6BOTTCHER A, CURSKI H, KUNTZE T. Manufacture of L- ascorbic Acid[P]. EP : 1048663,2000-11-02.
7Ahmedbad Textile Industry Research Assoc. Synthesis of Ascorbic Acid from 2,3,4,6-di-ο-isopropylidene-2-keto-L-gulonic Acid Monohydrate[P]. IN, 149287,1981-10-17.
8YODICE R. Production of L-ascorbic from 2-keto-L-gulonic Acid[P]. US: 764246,1985-08-09.
9MURPHY A P, HENTHOME L R. Process and Catalysts for a One-step Synthesis of Vitamin C[P]. US: 5998634,1999-12-07.
10FECHTEL U, HEINZ W,MULLER B,et al. Production of L-ascorbic Acid[P]. DE,19904821,2000-07-06.
