Probable Absence of Citrulline from Proteins

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Abstract
Although casein, arachan, amandin, myosin, and the crystalline globulins from pumpkin and watermelon seeds all give biacetyl monoxime tests for "citrulline," their hydrolysates are negative in this test. Citrulline itself is relatively slowly destroyed by 6 unspecified HC1 at 110[degree]C. Only traces of "citrulline" are found in tryptic-ereptic hydrolysates of these proteins; citrulline added to such hydrolysates, however, gives color values corresponding to several hundred per cent recovery. These findings make it appear improbable that citrulline is a constituent of these 6 proteins.
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