Ionic substances with melting points at or close to room temperature are referred as ionic liquids. Interest in liquids for their potential different chemical processes is increasing, because they environmentally benign and good solvents a wide range of both organic inorganic materials. In this study, capillary electrophoretic method resolving phenolic compounds found grape seed extracts reported. The method, which 1-alkyl-3-methylimidazolium-based used the running electrolytes, simple...

Mixtures of randomly substituted sulfated cyclodextrins (degree substitution, ∼7−10) were successfully used as chiral additives for the enantioseparation 56 compounds pharmaceutical interest, including anesthetics, antiarrhythmics, antidepressants, anticonvulsants, antihistamines, antihypertensives, antimalarials, relaxants, and bronchodilators. The separations accomplished at pH 3.8, with anode detector end column. Under these conditions, in which electroosmotic flow is directed toward...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDerivatized cyclodextrins for normal-phase liquid chromatographic separation of enantiomersDaniel W. Armstrong, Apryll M. Stalcup, Martha L. Hilton, Jo Dee. Duncan, James R. Faulkner, and San Chun. ChangCite this: Anal. Chem. 1990, 62, 15, 1610–1615Publication Date (Print):August 1, 1990Publication History Published online1 May 2002Published inissue 1 August...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeparin: A Chiral Mobile-Phase Additive for Capillary Zone ElectrophoresisApryll M. Stalcup and Nana AgyeiCite this: Anal. Chem. 1994, 66, 19, 3054–3059Publication Date (Print):October 1, 1994Publication History Published online1 May 2002Published inissue 1 October 1994https://pubs.acs.org/doi/10.1021/ac00091a011https://doi.org/10.1021/ac00091a011research-articleACS PublicationsRequest reuse permissionsArticle Views274Altmetric-Citations121LEARN...

Abstract One of the major challenges facing chemical industry is development new, "green" technologies which reduce environmental impact manufacturing processes. Ionic liquids are emerging as a promising alternative to traditional organic solvents and are, thus, generating considerable interest in variety areas. This review examines some unique properties ionic their applications analytical separations.

Various Brassica species accumulate Se into the thousands of ppm. This suggests some them as candidates for phytoremediation. juncea (Indian mustard) was used to selenium by growing with sodium selenite source under hydroponic conditions resulting in accumulation up hundreds ppm various parts plant. To date, few speciation studies have been done plants, most reporting total concentration extraction evaluated several digestion/extraction procedures, including use HCl, Tris-HCl buffer, and...

Sulfated β-cyclodextrin, a negatively charged chiral selector, was used for the enantiomeric separation of racemic terbutaline by capillary electrophoresis. Chiral found to increase with decreasing cyclodextrin concentration. Host−guest complex binding constants this system were determined UV difference spectroscopy (Kav = 1490 M-1) and CE under conditions minimal EOF reversed polarity (K1 1730 M-1, K2 1590 α 1.09). The effect organic modifiers, methanol, acetonitrile also studied over wide...

A capillary electrophoretic method for resolving phenolic compounds found in grape seed extracts was developed using a quaternary ammonium salt as the main electrolyte solution. Seven polyphenols were separated and identified. The separation mechanism seems to involve association between cations polyphenols. Migration times roughly correlate with size of known phenols. role alkyl substituents on ions investigated is discussed. analysis proposed herein exhibits high reproducibility terms...

Quinine was used as a chiral additive in nonaqueous capillary zone electrophoresis. The separation buffer consisted of ammonium acetate and quinine methanol. able to enantioresolve number N-3,5-dinitrobenzoylated amino acids well (±)-1,1′-binaphthyl-2,2′diyl hydrogen phosphate N-[1-(1-naphthyl)ethyl]phthalamic acid. Enantioresolution deteriorated the concentration increased but improved with addition acetic Chiral recognition seems arise through an ion-pairing mechanism. © 1996 John Wiley &...

Abstract Sulfated β-cyclodextrin (SO3-β-CD) was utilized as a chiral additive for capillary zone electrophoresis (CZE). Chiral separations of several uhcharged enantiomers, such phensuximide, indapamide, etc., which are difficult to separate using neutral CDs, were achieved. The effects SO3-β-CD concentration and the pH ionic strength supporting electrolyte well presence an organic modifier, methanol, discussed.

The enantiomeric separation of three underivatized selenoamino acids, D,L-selenocystine, D,L-selenomethionine and D,L-selenoethionine, with UV ICP-MS detection is described. An HPLC column a chiral crown ether stationary phase mobile 0.10 M HClO4 was used. Absolute limits obtained ranged from 34.5 to 47.1 ng whereas those the plasma detector were ca. 40–400 times better. separations either good, little effect on resolution. Ten commercially available dietary selenium supplements analyzed...

A new sulfated β-cyclodextrin (degree of substitution ≈ 13−14/cyclodextrin) bonded chiral stationary phase (CSP) for high-performance liquid chromatography is introduced. The novel CSP was used to resolve a number enantiomeric pairs, including antihistamines, antidepressants and phenylhydantoins, using HPLC under variety mobile conditions. Among the 33 analytes successfully enantioresolved, all but six had some amine functionality. Generally, best separations were obtained in which...