Pfizer Handbook of Microbial Metabolites 26 



23 2,5-Diketogluconic Acid, CgHgOT, isolated as Ca salt. No good 



m.p. 



COOH 



I 



c=o 



HOCH 

 HCOH 



c=o 



I 

 CH.OH 



Acetobacter melanogenum, Pseudomonas, Phytomonas 

 spp. 



H. Katznelson, S. W. Tanenbaum and E. L. Tatum, J. Biol. 

 Chem. 204 43 (1953). 



24 Glucosone, CgHioOe, levorotatory syrup with reducing properties. 



CHO 



c=o 



I 

 HOCH 



HCOH 



HCOH 



CHoOH 



Aspergillus parasiticus, A. fiavus, some algae 

 Yields of 13-17% from sucrose have been reported. 

 Cecil R. Bond, Edwin C. Knight and Thomas K. Walker, 

 Biochem. J. 31 1033 (1937). 



Ross C. Be_an and W. Z. Hassid, Science 124 171 (1956). 



25 2-Ketogluconic Acid, C^HioO^, colorless crystals, m.p. 152° (Me 



ester, m.p. 172°). 



COOH 



c=o 



1 

 HOCH 



HCOH 



HCOH 



CH2OH 

 Acetobacter melanogenum, Pseudomonas, Phytomonas 

 spp. 



