Ill] 



PLANT ENZYMES 



21 



ing to the reaction they catalyze, e.g. hydrolytic, oxidizing, etc., as 

 follows : 



Hydrolysis 

 Enzyme Substrate Products 



Lipase (p. 94) 

 „ (p. 99) 



Chlorophyllase (p. 34) 

 Phytase (p. 102) 

 Gly cerophosphatase 



(p. 99) 

 Diastase (p. 75) 

 Invertase (p. 78) 

 Maltase (p. 77) 

 Inulase (p. 60) 

 Cytase (p. 71) 

 Emulsin (p. 160) 



Myrosin (p. 164) 



Pepsin (p. 152) 

 Erepsin (p. 152) 



Peroxidase (p. 122) 

 Oxygenase (p. 122) 

 Tyrosinase (p. 128) 



Catalase (p. 129) 

 Reductase (oxido-re- 

 ductase) (p. 129) 



Hexosephosphatase 



(p. 22) 

 Zymase (p. 22) 

 Carboxylase (p. 22) 



Urease (p. 181) 

 Pectase (p. 67) 



Fats 

 Lecithin 



Chlorophyll 



Phytin 



Glycerophosphoric acid 



Starch 



Cane sugar 



Maltose 



Inulin 



Hemicellulose 



Amygdalin 



Sinigrin 



Proteins 

 Peptones 



Fatty acids and glycerol 



Fatty acids, glycero-phosphoric acid 



and choline 

 Chlorophyllide and phytol 

 Inositol and phosphoric acid 

 Glycerol and phosphoric acid 



Dextrin and maltose 



Dextrose and laevulose 



Dextrose 



Laevulose 



Mannose and galactose 



Benzaldehyde, prussic acid and 



glucose 

 Allyl isothiocyanate, potassium, 



hydrogen sulphate and glucose 

 Albuminoses and peptones 

 Polypeptides and amino -acids 



Oxidation and reduction 



Hydrogen peroxide 

 Catechol, etc 

 Tyrosine 



Hydrogen peroxide 

 Water 



Atomic oxygen 

 Peroxide 



Melanin, ammonia and carbon di- 

 oxide 

 Molecular oxygen 

 Hydrogen and oxygen 



Respiration (and fermentation) 



Hexosephosphate 



Hexose 



Pyruvic acid, etc. 



Hexose and phosphoric acid 



Alcohol and carbon dioxide 

 Acetaldehyde and carbon dioxide 



Other reactions 



Urea 

 Soluble pectin 



Ammonia and carbon dioxide 

 Cytopectic acid 



Most of these various classes of enzymes will be dealt with in detail 

 in connexion with the chemical substances on which they react. 



An excellent demonstration of the fact that a single cell may contain 

 all the various enzymes connected with the processes of metabolism is 

 afforded by the unicellular Fungus, Yeast (Saccharomyces), of which many 



