580 



PHYSIOLOGICAL CHEMISTRY 



also for total nitrogen. Calculate your results and tabulate the data as shown in 

 table on page 579. 



Did the sucrose influence the catabolism of protein in your body? 



19. Hydrogen Ion Concentration of the Urine as Influenced by 

 the Ingestion of Acid-Forming and Base-Forming Foods. It has been 

 demonstrated by Sherman and Gettler 1 that vegetables and fruits, 

 on burning, leave an ash in which the basic elements (sodium, potassium, 

 calcium and magnesium) predominate, whereas cereals, meats and fish 

 foods leave an ash in which the acid-forming elements (chlorine, sulphur 

 and phosphorus) predominate. A list of acid-forming and base- 

 forming foods is given in the following table. 



EXCESS OF ACID-FORMING OR BASE-FORMING ELEMENTS IN FOODS 



(Sherman and Gettler) 



1 Sherman and Gettler: Jour : Biol. Chem., n, 323, 1912. 



2 Prunes, plums and cranberries yield an alkaline ash but serve to increase the hydrogen 

 ion concentration of the urine because of their benzoic acid content, this acid being syn- 

 thesized with glycocoll in the kidney and elsewhere to form hippuric acid. 



