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Titre du document / Document title

The use of water structure breakers, urea and guanidium chloride, new mobile phase modifiers in reversed-phase partition high-performance liquid chromatography

Auteur(s) / Author(s)

TAKAHASHI Toru (1) ; HOSHINO Hitoshi (1) ; YOTSUYANAGI Takao (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Department of Applied Chemistry, Graduated School of Engineering, Tohoku University, Aoba, Aramaki, Aoba-ku, Sendai 980-8579, JAPON

Résumé / Abstract

Organic solvent-free mobile-phase systems in ion-pair reversed-phase partition high-performance liquid chromatography (IPRP-HPLC) are demonstrated; using urea at 3.0 - 7.0 molal (mol kg-1) as a modifier in a mobile phase on an octadecylsilanized silica column, four nitrophenolates and metal 4-(2-pyridilazo)resorcinol (PAR) chelates (in PAR chelates system an aqueous mobile phase with 15 wt% methanol was used) were separated rapidly within 6 min at no sacrifice to the separation efficiency. On the addition of urea in the mobile phase, reduced retention times of nitrophenolates and naphthalenesulfonates and also diminution of the height equivalent to a theoretical plate were observed. The addition of urea and guanidium chloride (GuCl) in the mobile phase gave rise to a decrease in the mobile phase volume; in turn, this meant an increased volume of the stationary phase. As the concentration of urea and GuCl in the mobile phase increased, the volume of the mobile phase in the column decreased within about 70% and 40% at 7.0 molal of urea and GuCl, respectively. A decrease in the mobile phase volume suggests an increase in the extent of solvation of the bonded hydrocarbon chain of the stationary phase. The possible explanations for the LC behavior with the urea and GuCl are turned into reduction of hydrophobic interaction in LC processes, solute partitioning and entangling of alkyl chain brushes, with the addition of urea. The water structure breakers, urea and GuCl, most likely affect the solvation states of both solute molecules and the hydrocarboneous stationary phase by changing the nature of the water solvent, which provides a new technique for fine tuning of the LC resolution of the analytes.

Revue / Journal Title

Analytical sciences    ISSN  0910-6340   CODEN ANSCEN 

Source / Source

2001, vol. 17, no7, pp. 847-851 (35 ref.)

Langue / Language

Anglais

Editeur / Publisher

Japan Society for Analytical Chemistry, Tokyo, JAPON  (1985) (Revue)

Mots-clés anglais / English Keywords

Chemical analysis

;

Multicomponent analysis

;

Qualitative analysis

;

Vanadium Complexes

;

Organic ligand

;

Benzenic compound

;

Nitro compound

;

Reversed phase chromatography

;

HPLC chromatography

;

Ultraviolet detector

;

Chemical modification

;

Mobile phase

;

Urea

;

Molecular interaction

;

Hydrophobic interaction

;

Chromatographic properties

;

Chromatographic retention

;

Transition metal Complexes

;

Mots-clés français / French Keywords

Analyse chimique

;

Analyse multiélément

;

Analyse qualitative

;

Vanadium Complexe

;

Coordinat organique

;

Composé benzénique

;

Composé nitro

;

Chromatographie phase inverse

;

Chromatographie HPLC

;

Détecteur UV

;

Modification chimique

;

Phase mobile

;

Urée

;

Interaction moléculaire

;

Interaction hydrophobe

;

Propriété chromatographique

;

Rétention chromatographique

;

Résorcinol(4-[2-pyridyldiazényl])

;

Phénol(nitro)

;

Guanidium chlorure

;

Métal transition Complexe

;

Mots-clés espagnols / Spanish Keywords

Análisis químico

;

Análisis multielemento

;

Análisis cualitativo

;

Vanadio Complejo

;

Ligando orgánico

;

Compuesto bencénico

;

Compuesto nitro

;

Cromatografía fase inversa

;

Cromatografía HPLC

;

Detector UV

;

Modificación química

;

Fase móvil

;

Urea

;

Interacción molecular

;

Propiedad cromatográfica

;

Retención cromatográfica

;

Metal transición Complejo

;

Localisation / Location

INIST-CNRS, Cote INIST : 20879, 35400009947848.0080

Nº notice refdoc (ud4) : 1122824



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