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.

The paper summarizes the research progress on the production technologies of erythorbic acid and its sodium salt,the main problems and corresponding solutions of the domestic erythorbic acid and its sodium salt production.

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.