2-Keto-D-gluconic acid(2KGA),usually prepared by fermentative oxidation of D-glucose,is the precursor used in the manufacture of sodium erythorbate or erythorbic acid as a food antioxidant.

The effects of various filtration materials used in the purification of sodium erythorbate on product quality were investigated.

Treatment for D-sodium ascorbate industrial wastewater by combined biotechnology;

Five long-chain saturated alkanoyl-6O-D-isoascorbates(alkanoyl=decanoyl,lauroyl,myristoyl,palmitoyl and stearoyl) were synthesized by esterification(or transesterification) of D-isoascorbic acid with alkanoic acids using concentrated H_2SO_4 as a medium and a catalyst at room temperature.

Seven n-alkyl aldehyde acetals of D-isoascorbic acid(3a～3g) were synthesized by the reaction of D-isoascorbic acid with n-alkyl aldehyde using p-toluene sulfonic acid as a catalyst, dimethyl acetamide as a solvent, cyclohexane as a water carrying agent.