scholarly journals Glycopolymer Grafted Silica Gel as Chromatographic Packing Materials

2018 ◽  
Vol 20 (1) ◽  
pp. 10 ◽  
Author(s):  
Gaoqi Ma ◽  
Xitao Luo ◽  
Xitong Sun ◽  
Weiyan Wang ◽  
Qinghui Shou ◽  
...  
Keyword(s):  
Reaction Time ◽  
Silica Gel ◽  
Separation Efficiency ◽  
Polar Compounds ◽  
Infrared Analysis ◽  
Hydroxyl Groups ◽  
Modified Silica Gel ◽  
Amide Bonds ◽  
Packing Structure ◽  
Unmodified Silica

The modification of the surface of silica gel to prepare hydrophilic chromatographic fillers has recently become a research interest. Most researchers have grafted natural sugar-containing polymers onto chromatographic surfaces. The disadvantage of this approach is that the packing structure is singular and the application scope is limited. In this paper, we explore the innovative technique of grafting a sugar-containing polymer, 2-gluconamidoethyl methacrylamide (GAEMA), onto the surface of silica gel by atom transfer radical polymerization (ATRP). The SiO2-g-GAEMA with ATRP reaction time was characterized by Fourier infrared analysis, Thermogravimetric analysis (TGA), and elemental analysis. As the reaction time lengthened, the amount of GAEMA grafted on the surface of the silica gel gradually increased. The GAEMA is rich in amide bonds and hydroxyl groups and is a typical hydrophilic chromatography filler. Finally, SiO2-g-GAEMA (reaction time = 24 h) was chosen as the stationary phase of the chromatographic packing and evaluated with four polar compounds (uracil, cytosine, guanosine, and cytidine). Compared with unmodified silica gel, modified silica gel produces sharper peaks and better separation efficiency. This novel packing material may have a potential for application with highly isomerized sugar mixtures.

Direct Reaction of Silica Gel with Butyllithium

2007 ◽  
Vol 2007 (9) ◽  
pp. 538-540
Author(s):  
Robert D. Guthrie
Keyword(s):  
Silica Gel ◽  
Silica Surface ◽  
Cold Water ◽  
Polar Compounds ◽  
Chromatographic Retention ◽  
Direct Reaction ◽  
Modified Silica Gel ◽  
Surface Areas ◽  
Butyl Group ◽  
Unmodified Silica

Silica gel with a variety of surface areas is found to react directly (no SOCl2 treatment required) with butyllithium to give a product with butyl groups attached. The extent of butyl group incorporation depends on available silica surface. With dehydrated 230–400 mesh silica gel, 7.4 mmoles of BuLi per g in pentane added in hexane gave silica with 2.5 mmoles of butyl groups per g provided that the silica gel was washed three times with cold water. It was found that water washing removes some unbutylated silicate increasing the apparent butyl group incorporation. The butyl-modified silica gel showed no chromatographic retention of 3-aminoquinoline in 50:50 hexane: dichloromethane or of thymol in hexane in contrast to unmodified silica gel which is known to strongly retain polar compounds, particularly basic ones. This contrast is demonstrated.

Quantitative Photoacoustic Spectroscopy: Determination of Fluorescein and Bromocresol Green Adsorbed on Modified Silica Gel Samples

1986 ◽  
Vol 40 (7) ◽  
pp. 1038-1042 ◽  
Author(s):  
R. S. Field ◽  
D. E. Leyden ◽  
R. S. Shreedhara Murthy
Keyword(s):  
Silica Gel ◽  
Photoacoustic Spectroscopy ◽  
Simultaneous Equations ◽  
Bromocresol Green ◽  
Modified Silica ◽  
Standard Samples ◽  
Modified Silica Gel ◽  
Two Component ◽  
Unmodified Silica

A series of standards was prepared by mixing the fluorescein or bromocresol green adsorbed on silica gel modified with N,N-diethylaminopro-pyltriethoxysilane with varying amounts of unmodified silica. Photoacoustic magnitude and phase values were obtained at their respective absorption maxima, 470 and 600 nm. Calibration graphs were prepared by combining the magnitude and phase into the response function. Two-component samples were prepared by mixing the different ratios of the standard samples. The concentration of the dyes in the two-component samples was determined by referring to the respective calibration graphs and solving a pair of simultaneous equations. The relative error in the determination ranged from −5.6% to 5.1% for fluorescein and −16.8% to 38% for bromocresol green when compared to their concentration determined by spectrophotometry.

Synthesis Process and Structure of Al/Mg Modified Silica-gel Particle.

2000 ◽  
Vol 116 (1) ◽  
pp. 56-61
Author(s):  
Tatsuo YAMAGUCHI ◽  
Toshiaki NAKAI ◽  
Kunihiko TAKEDA
Keyword(s):  
Silica Gel ◽  
Synthesis Process ◽  
Modified Silica ◽  
Modified Silica Gel

Highly Selective Separation and Enrichment of Phosphopeptides by Uranyl-Salophen Immobilized Silica Gel Material

2015 ◽  
Vol 1095 ◽  
pp. 341-344 ◽  
Author(s):  
Can Hui Xu ◽  
Guang Liang Zhang ◽  
Xin Zhou ◽  
Xi Lin Xiao ◽  
Chang Ming Nie ◽  
...  
Keyword(s):  
Silica Gel ◽  
Metal Ion ◽  
High Selectivity ◽  
Separation Efficiency ◽  
Solid Phase ◽  
Tetradentate Ligand ◽  
Peptide Mixtures ◽  
New Material ◽  
Solid Phase Material

The characterization of phosphoproteins requires highly specific methods for the separation and enrichment of phosphopeptides. Here we report a novel metal ion-immobilized solid phase material for the separation and enrichment of phosphopeptides. The material is uranyl-salophen-silica gel (USSG) particles in which salophen is a tetradentate ligand of uranyl ion. In USSG salophen is connected on the surface of silica gel and uranyl is bound on the surface through its coordination with salophen. Phosphopeptides can be selectively retained by USSG because uranyl-salophen can bind phosphate moiety with strong affinity and high selectivity. The new material USSG has been successfully used for the separation of phosphopeptides from peptide mixtures with the separation efficiency of 97.0% to 97.4%.

DFT studies on coordination models for adsorption essays of Cu(II) and Ni(II) solutions in modified silica gel with iminodiacetic groups

2016 ◽  
Vol 71 (6) ◽  
pp. 1019-1030 ◽  
Author(s):  
Alexander Carreño ◽  
Eduardo Schott ◽  
Ximena Zarate ◽  
Juan Manuel Manriquez ◽  
Juan C. Vega ◽  
...  
Keyword(s):  
Silica Gel ◽  
Dft Studies ◽  
Modified Silica ◽  
Modified Silica Gel

scholarly journals The Solid Phase Extraction of Some Metal Ions Using Palladium Nanoparticles Attached to Silica Gel Chemically Bonded by Silica-Bonded N-Propylmorpholine as New Sorbent prior to Their Determination by Flame Atomic Absorption Spectroscopy

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
M. Ghaedi ◽  
M. Rezakhani ◽  
S. Khodadoust ◽  
K. Niknam ◽  
M. Soylak
Keyword(s):  
Electron Microscopy ◽  
Metal Ions ◽  
Silica Gel ◽  
Solid Phase ◽  
Food Samples ◽  
Natural Food ◽  
Modified Silica Gel ◽  
Flame Atomic Absorption ◽  
Relative Standard

In this research at first palladium nanoparticle attached to a new chemically bonded silica gel has been synthesized and has been characterized with different techniques such as X-ray diffraction (XRD), fourier transform infrared (FT-IR), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). Then, this new sorbent (chemically modified silica gel with N-propylmorpholine (PNP-SBNPM)) was efficiently used for preconcentration of some metal ions in various food samples. The influence of effective variables including mass of sorbent, flow rate, pH of sample solutions and condition of eluent such as volume, type and concentration on the recoveries of understudy metal ions were investigated. Following the optimization of variables, the interfering effects of some foreign ions on the preconcentration and determination of the investigated metal ions described. At optimum values of variables, all investigated metal ions were efficiently recovered with efficiency more than 95%, relative standard deviation (RSD) between 2.4 and 2.8, and detection limit in the range of 1.4–2.7 ng mL−1. The present method is simple and rapidly applicable for the determination of the understudied metal ions (ng mL−1) in different natural food samples.

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