精品日韩欧美区一区二区三,亚洲av自偷自拍亚洲一区,亚洲国产三级在线观看,五月综合激情婷婷六月,偷窥少妇久久久久久久久,在线播放免费人成毛片试看,久久99国产亚洲高清观看首页,国产高清AV首播原创麻豆

Niacin is also known as vitamin B3, or vitamin PP, molecular formula: C6H5NO2, heat resistant, can be sublimated. Nicotinic acid and Nick acid, resistance to infection, skin disease factors. In the human body including its derivatives nicotinamide or nicotinamide. It is one of the 13 essential vitamins, is a kind of water-soluble vitamins, belongs to the vitamin B group. Nicotinic acid in converted into niacinamide, nicotinamide coenzyme Ⅰ and part of coenzyme Ⅱ, participates in the metabolism of lipids and tissue respiration of oxidation process and the process of anaerobic decomposition sugar.

　　【English】 Nicotinic acid

　　【Alias】Niacin; Vitamin PP; 3 - Pyridinecarboxylic acid; 3 - Carboxypyridine

　　【Chinese name】 niacin

　　【Nickname 】 Chinese pyridine - 3 - formic acid; Nicole acid; Smoke alkali; Nick acid; Virginia; Nicotine acid; Vitamin PP

　　【 molecular structure】

　　【 molecular formula 】 C₆H₅NO₂

　　【 molecular weight 】 123.11

　　【 CAS login number 59-67-6

　　【 login EINECS number 200-441-0

　　【Density】1.473

　　【melting】234-238 ° C

　　【W(wǎng)ater-soluble 】1 to 5 g / 100 mL at 17 ° C

　　【Safety instructions】S24/25

　　【The physicochemical properties 】

　　Colorless needle crystal. Melting point 236 ℃, 1 gram of the goods in 60 ml water, soluble in boiling water and boiling alcohol, not soluble in propylene glycol, chloroform and alkali solution, insoluble in ether and lipid solvent. Can sublimate, no smell, slightly has a sour taste.

　　Purpose: nicotinic acid to vitamin drugs, and nicotinamide as vitamin PP, used to fight pellagra, can also be used as a medicine blood expansion, a large number of used in food and feed additives. Used as pharmaceutical intermediates, in isoniazid, niacinamide, nicole brake and nicotinic acid ester inositol production.