The micro-determination of glycine in protein hydrolysates

THE separation of the amino-acids obtained on protein hydrolysis into three fractions by means of the differing solubilities of their copper salts as indicated in previous publications [Town, 1928; 1936] is generally satisfactory in that the amino-acids are largely found in those fractions to be expected from the known properties of their copper salts. Overlapping due to the formation of mixed copper salts and to changes in the solubility of the copper salts due to the presence of other soluble salts occurs only to a very small extent.