Polystyrene bound stationary phase of excellent separation efficiency based on partially sub-2μm silica monolith particles

2013 ◽  
Vol 1303 ◽  
pp. 9-17 ◽  
Author(s):  
Faiz Ali ◽  
Won Jo Cheong ◽  
Zeid A. ALOthman ◽  
Abdullah M. ALMajid
Keyword(s):  
Stationary Phase ◽  
Separation Efficiency ◽  
Silica Monolith

Preparation and evaluation of a vancomycin-immobilized silica monolith as chiral stationary phase for CEC

2007 ◽  
Vol 28 (15) ◽  
pp. 2606-2612 ◽  
Author(s):  
Xiaoli Dong ◽  
Jing Dong ◽  
Junjie Ou ◽  
Yan Zhu ◽  
Hanfa Zou
Keyword(s):  
Stationary Phase ◽  
Chiral Stationary Phase ◽  
Silica Monolith ◽  
Preparation And Evaluation

scholarly journals Silica gel functionalized with imidazolium group via click chemistry – new stationary phase for ion chromatography

2021 ◽  
Vol 8 (4) ◽  
pp. 20218409
Author(s):  
D. A. Chuprynina ◽  
I. A. Lupanova ◽  
V. V. Konshin ◽  
D. N. Konshina
Keyword(s):  
Ion Exchange ◽  
Stationary Phase ◽  
Silica Gel ◽  
Separation Efficiency ◽  
Click Reaction ◽  
Exchange Chromatography ◽  
Retention Factors ◽  
Exchange Material ◽  
Ph Range

This manuscript describes the preparation of a simple effective ion-exchange material based on silica gel, on the surface of which methylimidazolium bromide is fixed using a click reaction. The resulting material was used as a stationary phase for the separation and determination of Cl–, NO2–, NO3–, I–, and SO42– using ion exchange chromatography. The separation efficiency and retention factors for the selected anions were studied in the pH range 3.5–6.5. The proposed material was used for the determination of Cl–, SO42– in water and can be suggested for successful use in real water samples.

scholarly journals Silica Monolithic Capillary Columns for Hilic Separations

2018 ◽  
Vol 46 (1) ◽  
pp. 39-42
Author(s):  
Dana Moravcová ◽  
Josef Planeta
Keyword(s):  
Stationary Phase ◽  
Separation Efficiency ◽  
Stationary Phases ◽  
Ammonium Hydroxide ◽  
Capillary Columns ◽  
Optimal Separation ◽  
Monolithic Capillary Columns ◽  
High Separation ◽  
Theoretical Plates ◽  
Separation Conditions

Abstract The monolithic capillary columns (0.1 mm x 150 mm) prepared by the acidic hydrolysis of tetramethoxysilane (TMOS) in the presence of polyethylene glycol (PEG) and urea were modified by zwitterionic stationary phases and evaluated under HILIC separation conditions by employing a mixture containing nucleosides and nucleotides. The polymeric layer of zwitterions did not affect the high separation efficiency of the original silica monolith. The prepared zwitterionic columns exhibited high separation efficiencies in a range 61,000-289,000 theoretical plates/m for a 2- methacryloyloxyethyl phosphorylcholine-based stationary phase and in a range 59,000-135,000 theoretical plates/m for a [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl)ammonium hydroxide-based stationary phase under optimal separation conditions. The grafted layer of zwitterions on the silica monolithic surface also significantly improved the separation selectivity to compounds of interest

scholarly journals Fabrication of permanent silver cement frit at the inlet of micro-columns: a significant progress toward realization of disposable micro-columns

2020 ◽  
Vol 32 (1) ◽  
pp. 22-27
Author(s):  
Hong Kyeong Jung ◽  
Miri Mun ◽  
Ashraf Ali ◽  
Won Jo Cheong
Keyword(s):  
Stationary Phase ◽  
Packed Column ◽  
Particle Surface ◽  
Empty Space ◽  
Packed Bed ◽  
Silica Monolith ◽  
Reaction Solution ◽  
Spherical Silica Particles ◽  
Silver Mirror Reaction ◽  
Column Inlet

The advent of disposable micro-columns will be a hope of workers of chromatography-related laboratories. A very critical and important requirement is the formation of affordable inlet frits. Welding a metal screen to a column inlet is not recommended because of the risk of damage to stationary phase. In this study, the Tollens probe (silver mirror reaction) was adopted to make affordable frits. Silver is reduced on the particle surface and in an empty space among the particles, forming a solid silver network structure at the column inlet area by injecting the reaction solution into the packed column at a depth of one third (10 cm) of the packed bed (0.5 mm × 300 mm). The silver cement structure was successfully formed, and the silver cement frit endured mobile phase flow well when C18 modified ground silica monolith particles were used to make the packed bed. The formation of the silver cement frit was not successful when the stationary phase based on conventional spherical silica particles was used. Negligible reduction of chromatographic performance by the silver cemented frit was observed. This study serves as the first step toward realization of disposable micro-columns.

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