The value of preparative thin-layer chromatography for the routine determination of pregnanediol

1964 ◽  
Vol 90 (1) ◽  
pp. 132-135 ◽  
Author(s):  
H. Lorrin Lau ◽  
Georgeanna Seegar Jones
Keyword(s):  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Preparative Thin Layer Chromatography ◽  
Layer Chromatography

Determination of Biphenyl in Citrus Fruits by Thin Layer Chromatography and Ultraviolet Spectrophotometry

1967 ◽  
Vol 50 (4) ◽  
pp. 934-938
Author(s):  
Paul E Corneliussen
Keyword(s):  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Uv Light ◽  
Preparative Thin Layer Chromatography ◽  
Mean Deviation ◽  
Citrus Fruits ◽  
Ultraviolet Spectrophotometry ◽  
Spectrophotometric Measurement ◽  
Layer Chromatography

Abstract A rapid method for determining biphenyl in citrus fruits has been developed and was studied collaboratively. Biphenyl is separated from fruit tissue by steam liquidliquid extraction. The ra-heptane extract is subjected to preparative thin layer chromatography (TLC) on plates coated with silica gel containing phosphors for ready visibility of the biphenyl spots under UV light. The spots are removed from the plate and extracted with alcohol for spectrophotometric measurement at 248 mμ. The TLC cleanup adds specificity to the method; o-phenylphenol, if present, does not interfere and crop blanks are insignificant. The average of 36 recoveries (12 each at abovit 100, 50, and 10 ppm) was 96.7% with a mean deviation of 10.7%. It is recommended that the method be adopted as official, first action.

Determination of Oxidative Metabolites of Dimethoate and Thimet in Soil by Emission Spectroscopic Gas Chromatography

1966 ◽  
Vol 49 (3) ◽  
pp. 647-650
Author(s):  
C A Bache ◽  
D J Lisk
Keyword(s):  
Gas Chromatography ◽  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Preparative Thin Layer Chromatography ◽  
Oxidation Products ◽  
Oxygen Analog ◽  
Oxidative Metabolites ◽  
Layer Chromatography

Abstract The conversion of dimethoate to its oxygen analog and the production of oxidative metabolites of Thimet in soil has been shown by using emission spectroscopic gas chromatography for their determination. Preparative thin layer chromatography was vised for prior separation of Thimet oxidation products. The sulfoxide and sulfone of Thimet were the major determinable products.

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