Analytical Chemistry Insights
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Identification and Quantitation of Asparagine and Citrulline Using High-Performance Liquid Chromatography (HPLC)
Authors: Cheng Bai, Charles C. Reilly and Bruce W. Wood
Publication Date: 28 Mar 2007
Analytical Chemistry Insights 2007:2 31-36
Cheng Bai, Charles C. Reilly and Bruce W. Wood
United States Department of Agriculture, Agricultural Research Service, South Atlantic Area, Southeast Fruit and Tree Nut Research Laboratory, 21 Dunbar Road, Byron, Georgia 31008.
Abstract: High-performance liquid chromatography (HPLC) analysis was used for identification of two problematic ureides, asparagine and citrulline. We report here a technique that takes advantage of the predictable delay in retention time of the co-asparagine/citrulline peak to enable both qualitative and quantitative analysis of asparagine and citrulline using the Platinum EPS reverse-phase C18 column (Alltech Associates). Asparagine alone is eluted earlier than citrulline alone, but when both of them are present in biological samples they may co-elute. HPLC retention times for asparagine and citrulline were influenced by other ureides in the mixture. We found that at various asparagines and citrulline ratios [= 3:1, 1:1, and 1:3; corresponding to 75:25, 50:50, and 25:75 (μMol ml–1/μMol ml–1)], the resulting peak exhibited different retention times. Adjustment of ureide ratios as internal standards enables peak identification and quantification. Both chemicals were quantified in xylem sap samples of pecan [Carya illinoinensis (Wangenh.) K. Koch] trees. Analysis revealed that tree nickel nutrition status affects relative concentrations of Urea Cycle intermediates, asparagine and citrulline, present in sap. Consequently, we concluded that the HPLC methods are presented to enable qualitative and quantitative analysis of these metabolically important ureides.
Categories: Analytical chemistry
Keywords: HPLC identification, pecan, ureides, asparagine, citrulline.
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