Coupled Gas Chromatographic Methods for Separation, Identification, and Quantitative Analysis of Complex Mixtures: Mdgc, Gc-Ms, Gc-Ir, Lc-Gc

Schomburg, G.; Husmann, H.; Podmaniczky, L.; Weeke, F.

doi:10.1515/9783110855944.121

Cited by 27 publications

(28 citation statements)

References 5 publications

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“…The coating of the silica is performed with "prepolymers" which are synthesized in a separate step and then applied to the support material and immobilized. Further information regarding this subject may be found in the review by Schomburg [39].…”

Section: Silica-based Cation Exchangersmentioning

confidence: 99%

Modern stationary phases for ion chromatography

Weiss¹,

Jensen²

2003

Anal Bioanal Chem

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Due to the better understanding of the processes taking place at the surface of the stationary phases, the number of ion-exchange materials for ion chromatography (IC) has increased tremendously over recent years. As a result, the multitude of commercially available columns today with their different selectivities for anion and cation chromatography is almost confusing. Hence, the aim of this article is to describe the different principles determining selectivity and ion-exchange capacity and to classify the various ion-exchange materials accordingly. To ensure a fair comparison of these columns, the selectivity differences are illustrated by showing separations of standards rather than individual samples. Keywords Ion chromatography · Stationary phases · Support materials · Inorganic anions and cations · Organic anions and cations Anion exchangersPolymer-based anion exchangers Styrene/divinylbenzene copolymers, polymethacrylate, and polyvinyl resins are the most important organic polymers that are used as substrate materials in the manufacturing process for polymer-based anion exchangers.

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Section: Silica-based Cation Exchangersmentioning

confidence: 99%

Modern stationary phases for ion chromatography

Weiss¹,

Jensen²

2003

Anal Bioanal Chem

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“…Polymer-coated stationary phases that combine the mechanical properties of porous metal oxides, such as silica, alumina, zirconia and titania, with the versatility of organic polymers has been the major focus of this search [73][74][75][76]. Such composite materials show great potential, as ideal chromatographic supports that are mechanically and chemically stable, possess minimal non-specific adsorptivity and allow the flexible tailoring of chromatographic selectivity.…”

Section: Introduction To Polymer Coatingmentioning

confidence: 99%

Part II. Chromatography using ultra-stable metal oxide-based stationary phases for HPLC

Nawrocki

Dunlap

et al. 2004

Journal of Chromatography A

195

115

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“…Non-polar stationary phases have been chemically bonded to alumina by reaction with organosilanes [15], organolithium compounds [16], and phosphorous-containing organic materials [17]. Coating of a hydrophobic polymer on Aluspher Al, such as polybutadiene (PBD) and polymethyloctadecylsiloxane [18,19], yields a chromatographic material with typical RP properties: Aluspher 100 RP-select B. However, few systematic studies of the chromatographic properties of alumina-based RP materials have been reported so far [20].…”

Section: Introductionmentioning

confidence: 99%

Retention and selectivity tests of silica‐based and metal‐oxide bonded stationary phases for RP‐HPLC

Jandera¹,

Novotná

Beldean‐Galea

et al. 2006

J of Separation Science

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Chromatographic properties of silica-, zirconia- and alumina-based columns with octadecyl-, polyethylene glycol- and pentafluorophenylpropyl-bonded stationary phases were tested. Selectivities of nine columns for LC were characterized using chromatographic methods including Walters, Engelhardt, Tanaka and Galushko hydrophobicity and silanol activity tests, measurements of methylene selectivity in various aqueous-methanol and aqueous-acetonitrile mobile phases and of gradient lipophilic capacity as a measure of the effect of the sample hydrophobicity on gradient-elution separations. A semi-empirical interaction indices model, assuming a predominant role of the solvophobic interactions of test compounds with different polarities, was compared with the linear free energy relationships approach taking into account selective polar interactions. The interaction indices model was applied to both non-polar stationary phases bonded on silica, alumina and zirconia supports, and to the non-modified adsorbents in the normal-phase LC. The retention data of isomeric naphthalene disulfonic acids were used to compare the attractive and repulsive ionic interactions of the columns in purely aqueous mobile phases. The results of the hydrophobicity and polarity tests were consistent, and allowed column characterization and classification. Silanol activity was important with octadecyl silica columns, but was relatively insignificant with bonded polyethylene glycol and pentafluorophenylpropyl phases on silica gel support. Polar interactions with the alumina and zirconia support materials significantly affect the retention.

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Coupled Gas Chromatographic Methods for Separation, Identification, and Quantitative Analysis of Complex Mixtures: Mdgc, Gc-Ms, Gc-Ir, Lc-Gc

Cited by 27 publications

References 5 publications

Modern stationary phases for ion chromatography

Modern stationary phases for ion chromatography

Part II. Chromatography using ultra-stable metal oxide-based stationary phases for HPLC

Retention and selectivity tests of silica‐based and metal‐oxide bonded stationary phases for RP‐HPLC

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