IN ISO-ELECTRIC REACTION 



59 



on albumin (from ox-serum) and on glutin, both carefully 

 dialysed for many weeks. 



Table 8. 



Glutin A (" deutsche Goldmarke"). 

 i per cent, final concentration N/ioo acetate. 





Acetic acid acetate mixtures were used as hydrion 

 regulators ; the degree of flocculation is indicated by crosses.* 



Experience has shown, fur- 

 ther, that the maximum of 

 neutral particles is also ex- 

 pressed in a minimum value 

 of the viscosity, corresponding 

 to the general difference of 

 viscosity between neutral and 

 ionised protein particles. 



Fig. 6 (from a research by 

 Pauli and Matula f) shows 

 the depression in viscosity at 

 the iso-electric point in the 



1-50 



FIG. 6. Viscosity of glutin at the 

 iso-electric point. 



case of a i per cent, glutin at *_^ p 



35, with acetic acid acetate H 



mixture. 



There is good agreement in 

 this instance, as in similar investigations (e.g., with serum 

 containing globulin), between the viscosity minimum and the 



* slight, deeper, very deep turbidity. The signs 

 -K H (-, + H K indicate visible formation of precipitate of the same 

 degrees of opacity. 



f Kolloid Zeiisch., 1913, 12, 222. 



