hide abstract] ABSTRACT: Three hairpin polyamides were designed and synthesized by a haloform reaction and DCC/HOBt coupling reaction without amino protection and deprotection. Their anticancer activity were investigated with three kinds of cell lines--hepatic carcinoma, lung carcinoma and gastric carcinoma, and the values of IC50 were at range of 10(-7) to approximately 10(-8) M.
Archives of Pharmacal Research 11/2002; 25(5):585-9. · 1.54 Impact Factor
[show abstract][hide abstract] ABSTRACT: The electrospray ionization tandem mass spectrometric (ESI-MS/MS) characteristics and fragmentation mechanisms of eight distamycin analogues containing N-methylpyrrole and N-methylimidazole were investigated. The members of two isomeric groups of distamycin analogues with the same elemental composition can be distinguished by MS/MS spectra of protonated molecules and of significant fragment ions.
Rapid Communications in Mass Spectrometry 02/2002; 16(11):1035-9. · 2.51 Impact Factor