60 
OXIDASE AND PEE OXIDASE REAGENTS. 
I nder this head are 2;iven the names of the sweater number of 
reagents which have been actually employed in the study of oxidases, 
peroxidases and other oxygen catalysts occurring in the living 
organism. As will be seen the greater number of these substances 
belong to the aromatic series, and on oxidation by the oxidase or 
peroxidase give rise to a colored substance: thus, guaiaeum is con- 
verted into guaiaeum blue, phenolphthalin into phenolphthalein. which 
is red in alkaline solution, the leuco-base of malachite green into mala- 
chite green, guaiacol into guaiacol-tetraquinone [C 6 II 3 (OCH 3 ) Oj 4 , 
which is red in color. Xo attempt has been made to classify these 
reagents either as to chemical constitution or according to the nature 
of the substance which they yield on oxidation by the oxidase or 
peroxidase. 
Table of oxidase and peroxidase reagents. 
Name of substance. References. 
Guaiaeum 51. 74, 135, 136, 332, 
377. 384, 417. 418, 
419. 
Guaiaeonic acid 142, 362. 
Guaiacol 75. 76. 
Hydroquinone 48. 49. 76. 
Aloin 238, 251, 363, 364. 
Phenolphthalin 240. 247. 334. 335, 
Erhyl-phenolphthalin 238. 245. 
Leuco-rosolic acid 245. 
Leuco-base of malachite green 11. 104. 105. 131. 193. 
Tyrosin 64, 77, 78. 
Benzidin 11, 390. 
Pyrogallol 30, 31. . 
Potassium iodide and starch 19. 377, 379, 414. 
Tetramethyl-para-phenylene diamin 464. 
Para-phenylene diamin 444. 
Para-diethyl-para-phenylene diamin 437. 
a-naphthol 77, 194. 
a-naphthyl am in 390. 
Vanillin 210, 266, 390. 453. 
Phenol 11. 76. 
Pyroeatechin 11. 
Ortol 43. 
Amidol 258. 
Tannin 272. 
Salicylic aldehyde 5. 225. 291, 292, 366. 
Benzyl alcohol 366. 
Formic aldehyde 329. 
Arsenious acid 40S. 
Pvramidon 252. 
a-naphthol and para-phenylene diamin in solution in sodium 
carbonate, and analogous reagents 
Eugenol 
Iso-eugenol 
351. 453. 
76. 125. 
126. 
