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Wednesday, July 29, 2020 | History

5 edition of Silica gel and bonded phases found in the catalog.

Silica gel and bonded phases

their production, properties, and use in LC

by Raymond P. W. Scott

  • 348 Want to read
  • 32 Currently reading

Published by Wiley in Chichester, New York .
Written in English

    Subjects:
  • Silica gel.

  • Edition Notes

    Includes bibliographical references and index.

    Statementby Raymond P.W. Scott.
    SeriesSeparation science series
    Classifications
    LC ClassificationsTP245.S5 S355 1993
    The Physical Object
    Paginationviii, 261 p. :
    Number of Pages261
    ID Numbers
    Open LibraryOL1404168M
    ISBN 100471939854
    LC Control Number93012284

    Silica gel is an amorphous and porous form of silicon dioxide (silica), consisting of an irregular tridimensional framework of alternating silicon and oxygen atoms with nanometer-scale voids and voids may contain water or some other liquids, or may be filled by gas or the last case, the material is properly called Silica xerogel. Appearance: Transparent beads. The hydrosilylation of allyl alcohol on amorphous hydride silica produces 3-hydroxypropyl bonded phases with a high yield (~ 5 µmol/m 2). Most importantly, the successful regio-selective (C-silylation) immobilization of propanol groups on silica substrates further confirms the suitability of the growing conception regarding the rigid cage-like Cited by: 2.

    Chemically bonded silica gel is silica gel packing material to which a stationary phase functional group has been bonded chemically (by covalent bonding). Chemically bonded silica gel is normally made by reacting an organosilane compound that can contain various functional groups with the silanol groups on the surface of the silica gel (a. Silica gel for chromatography, octylsilyl. Kinetex C8 µm*, µm* Silica gel for chromatography, octylsilyl R1. Bonding of octylsilyl and methyl groups (double bonded phase). Kinetex C8 µm*, µm* Silica gel for chromatography, octylsilyl, base-deactivated pretreated before the bonding by.

    Typical adsorbents used in gas-solid chromatography are silica gel, alumina, carbon and bonded phases. These are mostly used in the separation of the permanent gases and the low molecular weight hydrocarbon gasses. Adsorbents used in liquid solid chromatography are mostly silica gel and various types of bonded phases. Silica gel is one of the important materials in chemistry. Its chemical surface characteristics have made silica gel as a starting material for the production of several different stationary phases in separation chemistry. Chemically, amorphous silica gel is produced by the condensation polymerisation of .


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Silica gel and bonded phases by Raymond P. W. Scott Download PDF EPUB FB2

Deals with silica gel from the perspective of both the analytical chemist and chromatographer. Provides the reader with a basic understanding of the physical and chemical properties of silica gel and bonded phases as well as how these properties impact on the quality Cited by:   Silica Gel--Its History and Formation.

The Production of Silica Gel. Test Procedures and LC Column Packing. The Silica Gel Silica gel and bonded phases book.

The Exclusion Properties of Silica Gel. Solvent/Solute Interactions with the Silica Gel Surface. An Introduction to Bonded Phases. The Synthesis of Bonded Phases. The Characteristics of Reverse Phases.5/5(1).

Deals with silica gel from the perspective of both the analytical chemist and chromatographer. Provides the reader with a basic understanding of the physical and chemical properties of silica gel and bonded phases as well as how these properties impact on the quality.

Get this from a library. Silica gel and bonded phases: their production, properties, and use in LC. [Raymond P W Scott]. Silica gel and bonded phases: Their production; properties and use in LC.

By R. Scott; John Wiley & sons; Chichester; ; pp. Silica Gel--Its History and Formation. The Production of Silica Gel. Test Procedures and LC Column Packing. The Silica Gel Surface. The Exclusion Properties of Silica Gel. Solvent/Solute Interactions with the Silica Gel Surface.

An Introduction to Bonded Phases. The Synthesis of Bonded Phases. The Characteristics of Reverse Phases. Two types of chemically bonded phases for high-performance liquid chromatography (HPLC) have been prepared: a conventional C18 and AP (N-acylaminopropylsilica), a novel one that contains specific interaction sites localized in the hydrophobic by: 14 rows  Propylphenylsilane ligands attached to the silica gel show weak dipole - induced dipole.

The allyl-bonded stationary phase. Journal of Chromatography A, DOI: /S(01) Heinz Engelhardt, Peter Orth. Alkoxy Silanes for the Preparation of Silica Based Stationary Phases with Bonded Polar Functional Groups.

Journal of Liquid Chromatography10 (), DOI: /Cited by: This fact is the main reason for the success of reversed-phase chromatography, which is more reliable and uses easily regenerated columns. The more polar polyol and polyphenol silica gel phases allow POLYOL BONDED TO SILICA GEL AS STATIONARY PHASE 29 jog Mw 5 4 3 2 2 4 6 8 vR(mi)o Fig.

by: Luna Column Selection by Ph. Eur. Listings and Tolerances Adjusting Ph. Eur. Methods: LC, Isocratic Elution 1. Composition of the mobile phase: ± 30 % (relative) The amount of the minor component can be adjusted by ± 30 % relative or ± 2 % absolute, whichever is the larger.

However a change in any component cannot exceed ± 10 % Size: KB. Types and characteristics of normal-phase columns Normal-phase chromatography is useful for the separation of positional isomers that are difficult to separate in reversed-phase mode.

YMC Co., Ltd. offers normal-phase columns packed with bare silica gel or packed with silica gel modified with polar groups. 80 AM. First presented at the 6th Brazilian Meeting on Adsorption held in Maringá, State of Paraná, Southern Brazil on August 13 16, *Author to whom all correspondence should be addressed.E-mail: [email protected] Hybrid CBonded Silica Phases: Application in Acetaminophen Adsorption Carolina Feier Pinto, Fernando Silveira, Fernanda C.

Stedile and João Henrique Z. dos. A stationary phase chemically bonded to a support that is used for the separation. It is the most commonly used LC mode. The most popular support used is microparticulate silica gel.

An organosilane, such as octadecyl (for reversed-phase chromatography), is the most accepted type of bonded phase. The book is the fourth volume in the Separation Science Series edited by R. Scott and C. Simpson and covers briefly the basic principles of silica gel chemistry, the synthesis and propertics of silica-based bonded phases, and their application in reverse-phase chromatography (RPC).

The book provides an easy-to-read introduction into the subject from the authors with year experience in Author: Unger, Klaus.

Use of µm silica as the base material gave the best chromatographic efficiency. Both non-polar silanes and ones containing polar functional groups were bonded successfully. For high surface area silica, bonded phase coverages depended on the organosilane reactant and varied from 7 to 17 weight by: Acetylated and/or 3,5‐dimethylphenylcarbamated riboflavins were prepared and the resulting riboflavin derivatives as well as natural riboflavin were regioselectively immobilized on silica gel through chemical bonding at the 5’‐O‐ or 3‐N‐position of the riboflavin to develop novel chiral stationary phases (CSPs) for enantioseparation by high‐performance liquid chromatography (HPLC).Cited by: 5.

Reversed phase material. Useful for HIC and ion-pairing chromatography. Offers less retention than C8 and C18 phases for non-polar solutes. When bonded to Å silica, it is an ideal phase for analyzing and purifying large proteins and macromolecules.

c5 Pentyl Si C 5 H 11 Reversed phase material. Useful for reversed phase separation of File Size: KB. Silica surface possesses active silanols, which permits the modification of the surface chemistry by grafting silane moieties.

This property allows the control of the surface polarity, that is useful in separation techniques. Various types of silanes can be grafted on the surface to afford monomeric or polymeric bonded phases. Bonded Phases - Characteristics of Bonded Phases. Another bonding process developed by Grushka (8) involved the deposition of a polypeptide on the silica gel surface for specific use in the separation of substances of biological origin.

The silica is first treated with 1-trimethoxysilyl-2 (4-chloromethylphenyl)-ethane in benzene and subsequently shaken for about 6 hours to provide an anchoring group for the. SILICA GEL; BONDED PHASES; Cyano Can be used in both normal and reversed phase. Recommended Applications: Cyclosporins from serum/blood, Antidepressants from serum, Benzalkonium Chloride from aqueous solution, Beta-blockers from serum, Carbohydrates from aqueous solution, Narcotics from plasma, Herbicides from water.

Spherical Silica Gel.One other important category of bonded phases involves the attachment of optically pure groups to silica gel. The compound dinitrobenzoyl-L-leucine is one example of such a phase.

These types of phases are used for the separation of enantiomers.Bonded Phase Synthesis. The aminopropyl bonded phase (Silica-NH2) was prepared by reacting LiChrospher Si silica with ç-(aminopropyl)triethoxysilane as described by Engelhardt and Orth Prior to the reaction, approximately5gofsilica was washed with deionized water and dried at K for 20 h.

Subsequently, the silica was dispersed in.