title: Dioctadecyl L-glutamide-derived lipid-grafted silica as a novel organic stationary phase for RP-HPLC.
abstract: Dialkyl L-glutamide-derived lipids have been found to form supramolecular assemblies and to show specific properties based on their highly ordered structures in aqueous and organic media. To use these unique properties to create molecular recognition systems, dioctadecyl L-glutamide-derived lipid-grafted porous silica particles (Sil-DSG) were newly prepared and used as a stationary phase in reversed phase liquid chromatography. Compared with conventional ODS (octadecylated silica), the Sil-DSG column showed remarkably higher selectivity for polycyclic aromatic hydrocarbons (PAHs). Especially, Sil-DSG recognized the molecular linearity and planarity of PAHs. Suspension state 1H NMR and 13C CP/MAS-NMR spectroscopies showed that the alkyl chains on the Sil-DSG are in gauche form and their mobility is strongly restricted at room temperature. This paper discusses higher selectivity of Sil-DSG with a carbonyl pi-benzene pi interactions.
authors.affiliation: Department of Applied Chemistry and Biochemistry, Kumamoto University, 2-39-1 Kurokami, Kumamoto, Japan.
authors.forename: Makoto
authors.initials: M
authors.lastname: Takafuji
authors.forename: M Mizanur
authors.initials: MM
authors.lastname: Rahman
authors.forename: Hamid R
authors.initials: HR
authors.lastname: Ansarian
authors.forename: Mahnaz
authors.initials: M
authors.lastname: Derakhshan
authors.forename: Toshihiko
authors.initials: T
authors.lastname: Sakurai
authors.forename: Hirotaka
authors.initials: H
authors.lastname: Ihara
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D018698:Glutamic Acid / Q000031:analogs & derivatives* / Q000737:chemistry*; D007536:Isomerism; D008055:Lipids / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D011084:Polycyclic Aromatic Hydrocarbons / Q000737:chemistry / Q000302:isolation & purification; D012822:Silicon Dioxide / Q000737:chemistry
chemical_list: D008055:Lipids; D011084:Polycyclic Aromatic Hydrocarbons; C026679:octadecylsilica; D018698:Glutamic Acid; D012822:Silicon Dioxide