ENERGY SUPPLY OF THE CELL 47 



different combinations, and the number of different 

 reactions is quite small. The following list of basic 

 reactions is given by Kluyver and Donker: 



BASIC REACTIONS IN SUGAR FERMENTATIONS 



I. CHANGES OF METHYL GLYOXAL HYDRATE 



/OH /OH 



la. CH3-C0-C— OH = CHs'CO-C— 0— H = 



Methyl glyoxal V \. 



CH3-CH0H-C00H 



Lactic acid 



/OH /OH 



lb. CHs-CO-C— OH = CH3-C0-C— 0— H = 



\h \h 



ch3cho + hcooh 



Acet aldehyde Formic acid 



/OH /OH 



Ic. CHs-CO-C— OH = CH3-C0-C— 0— H = 



\h \h 



CHs-CO-COOH + 2H = Acceptor 



Pyruvic acid 



= CHg-CHO + CO2 



Acet aldehyde 



II. CONDENSATIONS 

 ^OH H\^ 



Ila. CH3-C— OH + CCH3 = 



/^Acet a 



H O 



/Acet aldehyde 



Acet aldehyde 



/OH Us 



CH3C— OH + C-CHs = CH3COCHOHCH3 



\h 



^ Acetyl methyl carbinol 



