| 摘要 |
1,165,809. Nicotinamide adenine dinucleostide. KYOWA HAKKO KOGYO CO. Ltd. 20 July, 1967 [29 July, 1966], No. 33483/67. Heading C2C. Nicotinamide adenine dinucleostide (NAD) is obtained by culturing a microorganism capable of producing NAD in an aqueous nutrient medium under aerobic conditions in the presence of at least one material selected from pantothenic acid, #-alanine and coenzyme A or their functional derivatives, or mixtures thereof. Suitable microorganisms are yeasts, bacteria, ray fungi and moulds and especially bacteria belonging to the genera Brevibacterium, Corynebacterium and Arthrobacter. The fermentation medium may comprise a synthetic culture medium or a natural nutrient medium and generally contains a carbon source, e.g. a carbohydrate glycerol, mannitol, sorbitol, organic acid or hydrocarbon, a nitrogen source and inorganic compounds and the presence of essential nutrients such as amino acids and/or vitamins may also be necessary. The pantothenic acid, #alanine or coenzyme A may be added as such or in the form of their salts or in the form of natural substances containing them. Suitable incubation temperatures are from 20‹ to 40‹ C. and a pH of about 5 to 9 is preferred. The NAD may be separated from the culture liquor by e.g. ion exchange resin treatment, precipitation with metallic salts, extraction or adsorption methods, or chromatography. In examples the species of micro-organisms used are Brevibacterium ammoniagenes, Corynebacterium sp. and Arthrobacter sp.
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