| The use of water structure breakers, urea and guanidium chloride, new mobile phase modifiers in reversed-phase partition high-performance liquid chromatography. | |
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MedLine Citation:
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PMID: 11708117 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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T Takahashi; H Hoshino; T Yotsuyanagi |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Analytical sciences : the international journal of the Japan Society for Analytical Chemistry Volume: 17 ISSN: 0910-6340 ISO Abbreviation: Anal Sci Publication Date: 2001 Jul |
Date Detail:
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Created Date: 2001-11-15 Completed Date: 2002-01-03 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8511078 Medline TA: Anal Sci Country: Japan |
Other Details:
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Languages: eng Pagination: 847-51 Citation Subset: IM |
Affiliation:
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Department of Applied Chemistry, Graduated School of Engineering, Tohoku University, Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan. toru@analchem.che.tohoku.ac.jp |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Anions Chromatography, High Pressure Liquid / methods* Chromatography, Liquid / methods* Dose-Response Relationship, Drug Guanidine / chemistry* Temperature Time Factors Urea / chemistry* Water / chemistry* |
| Chemical | |
Reg. No./Substance:
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0/Anions; 113-00-8/Guanidine; 57-13-6/Urea; 7732-18-5/Water |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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