Zwitterions can be predominant in membrane penetration of drugs

Experimental proof

Károly Mazák, B. Noszál

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The complete set of species-specific partition coefficients was determined, and the predominant contribution of zwitterionic species to the overall lipophilicity was experimentally proven for the first time. The compounds studied were the amphoteric eburnane alkaloid cis- and trans-apovincaminic acids of therapeutic interest. Partition of the individual microspecies was mimicked by model compounds of the closest possible similarity, and then correction factors were determined and introduced. The noncharged microspecies of the cis-epimer is 30 900 times as lipophilic as its zwitterionic protonation isomer, while the analogous ratio for the trans-epimer is around 15 800. Due to the overwhelming dominance of the zwitterionic form, however, its contribution to the overall lipophilicity exceeds 8 and 5 times that of the noncharged form for the two epimers, respectively. The lipophilicity profile of these zwitterionic compounds is expressed, calculated, and depicted in terms of species-specific lipophilicities over the entire pH range.

Original languageEnglish
Pages (from-to)6942-6947
Number of pages6
JournalJournal of Medicinal Chemistry
Volume55
Issue number15
DOIs
Publication statusPublished - Aug 9 2012

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Alkaloids
Membranes
Pharmaceutical Preparations
Therapeutics
apovincaminic acid

ASJC Scopus subject areas

  • Molecular Medicine
  • Drug Discovery

Cite this

Zwitterions can be predominant in membrane penetration of drugs : Experimental proof. / Mazák, Károly; Noszál, B.

In: Journal of Medicinal Chemistry, Vol. 55, No. 15, 09.08.2012, p. 6942-6947.

Research output: Contribution to journalArticle

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