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- W2069588988 abstract "Abstract Numerous chromatographic methods have been developed to detect α-keto acids in physiological or sea-water samples. These methods generally involve derivatization in a strongly acidic medium with elevated temperatures, desalting, preconcentration, and liquid-liquid extraction procedures prior to chromatographic analysis. These procedures may introduce significant errors because of adsorption losses, contamination, or decomposition of the α-keto acids. To avoid these potential problems, a chemically mild method to detect α-keto acids in sea water was developed. The method is based on the reaction of α-keto acids with 2,4-dinitrophenylhydrazine in sea water to form stable hydrazone derivatives. Desalting of the reaction mixture and preconcentration of the hydrazone derivatives is accomplished by a column-switching technique. The derivatives are separated by reversed-phase, high-performance liquid chromatography and detected by absorption spectrometry. Quantification of α-keto acids in the nM to μM concentration range shows complete recovery in sea water, excellent precision at 10–20 pmol (" @default.
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- W2069588988 title "Trace determination of α-keto acid in natural waters" @default.
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