Micelles as pseudo-stationary phases in micellar electrokinetic chromatography

Muijselaar, Pim G.; Otsuka, Koji; Terabe, Shigeru

doi:10.1016/s0021-9673(97)00632-8

Cited by 92 publications

(47 citation statements)

References 266 publications

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“…This behaviour maybe akin to the varying critical micelle concentration (CMC) of SDS in different solutions. Newberry [26], Muijselaar, et al [27] and Su, et al [28], have all shown via various studies that the CMC of SDS in divalent metal solutions is far less than its usual 8 × 10 -3 M in pure water being 4 × 10 -3 M for nickel and 2 × 10 -3 M for copper depending on concentration. As 4 × 10 -3 M corresponds to 0.6 g/l SDS content, it can be in ferred that the attained CMC enhanced YSZ particle dispersion which yielded an increased level of ceramic incorporation in the coating.…”

Section: Substrate Epoxy Resinmentioning

confidence: 99%

Effect of Sodium Dodecyl Sulphate on the Composition of Electroless Nickel – Yttria Stabilized Zirconia Coatings

Nwosu¹,

Davidson²,

Hindle

2011

ACES

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The influence of a surfactant on the composition of nickel-yttria stabilised zirconia (YSZ) cermet coatings, applied by electroless nickel plating technique was examined. The amphiphilic characteristics of anionic surfactant sodium dodecyl sulphate (SDS), was relied upon for enhanced dispersion of YSZ particles co-deposited for use as anodes in solid oxide fuel cell technology and potential heat absorbing layers in thermal barrier coatings. Optical microscopy was employed to study the correlation between the plating thickness, level of ceramic loading and SDS concentration while the effect of the surfactant and fineness of YSZ particles on the as-deposited coating's ceramic to metal ratio, was analysed using energy dispersive X-ray analysis (EDXA) characterisation technique.

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Section: Substrate Epoxy Resinmentioning

confidence: 99%

Effect of Sodium Dodecyl Sulphate on the Composition of Electroless Nickel – Yttria Stabilized Zirconia Coatings

Nwosu¹,

Davidson²,

Hindle

2011

ACES

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“…[1][2][3][4][5][6] Dansylamino acids 5 and peptides 6 have been resolved with Tween 20 and Brij 35, respectively. The resolution improvement is attributed to the binding of ionic analytes to the nonionic surfactant micelles.…”

Section: Introductionmentioning

confidence: 99%

Weak Binding of N-Alkylpyridinium Ions to Nonionic Surfactant Micelles as Studied by Capillary Zone Electrophoresis

2010

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“…3 Many researchers focus their work on the development of novel methods concerning MEKC by using modifiers. For example, cyclodextrin-modified MEKC (CD-MEKC) [4][5][6][7] borate-complex EKC 8,9 and ion-exchange EKC 10,11 have been reported.…”

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confidence: 99%

Reversal Behaviors of the Enantiomer Migration Order and the Stereo-selectivity of Cu(II) Complex with Amino Acid Enantiomers in Ligand Exchange-Micellar Electrokinetic Chromatography

et al. 2000

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Since the pioneering work of Terabe et al. 1,2 micellar electrokinetic chromatography (MEKC) has become a powerful technique for the analysis of both neutral and charged samples. 3 Many researchers focus their work on the development of novel methods concerning MEKC by using modifiers. For example, cyclodextrin-modified MEKC (CD-MEKC) 4-7 borate-complex EKC 8,9 and ion-exchange EKC 10,11 have been reported. Each of these methods has extended the application of MEKC to the analysis of various types of compounds. The mechanism of the ligand exchange was reported for the separation of dansyl amino acid enantiomers by liquid chromatography 12,13 and subsequently capillary electrophoresis. 13,14 Ligand exchange-micellar electrokinetic chromatography (LE-MEKC), a hybrid technique of the ligand exchange mechanism and MEKC, has been receiving increasing attention, because it offers the possibility of the simultaneous separation of optical isomers with the differences in the positional structure, such as o-, m-, p-enantiomers of amino acids, which contain a phenyl ring with different substituents 16 as well as positional and optical isomers of the tryptophan family. 17 Based on the ligand exchange mechanism, it is the difference in the stability constants that give the chiral separation of enantiomers. In other words, the EMO depends on the stability of the complex. Therefore, EMO can be predicted based on the stability of the complex. Conversely, the EMO can be applied in a study of complex stability.In order to explore the mechanism of LE-MEKC and to provide some scientific evidence for predicting and controlling the EMO or for studying the complex stability of a ternary Cu(II) complex with different amino acid enantiomers, it is significant to study the separation behavior of enantiomers in LE-MEKC. In fact, many works have thrown light on the reversal of the EMO. 14,15,18-22 Our previous work involved the separation behavior of amino acid enantiomers in LE-MEKC, 23 in which we discussed the reversal of EMO of amino acids and o-, m-and p-order of enantiomers with the introduction of micellar phases. In this paper we focus our study on the influence of ligand chirality, trans-and cis-conformation of 4-hydroxy group in hydroxyproline and the SDS micellar phase on the separation behavior when using different ligands of the proline family in LE-MEKC. Experimental InstrumentationThe CE instrumental setup involves a HEL5-30P2-TTu high voltage power supply (Matsusada Precision Devices Inc., Japan), a CE-971 UV detector (Jasco Corporation, Japan) and a C-R6A Chromatopac Recorder (Shimadzu, Japan). Separations were carried out in fused-silica capillaries (0.050 mm i.d.×0.375 mm o.d.) from GL Sciences Inc. (Japan) with a total length of 56 cm and an effective length of 40 cm. ChemicalsAll of the chemicals were of reagent grade and were used as Hachioji, Japan The dependence of the enantioselectivity and enantiomer migration order (EMO) on the chirality and stereo-conformation of ligands used for the chiral selectors of Cu(...

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Micelles as pseudo-stationary phases in micellar electrokinetic chromatography

Cited by 92 publications

References 266 publications

Effect of Sodium Dodecyl Sulphate on the Composition of Electroless Nickel – Yttria Stabilized Zirconia Coatings

Effect of Sodium Dodecyl Sulphate on the Composition of Electroless Nickel – Yttria Stabilized Zirconia Coatings

Weak Binding of N-Alkylpyridinium Ions to Nonionic Surfactant Micelles as Studied by Capillary Zone Electrophoresis

Reversal Behaviors of the Enantiomer Migration Order and the Stereo-selectivity of Cu(II) Complex with Amino Acid Enantiomers in Ligand Exchange-Micellar Electrokinetic Chromatography

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