scholarly journals Photoacoustic Determination of Cobalt after Solid-Phase Concentration on an Empore Silica-gel Thin-Layer Plate.

1992 ◽  
Vol 8 (5) ◽  
pp. 655-658 ◽  
Author(s):  
Katsumi UCHIYAMA ◽  
Keiko OHSAWA ◽  
Yoshihiro YOSHIMURA ◽  
Junichi MINOWA ◽  
Takaho WATANABE ◽  
...  
Keyword(s):  
Thin Layer ◽  
Silica Gel ◽  
Solid Phase ◽  
Thin Layer Plate ◽  
Phase Concentration ◽  
Solid Phase Concentration

Benzoates in Foods

1967 ◽  
Vol 50 (4) ◽  
pp. 985-988
Author(s):  
Matthew H Lewis ◽  
George Schwartzman
Keyword(s):  
Thin Layer ◽  
Silica Gel ◽  
Steam Distillation ◽  
Collaborative Study ◽  
Food Sample ◽  
Thin Layer Plate

Abstract A collaborative study was conducted on a steam distillation-TLC method for benzoates in foods. Prior to measurement using 5 cm micro cells, the preservatives are separated from the food sample by steam distillation, and extracted from the distillate by CHCl3-ether shake-out. The samples were spotted on a thin layer plate (silica gel GF254 and kieselguhr G), the chromatogram was developed, and the material was recovered from the plate by extracting with ethanol. This procedure easily detects 0.1 ppm benzoate in foods. The method is recommended for adoption as official, first action with further work to be done on the determination of hydroxybenzoates, propionates, and other preservatives.

scholarly journals Silica gel with covalently immobilized thiosemicarbazide for solid-phase concentration of mercury

2014 ◽  
Vol 18 (4) ◽  
pp. 451-457
Author(s):  
Dzh. N. Konshina ◽  
V. V. Open'ko ◽  
Z. A. Temerdashev ◽  
V. V. Konshin ◽  
K. A. Romanovskii
Keyword(s):  
Silica Gel ◽  
Solid Phase ◽  
Phase Concentration ◽  
Solid Phase Concentration

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.

Thin Layer Chromatographic Determination of Subsidiary Dyes in D&C Red No. 19 and D&C Red No. 37

1974 ◽  
Vol 57 (4) ◽  
pp. 961-962
Author(s):  
Sandra Bell
Keyword(s):  
Thin Layer ◽  
Silica Gel ◽  
Chromatographic Method ◽  
Chromatographic Determination

Abstract A thin layer chromatographic method is presented by which triethylrhodamine and other lower ethylated subsidiary colors are separated from D&C Red No. 19 and D&C Red No. 37. After removal from the plate, subsidiary dyes are extracted from silica gel C adsorbent and quantitated spectrophotometrically. Recoveries of 1, 2, and 5% of added triethylrhodamine ranged from 89 to 1 0 3% for D&C Red No. 19 and from 85 to 1 0 2% for D&C Red No. 37.

Thin Layer Chromatographic Determination of Citrinin

1979 ◽  
Vol 62 (1) ◽  
pp. 201-202 ◽  
Author(s):  
Robert D Stubblefield
Keyword(s):  
Acetic Acid ◽  
Thin Layer ◽  
Linear Relationship ◽  
Silica Gel ◽  
Coefficient Of Variation ◽  
Ethylenediaminetetraacetic Acid ◽  
Limit Of Detection ◽  
Chromatographic Determination ◽  
Tlc Plates

Abstract Clearly defined zones of citrinin can be obtained on thin layer chromatographic (TLC) plates and measured by fluorodensitometry. Silica gel plates were prepared as a slurry with aqueous 0.05M Na2EDTA (ethylenediaminetetraacetic acid), spread at 0.5 mm wet thickness, and activated at 105°C for 1 hr. Plates were developed in acetic acid-benzene (5+95). The limit of detection was 10 ng citrinin/zone. Densitometric analysis (365 nm excitation, 505 nm emission) revealed that a linear relationship exists for levels of 10 ng to at least 100 ng/zone wtih a coefficient of variation of ±5%.

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