Albumoses secondary

Deutero-albumoses (Secondary albumoses) Deutero-albumoses... 

Kiihne and Chittenden have distinguished two classes of albumoses primary albumoses, which precipitate by NaCl saturation in neutral media, and the secondary albumoses or deutero-albumoses, which do not precipitate by NaCl saturation except in acid solution, and then incompletely. Moreover, primary albumoses are divided into ketero-albumoses, insoluble in pure cold water, but soluble in dilute salt solutions, and, consequently, precipitable by dialysis, and proto-albumoses, soluble in pure water and dilute salt solutions. 

These results are very favorable to the method of fractional precipitation. Primary albumose and deutero-albumose B are the products which are first formed deutero-albumose A appears as a secondary product and deutero-albumose C only as a final product of the reaction. This fraction is formed with difficulty in the presence of acids and is not met in appreciable quantity except in the last phases of peptonization. 

Plastein was first obtained with the products of hydrolysis of nitrogenous matter under the influence of pepsin or trypsin, but the products formed by the moderate action of acids or alkalis can serve just as well. The products of advanced hydrolysis by trypsin or acids yield no plastein, or only a very little. According to Kurajeff, the different proteolytic enzymes do not act equally well in the same media. Papayotin gives an abundant deposit of plastein with secondary albumose and very little with primary albumose, while rennet, on the contrary, gives much plastein with the primary and little with the secondary. Below, according to Henriques, is the comparative action of enzymes on the different products of albuminoid hydrolysis ... 

Zunz has made similar observations in the case of albumoses. As is well known albumoses are decomposition products of e albumin and are produced dirring digestion. They are more closely related to albumin than are the peptones, and manifest great differences in diffusion in that primary albumoses diffuse with difficulty while the secondary albumoses diffuse easily. The primary albumoses are more easily precipitated by ammonium sulfate than are the secondary. To the primary albumoses belong heteroalbumoses soluble only in dilute salt solutions, protalbumoses soluble in pure water, and synalbumoses. The gold numbers found by Zunz for the three decomposition products are as follows ... 

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