2-Oxogluconic acid

The presence of 2-oxogluconi and 5-oxogluconic acids in red wines, sometimes at fairly high concentrations in wines made from spoiled grapes (Flanzy, 1998), results in colors that shift rapidly toward orange tones. This is probably due to a reaction between these acids and anthocyanins, by fixing the polarized double bond on C4 (Section 6.3.9). 

The oxidation of secondary hydroxyl functions to the carbonyl group is often an undesired side reaction. However, the oxidation of D-gluconic acid to 2-oxogluconic acid is a highly selective process (97% yield) when a Pt-Bi catalyst is employed.89 Such a procedure is of industrial interest. 

OXOGLUCONIC ACID. ChHjoO. Aluminum alloys have been used in the fermentation process of oxogluconic acid. 

Sponholz, W.R., Dittrich, H.H. (1985). Origin of gluconic acid, 2- and 5-oxogluconic, glucuronic and galacturonic acids in musts and wines. Vitis, 24, 51-58. 

D-arabino-Hexulosonic acid, methyl ester, D-arabino-2-Hexulosonic acid, methyl ester EINECS 244-187-9 Methyl 2-keto-D-gluconate Methyl 2-oxogluconate. 

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