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An HPLC method with photodiode array detection for simple and rapid determination of urea in physiological fluids of domestic animals has been described. A physiological fluid (blood plasma, urine, or milk) was treated with 20% trichloroacetic acid and then the mixture was centrifuged. 200 μL of the supernatant were derivatized using 50 uL of p-dime-thylaminobenzaldehyde (DMAB) dissolved in HC1 (1...
Positional and geometric isomers of geometric isomers of linoleic acid (CLA) were separated from interfering species on commercially available two reversed-phase C18-columns (Nova Pak, Waters) in gradient systems composed of acetonitrile and water, utilizing photodiode array detection. The biological samples were hydrolyzed with 2 M NaOH for 35 min at 85°C. After cooling, the hydrolysates were acidified...
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