Heat degradation of gelatin

A study has been made of the degradation of gelatin prepared by the alkaline process and the acid process. Heat has rather more effect on acid process gelatin. Both types show the least break‐down at neutrality, and heating at a high PH is more Hamming than heating at a low PH. The extent to which the physical properties arc destroyed is independent of concentration, but increases with rise in temperature at a rate which is rather more than in proportion to the temperature increments. The initial period of heating produces the greatest effects. The loss of ammonia when gelatin is heated in the presence of alkali, formal titration figures on heated gelatin, and a knowledge of the method of preparation, have been used to develop a theory explaining the relation of the two kinds of gelatin to collagen.