title: The forms of vitamin B12 in foods.
abstract: 1. The forms of vitamin B12 were determined in foods, most of which had been prepared for consumption. 2. Five forms were detected: adenosylcobalamin, hydroxocobalamin, methylcobalamin, cyanocobalamin and sulphitocobalamin. Adenoxylcobalamin and hydroxocobalamin were the predominant forms. 3. The intestinal absorption of [57Co]sulphitocobalamin was estimated and found to be lower than that of [58Co]cyanocobalamin.
mesh_terms: D000328:Adult; D000368:Aged; D000818:Animals; D002611:Cheese / Q000032:analysis; D055598:Chemical Phenomena; D002621:Chemistry; D003037:Cobalt Radioisotopes; D004531:Eggs / Q000032:analysis; D005260:Female; D005396:Fish Products / Q000032:analysis; D005504:Food Analysis; D006801:Humans; D006879:Hydroxocobalamin / Q000032:analysis; D007408:Intestinal Absorption; D008297:Male; D008460:Meat / Q000032:analysis; D008875:Middle Aged; D008892:Milk / Q000032:analysis; D013329:Structure-Activity Relationship; D014805:Vitamin B 12 / Q000032:analysis* / Q000378:metabolism; D014915:Whole-Body Counting
chemical_list: D003037:Cobalt Radioisotopes; D014805:Vitamin B 12; D006879:Hydroxocobalamin