Catalysts of Organic and Inorganic Origin. 289 





Katalase 

 action. 



3 

 3 



'c3 

 3 



Ursol 

 tartrate. 



"o 



1) 

 ou 







Sh 

 ^» 







a 

 , 

 6 a 



Ik 



M 



h 



Gallic acid. 



Grallotannic 

 aeid. 



Tyrosin. 



Ferrous chloride ... 





+ 















\ \ , . XT r\ 

 VO. + XL 2 U 2 ... 



+ + +* 



+ + 



+ + 



+ + 



+ + 



+ + 



+ 



+ 



Potassium ferro- 



















cyanide 



















JJO. + Il2(J-2 ■ ■ ■ 



+ t 



4 + + 



+ + 



+ + 



+ 



+ + 







Potassium ferri- 





+ 



+ + 



+ + 





+ 







cyanide 



















Do. + ii 2 (J 2 ... 





+ + + 



+ + + 



+ + + 



+ + 



+ + 







Manganese chloride 

 (^IvlnOloJ 









+ 



























Tin * J.TT D 

 DO. -r Xl 2 W 2 ... 





-r r 



+ 



+ + 



+ 



+ 







Manganese sulphate 



















(MnS0 4 ) 



















Do. + xi 2 U 2 ... 





+ + 



+ + 



+ 



+ 



+ 







Potassium perman- 





+ + + 



■V + + 



+ 



+ 



+ + 





+ + 



ganate 



















Do. + H 2 2 ... 



+ + + 



+ + + 



+ + + 



+ + 



+ + 



+ 



+ 





Black oxide of man- 





+ + 



+ + + 



+ + + 



+ 



+ + 







ganese 



















DO. + ±i 2 U 2 ... 



+ + + 



+ + + 



+ + + 



+ + 



+ + 



+ 







Chromium chloride 



















Do. + H 2 2 ... 



Nil 



Nil 



+ + 



+ + 



+ + 



+ 



+ 



+ 



Chromic acid 





+ + + 



+ + 



+ + + 



+ + 



+ + + 



+ + + 





Do. + H 2 2 t 



+ + + 



+ + + 



+ + + 



+ + + 



+ + 



+ + 



+ + 



+ 



Potassium bichro- 





+ + + 



+ + 



+ + 



+ 



+ + + 







mate 



















Tin 4- TT f)„+ 



+ + + 



-J- + •+■ 



+ + + 



_l_ _i_ _i_ 





+ + 



+ + + 



+ 



" Neutral " potas- 









+ 











sium phosphate§ 



















Do. +H 2 2 ... 



Nil 



Nil 



+ 



+ 



+ 













+ + + 



+ 



+ + + 



+ + 



+ + 



+ 





Do. +H 2 2 ... 









+ + 





+ 

























Do. +H 2 2 ... 



+ 



+ + + 



+ 



+ + 



+ 



+ 



+ 





* Ferric salt formed, hence the oxidase reactions -with H 2 2 the same as with, ferric chloride. 



t H 2 2 converts ferrocyanide partly into ferricyanide. Hence ferrocyanide and H 2 2 give 

 similar oxidase reactions to the ferricyanide. Similarly traces of ferricyanide appear slowly in a 

 solution of ferrocyanide exposed to light and the liquid becomes a deeper yellow, while ultimately 

 prussian blue separates out. According to Sarthou (' Journ. Pharm. Chim.,' vol. 1, p. 482, 1900), 

 the bark of Schinus molle contains a ferment " schinoxidase " which converts potassium ferro- 

 cyanide into ferricyanide. It is, however, very doubtful in this case that we are dealing with an 

 oxidase ferment at all. 



X With dilute solutions the colour change with hydroxyl is easily distinguished from the 

 oxidase change by using controls. A mixture of dilute OrO :j and H 2 2 becomes colourless again 

 on long standing. 



§ Made by adding potassium carbonate to a boiling solution of acid potassium phosphate until 

 imperceptibly acid or alkaline to litmus. 



The foregoing Table shows clearly that an inorganic oxidase is not 

 necessarily a "katalase," nor a katalase an oxidase, and that hydrogen 

 peroxide may accelerate the oxidase action of substances incapable of 

 decomposing it. 



In the case of nitric acid, chromic acid and potassium permanganate the 



