title: Effects of large volume injection of aliphatic alcohols as sample diluents on the retention of low hydrophobic solutes in reversed-phase liquid chromatography.
abstract: Recent studies showed that injection of large volume of hydrophobic solvents used as sample diluents could be applied in reversed-phase liquid chromatography (RP-LC). This study reports a systematic research focused on the influence of a series of aliphatic alcohols (from methanol to 1-octanol) on the retention process in RP-LC, when large volumes of sample are injected on the column. Several model analytes with low hydrophobic character were studied by RP-LC process, for mobile phases containing methanol or acetonitrile as organic modifiers in different proportions with aqueous component. It was found that starting with 1-butanol, the aliphatic alcohols can be used as sample solvents and they can be injected in high volumes, but they may influence the retention factor and peak shape of the dissolved solutes. The dependence of the retention factor of the studied analytes on the injection volume of these alcohols is linear, with a decrease of its value as the sample volume is increased. The retention process in case of injecting up to 200μL of upper alcohols is dependent also on the content of the organic modifier (methanol or acetonitrile) in mobile phase.
authors.affiliation: University of Bucharest, Faculty of Chemistry, Department of Analytical Chemistry, Sos. Panduri, no 90, 050663 Bucharest, Romania.
authors.forename: Victor
authors.initials: V
authors.lastname: David
authors.affiliation: University of Bucharest, Faculty of Chemistry, Department of Analytical Chemistry, Sos. Panduri, no 90, 050663 Bucharest, Romania.
authors.forename: Toma
authors.initials: T
authors.lastname: Galaon
authors.affiliation: Pharmaceutical and Medicinal Chemistry Department, Pharmaceutical and Drug Industries Research Division, National Research Centre, Dokki, Cairo 12311, Egypt. Electronic address: haboulenein@yahoo.com.
authors.forename: Hassan Y
authors.initials: HY
authors.lastname: Aboul-Enein
mesh_terms: D020001:1-Butanol / Q000737:chemistry; D020003:1-Octanol / Q000737:chemistry; D000097:Acetonitriles / Q000737:chemistry; D000438:Alcohols / Q000737:chemistry*; D056148:Chromatography, Reverse-Phase / Q000379:methods*; D057927:Hydrophobic and Hydrophilic Interactions; D000432:Methanol / Q000737:chemistry; D012997:Solvents / Q000737:chemistry; D014867:Water / Q000737:chemistry
chemical_list: D000097:Acetonitriles; D000438:Alcohols; D012997:Solvents; D014867:Water; D020001:1-Butanol; D020003:1-Octanol; D000432:Methanol; C032159:acetonitrile
keywords: Aliphatic alcohols; Hydrophobicity; Injection volume; RP-LC; Sample solvent