计 amir The benefits of vitamin a: maintains health of specialized ( tissues such as the retina aids in growth and health of skin and mucous membranes promotes normal development of teeth soft and skeletal tissue Adult RDA: 1000 Hg RE Fat-soluble BADAM
HC=CNa/ Lig. Nh Beta Ionone CICH,CO,CH HO COOC,H H2S HO/OH OH EtMgBr CHO BrIg OMg BI
O Beta Ionone O COOC2H5 ClCH2CO2C2H5 NaOCH3 1 2 H2O/OH CHO O HC CNa / Liq. NH3 HO OH H2SO4 EtMgBr BrMg OMgBr
OH H/PO OH POCI OH pyridine Retinol acetate 维生素A(视黄醇) 功能与视觉有关,并能维持粘膜正常功能,调节皮肤状态 缺乏症:夜盲症、眼球干燥,皮肤千燥及痕痒 主要食物来源:红萝卜、绿叶蔬菜、蛋黃及肝
OH OH H2/Pd OH OH OAc OH Ac2O POCl pyridine OAc Retinol acetate 维生素A（视黄醇） 功能：与视觉有关，并能维持粘膜正常功能，调节皮肤状态。 缺乏症：夜盲症、眼球干燥，皮肤干燥及痕痒。 主要食物来源：红萝卜、绿叶蔬菜、蛋黄及肝
Vitamin ds Vitamin D2 Vitamin d (Ergocalciferol) colecalciferol) HO The are more than tone kinds of Vitamin D, the most important of which are VD(麦角骨化醇) and VD2(胆骨化醇)
Vitamin D The are more than tone kinds of Vitamin D, the most important of which are VD2 (麦角骨化醇) and VD3 (胆骨化醇) HO H 1 2 3 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 HO H 5 7 8 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 6 9 Vitamin D2 (Ergocalciferol) Vitamin D3 (Colecalciferol) 1 2 3
a from the photolysis reaction product of ergosterol A Ergocalciferol, VD2, the first product to be isolated pure, wa obtaine HO Ergosterol Vitamin D2 Ergocalciferol
Ergocalciferol, VD2, the first product to be isolated pure, was obtained from the photolysis reaction product of ergosterol. HO H Vitamin D2 (Ergocalciferol) HO uv Ergosterol