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- W997835296 abstract "Publisher Summary The method for determination of α-keto acids are based on the observations that the p-nitrophenylhydrazones of keto acids are soluble in, or are extracted from organic solvents by, Na 2 CO 3 solution and yield brilliant red to purple colors on addition of strong alkali. These properties of hydrazones are adapted to the determination of microgram quantities, using reaction with 2,4-dinitrophenylhydrazine, extraction of hydrazones by ethylacetate, re-extraction by 10% Na2CO3 solution, addition of N NaOH, and photoelectric determination of color density. In the procedures discussed in this chapter the separate determination of keto acids is based on differences in the rates of reaction with 2,4-dinitrophenylhydrazine, on the distribution of the hydrazones in the aqueous phase and various solvents, and, to some extent, on differences in light absorption of the hydrazones in alkali. The monocarboxylic acid hydrazones are preferentially extracted from acid aqueous solution by aromatic hydrocarbons; the dicarboxylic acid hydrazones by aliphatic and aromatic alcohols. Both groups of hydrazones are readily extracted by esters and ethers." @default.
- W997835296 created "2016-06-24" @default.
- W997835296 creator A5000746384 @default.
- W997835296 date "1957-01-01" @default.
- W997835296 modified "2023-10-16" @default.
- W997835296 title "[66] Determination of α-keto acids" @default.
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- W997835296 doi "https://doi.org/10.1016/s0076-6879(57)03406-0" @default.
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