Abstract
A fluorometric method for the automated determination of the imino acids proline and hydroxyproline has been developed. The assay is based on the postcolumn reaction of the imino acids with alkaline sodium hypochlorite, which yields oxidation products amenable to detection with fluorogenic amine reagents. The method is simple and can be adapted readily to high-sensitivity amino acid analyzers which use o-phthalaldehyde for detection. As little as 10 pmol proline and 20 pmol hydroxyproline can be determined accurately. Thus the full array of natural imino and amino acids can now be determined on a high-sensitivity amino acid analyzer using o-phthalaldehyde.
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