oktw says to #ysitd
<licson>: 如何把 Glucose 變成 Ascorbic Acid 1. D-Glucose -> 2-keto-L-gulonic acid by E. Coli Fermentation 2. 2-keto-L-gulonic acid -> D-sorbital by E. Coli fermentation 3. D-sorbital -> L-ascorbic acid by E. Coli fermentation