The distinct O2 quenching mechanism between fluorescence and phosphorescence for dyes adsorbed on silica gel

2020 ◽  
Vol 22 (46) ◽  
pp. 27144-27156
Author(s):  
Yu-Hsuan Cheng ◽  
Andrey Belyaev ◽  
Mei-Lin Ho ◽  
Igor O. Koshevoy ◽  
Pi-Tai Chou
Keyword(s):  
Silica Gel ◽  
Solid Phase ◽  
Cage Effect ◽  
Quenching Mechanism ◽  
Solvent Cage ◽  
Quenching Of Fluorescence ◽  
Fluorescence And Phosphorescence

In the solid phase, the lack of a solvent cage effect leads to the unstable CT states, rendering the decreased and thus a larger distinction between and , which therefore results in the efficient O2 quenching of fluorescence.

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%.

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.

scholarly journals CONTINUOUS PRODUCTION OF PURE SQUALENE BY USING COLUMN CHROMATOGRAPHY

2010 ◽  
Vol 5 (3) ◽  
pp. 251-254 ◽  
Author(s):  
Dosis Undjung
Keyword(s):  
Silica Gel ◽  
Column Chromatography ◽  
Sea Water ◽  
Solid Phase ◽  
Continuous Production ◽  
Continuous System ◽  
Raw Material ◽  
Central Kalimantan ◽  
Shark Liver Oil ◽  
Heater Tube

The purpose of this research was to produce pure Squalene using the Chromatography Column of Continuous System, so that it will be applicable in home industry. The raw material was a Shark caught from the sea water in Katingan Regency, Central Kalimantan. The result of this research concludes that the Column Chromatography of Continuous System in the experiment was able to produce pure Squalene with the level of purification of 79.89 % out of raw material was as long 180 minutes, by the elution speed of 4 mL per minute, and the eluen (liquid of the raw material) needed was as much as 900 mL, the solution lost (2 % of dietil eter in benzene) during the process was 2.04 %, the temperature in the heater tube was 110 oC, the number of the Silica gel G 40 types as what so-called solid phase in this process to purify 90 g of raw material was 90 g, and the amount of the solution remained in the pure Squalene was 1.5 ppm. Column Chromatography of Continuous System may be applicable in home industry to produce pure Squalene from Shark Liver Oil, the materials and equipment for this activity can be easily found as they are available in markets. A further analysis is needed to find out of contained compound for its further use.   Keywords: pure squalene, continuous system, column chromatography

Silica gel surface modified with sulfanilamide for selective solid-phase extraction of Cu(II), Zn(II) and Ni(II)

2009 ◽  
Vol 89 (14) ◽  
pp. 1043-1055 ◽  
Author(s):  
Xiaojun Zou ◽  
Yuemei Cui ◽  
Xijun Chang ◽  
Xiangbing Zhu ◽  
Zheng Hu ◽  
...  
Keyword(s):  
Solid Phase Extraction ◽  
Silica Gel ◽  
Solid Phase ◽  
Phase Extraction ◽  
Surface Modified

Functionalization of silica gel with 5-hydroxymethylfurfural: preparation, characterization and preliminary verification

2017 ◽  
Vol 41 (12) ◽  
pp. 4738-4742 ◽  
Author(s):  
Cheng Wang ◽  
Limin Huang ◽  
Yuanyuan Lin ◽  
Youjia Li ◽  
Yajing Hou ◽  
...  
Keyword(s):  
Liquid Chromatography ◽  
Silica Gel ◽  
Solid Phase ◽  
Hybrid Composites ◽  
Modified Silica ◽  
Modified Silica Gel ◽  
Inorganic Hybrid

Herein, we report the organic–inorganic hybrid composites comprising surficial-modified silica gel with 5-HMF as a solid phase for liquid chromatography.

Virial binding and the solvent cage effect

1994 ◽  
Vol 186 (1-2) ◽  
pp. 183-187
Author(s):  
A.A. Panjkov ◽  
E.R. Smith
Keyword(s):  
Cage Effect ◽  
Solvent Cage
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