Cereal Chem 46:570 - 579.  |  VIEW ARTICLE
Interaction Between Protein and Starch.

I. Takeuchi. Copyright 1969 by the American Association of Cereal Chemists, Inc. 

The electrolytic conductance of mixed solutions composed of 5 ml. of alpha-casein solution and different levels of acidified potato starch solution was determined. When the results were represented by a straight line, an intersection appeared on the figure of electrolytic conductance against the volume of the starch solution. The results agreed well with the hypothesis of Terayama (J. Chem. Soc. Japan 78: 1261; 1957), who proposed that the equivalent point of opposite charges of two high-polymer ions could thus be shown. The equivalent value obtained by the electrolytic conductance measurement agreed well with the equivalent value calculated from the charges of the protein and the starch, defined by the colloid titration method. The combination of the protein and the starch by their opposite charges was thus verified.