Determination of Free Ammonium and Asparagine and Glutamine Amide-Nitrogen in Extracts of Plant Tissue 1

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A relatively simple and rapid procedure for the measurement of free ammonium and the amides in plant extracts is described. The method was developed by combining a cation-exchange method for blood ammonia with a differential acid-hydrolysis procedure for asparagine and glutamine amide-nitrogen.

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