536 MARINE PRODUCTS OF COMMERCE 



Table 116. Nitrogenous Constituents of Russian Isinglass. 



Per Cent 

 Protein N 91.0 



Proteose N 4.4 



Peptone N 4.5 



Amino acid N 0.1 



Total 100.0 



Distribution of Amino-Acid Groups In Protein of Russian Isinglass 



Total 99.49 



The isinglass is then strained through linen and stirred into the bulk of the wine. 

 As the solution is not heated, the isinglass does not dissolve. Thus, although the 

 isinglass is disintegrated into a finely divided suspension, its original fibrous struc- 

 ture is not destroyed. As this finely divided suspension settles slowly to the bottom, 

 it entangles in its netlike meshes the colloidal bodies that produce undesirable 

 turbidity in the wine. Only a small amount of isinglass is required to clarify a 

 large quantity of wine: a single ounce of isinglass will usually clarify 200 to 500 

 gallons of wine in 8 to 10 days. 



Formerly isinglass was used for the preparation of edible jellies and in the 

 manufacture of confectionery; but since high-grade gelatin is now relatively in- 

 expensive, this use has become obsolete, as have also most of the uses of isinglass 

 as an adhesive and as a size. 



Isinglass is still used to a limited extent in the manufacture of court plaster. 

 Other uses are in the preparation of special cements, as a constituent of a water- 

 proofing composition, and for various other miscellaneous purposes. 



REFERENCES 



Bogue, R. H., "Properties and Constitution of Glues and Gelatin. IV," Chem. Met. Eng., 

 23, 154-158 (1920). 



Bogue, R. H., "Isinglass," Chem. Age., 30, 183-184 (1922). 



Bogue, R. H., "Chemistry and Technology of Gelatin and Glue," New York, McGraw- 

 Hill Book Co., 1922. 



Delmonte, J., "Technology of Adhesives," New York, Reinhold Publishing Corp., 1947. 



Feener, S. L., and McFee, E. P., "By-products of the Fishing Industry," Food Technology, 

 3, 211-212 (1949). 



Lovern, J. A., "By-products of the Fishing Industry," Chem. and Ind., 56, 75-81 (1937). 



Smith, L. F., "The Production of Glue from Fish Waste," Fisheries Research Board 

 Canada, Prog. Repts., Pacific Coast Stations, 3, 5-8 (1929). 



