Article 1 Immobilized artificial membrane chromatography 1 Ionization properties 1 Lipophilicity 1 Peptide nucleic acids Potentiometric pH titration 1 acid dissociation constant 1 adenine 1 chemical structure 1 chromatography 1 cytosine 1 dielectric constant 1 guanine 1 internalization (cell) 1 ionization 1 lipophilicity 1 membrane phospholipid 1 methanol 1 monomer 1 nuclear Overhauser effect 1 nucleic acid base 1 oligomer 1 pH 1 pKa 1 peptide nucleic acid 1 population distribution 1 potentiometric titration 1 retention time 1 thymine 1 voltammetry 1