Hint | Food | ¸À°úÇâ | Diet | Health | ºÒ·®Áö½Ä | ÀÚ¿¬°úÇÐ | My Book | À¯Æ©ºê | Frims | ¿ø ·á | Á¦ Ç° | Update | Site |
¿ø·á ¡í ºñŸ¹Î ¡í ºñŸ¹Î C ºñŸ¹ÎC : ÇÕ¼º ½Ä¹°ÀÇ Vitamin C õ¿¬ÇÕ¼º ÈÇÐÀû(»ê¾÷Àû) ÇÕ¼º hydrogenation of D-glucose to D-sorbitol, an organic reaction with nickel as a catalyst under high temperature and high pressure. Microbial oxidation or fermentation of sorbital to L-sorbose with acetobacter [1] with pH 4-6 and 30 ¡ÆC. protection of the 4 hydroxyl groups in sorbose by formation of the acetal with acetone and an acid to Diacetone-L-sorbose (2,3:4,6−Diisopropyliden−¥á−L−sorbose) Organic oxidation with potassium permanganate followed by heating with water gives the 2-Keto-L-gulonic acid The final step is a ring-closing step or gamma lactonization with removal of water .[2] Intermediate 5 can also be prepared directly from 3 with oxygen and platinum |
||||
|
|
|||