The vapour pressures of binary mixtures of cloroalkane (1-chlorobutane, 1-chloropentane) + nitromethane or nitroethane were measured at temperatures between 298.15 K and 318.15 K. The vapour pressures vs. liquid phase composition data have been used to calculate the activity coefficients of the two components, and the excess molar Gibbs energies GE for the mixtures, using Barker’s method. Redlich-Kister, Wilson, NRTL and UNIQUAC equations, taking

A new perspective in the lipophilicity evaluation through RP-HPLC is permitted by analysis of the retention factor (k) obtained by injecting large volumes of test samples prepared in solvents immiscible with mobile phase. The experiment is carried out on representative groups of compounds with increased toxicity (mycotoxins and alkaloids) and amines with important biological activity (naturally occurring monoamine compounds and related drugs), which

The characterization and classification of some natural toxins (mycotoxins and alkaloids) is established by high-performance thin-layer chromatography (HPTLC) using chemically bonded stationary phases of RP-18, RP-18W, RP-8, RP-2, RP-NH2, RP-CN and RP-Diol. The used mobile phases are mixtures of methanol–water in different proportions of volume, chosen to create a suitable migration during the chromatographic process. The lipophilicity is described