Aldonic acids enzyme catalyzing

With glucose, chemical oxidation of C-l occurs with the open-chain form, whereas enzyme-catalyzed oxidation of C-l occurs with the ring form of the sugar. The aldonic acid (gluconic acid) that is formed is an equilibrium mixture of the free acid (open chain) and the 5-lactone (ring). 

During the course of studies on the microbial production of chiral intermediates for D-pantothenic acid [2,134,135], Shimizu and co-workers found that several micro-organisms, such as Fusarium, Brevibacterium and so on, produce a novel enzyme that catalyzes the hydrolysis of aldonate lactones or aromatic lactones [136, 137],... 

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