Region of_ 

 Gelatin-N03 



Isoelectric 



point 

 Pare gelatin 



■Region of 

 Ag-Gelatinate 



70 



GO 

 50 

 40 

 30 

 2( 



(0 

 ZQO 

 175 

 15.0 

 i25 

 lo.O 

 7.5 

 5.0 

 25 







200 



175 



150 



125 



100. 



75 



50 



25 







6 



5 



4 

 3 

 2 



Fig. 3. Gelatin treated first with m/16 AgNOs, washed, then treated with dif- 

 ferent concentrations of HNO3, and washed again. Curves for conductivity, 

 osmotic pressure, alcohol number, and swelling. On the right from the iso- 

 electric point the gelatin exists as silver gelatinate, on the left as gelatin nitrate, 

 and at the isoelectric point as pure, sparingly soluble gelatin. 



243 



