Collected papers . ion of reaction velocityto hydrogen-ion concentration can be arrived at by such experimentsas those published in our previous paper. The conditions are too 1 We also have evidence that in more acid solution still (hydrogen-ion concentrationequal to 4000 x IQ-^ normal) an increase of only 15 /^ in concentration of hydrogeu-ionswas sufficient to double the average velocity of coagulation. HEAT COAGULATION OF PROTEINS. 3 complicated. Both the concentration of protein and the concentrationof acid are changing all the time as the separation of protein from thesolution takes with
Collected papers . ion of reaction velocityto hydrogen-ion concentration can be arrived at by such experimentsas those published in our previous paper. The conditions are too 1 We also have evidence that in more acid solution still (hydrogen-ion concentrationequal to 4000 x IQ-^ normal) an increase of only 15 /^ in concentration of hydrogeu-ionswas sufficient to double the average velocity of coagulation. HEAT COAGULATION OF PROTEINS. 3 complicated. Both the concentration of protein and the concentrationof acid are changing all the time as the separation of protein from thesolution takes with it acid or what amounts to the same thing possiblysets free abase. All we can claim for these experiments is that theyshow changes in acidity, in the region where concentration of hydrogen-ions is equal to 10~^ normal to 10 normal, to exert a very potentinfluence upon the reaction rate, which accounts for the old establishedobservation that increase of acidity lowers the coagulation temperatureof protein Fig. 1. Kelation between average velocity of egg-albumen coagulation (in 1 /^ solution)and concentration of hydrogen-ions in the solution. Ordinates = concentration of hydrogen-ions in terms of normality ( x 10^).Abscissae = average velocity of coagulation in mgs. per Heat coagulation of egg-albumen a reaction of the first order whenprecautions are taken to maintain concentraiion of hydrogen-ionsconstant. Enough has been said to show that it is hopeless to attempt toascertain the nature of the reaction between hot water and egg-albumenunless the concentration of hydrogen-ions can be maintained constantduring the observations. Our first endeavour to arrive at such constancy was to introduce asmuch as possible of a weakly ionised acid, such as butyric acid, in the 1—2 4 H. CHICK AND C. J. MARTIN. hope that the amount of acid withdrawn during coagulation would notmaterially diminish the concentration of hydrogen-ions, in other wordsthat the large un-ionised frac
Size: 1796px × 1392px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisherlondon, booksubject
