Abstract
This work was undertaken to determine the difference among reactivities of different kinds of DNP-amino acids with Cr salt. The solutions were prepared by adding each solution of several kinds of DNP-amino acids to S02-reduced liquor respectively. After allowing to stand, the amounts of DNP-amino acids combined with Cr were determined. The determination of the amount of combined DNP-amino acid, which was not extracted with ether, was made by the difference in the amounts of uncombined DNP-amino acids varing with time of reaction. The amount of uncombined DNP-amino acid was calculated from the difference in absorbancies which had been measured at a wave length of 350mμbefore and after extraction with ether.The difference among their reactivities was evaluated by comparison with their combined amounts. The results obtained are as follows :1. The amino acid with more carbon atoms per molecule did not combine easily with Cramong several kinds of the DNP-amino acids. 2. The amount of DNP-serine combined with Cr was greater, because of presence of OH group within that molecule, than the amount of DNP-alanine. 3. Monoamino dicarboxylic acid combined with Cr much more than monoamino mono-carboxylic acid at a range of higher pH in the acidic solution.
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