Determination of Functionality Distributions in Telechelic Prepolymers by Thin-Layer Chromatography

1977 ◽  
Vol 50 (1) ◽  
pp. 63-70 ◽  
Author(s):  
T. I. Min ◽  
T. Miyamoto ◽  
H. Inagaki
Keyword(s):  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Complete Separation ◽  
Hydroxyl Groups ◽  
Simple Method ◽  
Flame Ionisation Detector ◽  
Layer Chromatography ◽  
Flame Ionisation ◽  
Ionisation Detector

Abstract Functionality distributions of telechelic prepolymers have been determined by thin layer chromatography (TLC). Commercially available 1,2-polybutadienes having either carboxyl or hydroxyl groups were examined. TLC with p-xylene as the developer made it possible to separate the sample into a nonfunctional component and a mixture of mono- and difunctional components. Complete separation of the sample into the three components was achieved by selecting the developer and development procedure appropriately. Quantification of the chromatograms was performed successfully in a TLC apparatus equipped with a flame ionisation detector. A simple method for the determination of the functionality distribution was proposed.

Simple Method for Determination of Glycine and Niacin in Drug Mixtures

1968 ◽  
Vol 51 (1) ◽  
pp. 11-14
Author(s):  
Keith L Egli ◽  
Anthony Romano
Keyword(s):  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Ultraviolet Absorption ◽  
Simple Method ◽  
Drug Mixtures ◽  
Layer Chromatography

Abstract A method, based on the formol titration of glycine and the ultraviolet absorption of niacin, has been developed for the determination of these compounds in drug mixtures. Neither compound requires isolation for the determination. Glycine and niacin are identified by thin layer chromatography

Determination of Aflatoxins in Vegetable Oils

1985 ◽  
Vol 68 (1) ◽  
pp. 136-137
Author(s):  
Noah Miller ◽  
Helena E Pretorius ◽  
Donald W Trinder
Keyword(s):  
Liquid Chromatography ◽  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Vegetable Oils ◽  
Simple Method ◽  
Silica Column ◽  
Coefficients Of Variation ◽  
Layer Chromatography ◽  
Chloroform Methanol

Abstract A simple method is proposed for determination of aflatoxins in vegetable oils. The method was successfully applied to both crude and degummed oils. The oil sample, dissolved in hexane, was applied to a silica column and washed with ether, toluene, and chloroform; aflatoxins were eluted from the column with chloroform-methanol (97 + 3). As quantitated by thin layer chromatography and liquid chromatography, the oils analyzed contained aflatoxin Bx at levels of 5-200 αg/kg. Recoveries of aflatoxin Bi standards added to aflatoxin-free oils were between 89.5 and 93.5%, with coefficients of variation of 6.3- 8.0%.

Determination of Quinomethionate (6-Methylquinoline-2,3-diyldithiocarbonate) Residues in Crops by In Situ Fluorometry

1976 ◽  
Vol 59 (1) ◽  
pp. 172-173
Author(s):  
Yves Francoeur ◽  
Victorin Mallet
Keyword(s):  
Thin Layer ◽  
Quantitative Determination ◽  
Petroleum Ether ◽  
Thin Layer Chromatography ◽  
Pesticide Residue ◽  
Simple Method ◽  
Layer Chromatography ◽  
Ppm Level

Abstract A simple method is described for the quantitative determination of quinomethionate (6-methylquinoline-2,3-diyldithiocarbonate) in crops. The pesticide residue is extracted with acetonitrile and partitioned in petroleum ether. After separation from the co-extractives by thin layer chromatography (TLC), the fluorescence is measured directly on a silica gel TLC plate. An average of 89% recovery is obtained at the 0.05 ppm level in apples, peaches, pears, and tomatoes.

DIE FLUOROMETRISCHE BESTIMMUNG VON TESTOSTERON, EPITESTOSTERON UND ANDROST-4-EN-3,17-DION NACH DÜNNSCHICHTCHROMATOGRAPHISCHER ISOLIERUNG AUS DEM HARN

1968 ◽  
Vol 58 (3) ◽  
pp. 353-363 ◽  
Author(s):  
W. Hubl ◽  
K. Schollberg
Keyword(s):  
Enzymatic Hydrolysis ◽  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Complete Separation ◽  
The Other ◽  
Simple Method ◽  
Layer Chromatography

ABSTRACT The authors describe a simple method for determining testosterone, epitestosterone and androstenedione. The method employs enzymatic hydrolysis for glucuronide conjugates, Girard-partition, thin-layer chromatography using alumina and polyamide and fluorometric quantitation of the eluted steroids. By means of TLC on polyamide it is possible to separate (testosterone + epitestosterone) from the other C19-steroids. The complete separation of testosterone from epitestosterone is obtained by TLC on alumina as well as on silicagel G.

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