title: Lipophilicity of amine neurotransmitter precursors, metabolites and related drugs estimated on various TLC plates.
abstract: The retention behavior for a series of amine neurotransmitters, their precursors, metabolites and structurally related drugs has been investigated in reversed-phase thin-layer chromatography using RP-18, RP-8, RP-2, CN and Diol stationary phases and mixtures of phosphate buffer and methanol as mobile phase. According to the computed lipophilicity of the neutral form of the investigated compounds, the most lipophilic compound is dobutamine (log P(N) = 3.78), while the less lipophilic is norepinephrine (log P(N) = -0.14). The experimental results also show dobutamine as the most lipophilic compound in the case of RP-18 and CN stationary phases (RM0(RP-18) = 1.58 and RM(CN) = 1.21), while RP-8 indicates norepinephrine as the less lipophilic one (RM0(RP8) = -0.70). Both the theoretical computation and the experimental data revealed that only one ionic form of the compounds prevails in the used chromatographic conditions. In addition, the evaluation of the experimental results showed that a similar chromatographic behavior could be assumed in the case of RP-18, RP-8 and CN stationary phases. Moreover, the mRM (mean of the RM values) and PC1/RM (scores of the first principal component) experimental lipophilicity indices showed a high correlation with the computed lipophilicity indices.
authors.affiliation: Department of Chemistry, Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, Arany Janos Str., No. 11, RO-400028 Cluj-Napoca, Romania.
authors.forename: Simona Codruţa
authors.initials: SC
authors.lastname: Cobzac
authors.affiliation: Department of Chemistry, Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, Arany Janos Str., No. 11, RO-400028 Cluj-Napoca, Romania.
authors.forename: Dorina
authors.initials: D
authors.lastname: Casoni
authors.affiliation: Department of Chemistry, Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, Arany Janos Str., No. 11, RO-400028 Cluj-Napoca, Romania csarbu@chem.ubbcluj.ro.
authors.forename: Costel
authors.initials: C
authors.lastname: Sârbu
mesh_terms: D000588:Amines / Q000032:analysis* / Q000737:chemistry*; D056148:Chromatography, Reverse-Phase; D002855:Chromatography, Thin Layer / Q000379:methods*; D016000:Cluster Analysis; D004280:Dobutamine / Q000032:analysis / Q000737:chemistry / Q000378:metabolism; D000432:Methanol / Q000737:chemistry; D018377:Neurotransmitter Agents / Q000032:analysis* / Q000737:chemistry / Q000378:metabolism*; D009638:Norepinephrine / Q000032:analysis / Q000737:chemistry / Q000378:metabolism
chemical_list: D000588:Amines; D018377:Neurotransmitter Agents; D004280:Dobutamine; D009638:Norepinephrine; D000432:Methanol