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- W1981308132 abstract "The literature is abundant with examples of the remarkable versatility of chromatography for the detection and separation of a wide variety of ureas and thioureas. Thin-layer chromatography with its inherent simplicity of operation, rapidity, high degree of sensitivity and resolution (and utility for “pre-cleanup” prior to gas chromatographic analysis) is rapidly replacing paper chromatography. Gas chromatography is becoming more useful as a method for analyzing residues of compounds of pharmaceutical and agricultural interest in plants, soils and animal tissues and fluids. Its ability for the simultaneous determination of several components, such as isomers, homologs and metabolites during a single operation has been amply demonstrated. The utility of gas chromatography will increase with the possibility of decreasing the thermal instability of ureas by the preparation of suitable derivatives such as trimethylsilyl 121 , or possibly acetyl derivatives 193 (successfully utilized for pesticidal carbamates). The desirability of a satisfactory selective system for nitrogen as suggested by C oulson 194 as well as the use of pyrolytic techniques 195,196 (utilized in combination with gas chromatography for the analysis of barbiturates) appears to offer enhanced prospects for the greater utility of gas chromatography to urea and thiourea analysis." @default.
- W1981308132 created "2016-06-24" @default.
- W1981308132 creator A5004428134 @default.
- W1981308132 creator A5008813618 @default.
- W1981308132 creator A5033888083 @default.
- W1981308132 date "1968-05-01" @default.
- W1981308132 modified "2023-09-25" @default.
- W1981308132 title "Chromatography of ureas thioureas and related mammalian metabolites" @default.
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