怎样判定缺少哪些维生素 缺维生素A:指甲出现深刻明显的白线,头发桔千,皮肤粗糙,记忆力减 退心情烦躁及失眠 缺维生素B:对音响有过敏性反成,小腿有间歌性的酸痛 缺维生素B2:嘴角破裂溃烂,出现各种皮肤性疾病,手脚有灼热感觉。对 光有过度敏感的反应 缺维生素B3:舌头红肿,口臭,口腔溃疡,情绪低落 缺维生素B6:舌苔厚重,嘴唇浮肿,头皮特多,口腔粘膜干燥。 缺少维生素B12:行动易失平衡,身体时有间歇性不定位置痛楚,手指及 脚趾酸痛。 缺少维生素C:伤口不易愈合,虚弱,牙齿出血,舌苔厚重
怎样判定缺少哪些维生素 缺维生素A：指甲出现深刻明显的白线，头发枯干，皮肤粗糙，记忆力减 退心情烦 躁及失眠。 缺维生素B1：对音响有过敏性反应，小腿有间歇性的酸痛。 缺维生素B2：嘴角破裂溃烂，出现各种皮肤性疾病，手脚有灼热感觉。对 光有过度敏感的反应。 缺维生素B3:舌头红肿，口臭，口腔溃疡，情绪低落。 缺维生素B6：舌苔厚重，嘴唇浮肿，头皮特多，口腔粘膜干燥。 缺少维生素B12：行动易失平衡，身体时有间歇性不定位置痛楚，手指及 脚趾酸痛。 缺少维生素C：伤口不易愈合，虚弱，牙齿出血，舌苔厚重
Vitamin A(维生素入emno R R= CH2OH Retinol (VAi) R-CHO Retinal s R-COOH Retinic acid Retinol was isolated in1 931 by Karrer and co-worker from fish liver oil, the richest common natural source, after saponification to release the VA from the ester-bond forms the liver of freshwater fishes has yielded a second vitamin A, 3-dehydroretinol, or Vitamin A2 VitaminA This compound is one-half as potent as va in the rat assay
Vitamin A(维生素 A, Retinol) 1 R 2 4 5 6 7 8 10 12 14 R= CH2OH Retinol (VA1) R= CHO Retinal R=COOH Retinic acid Retinol was isolated in1931 by Karrer and co-worker from fish liver oil,the richest common natural source, after saponification to release the VA from the ester-bond forms.the liver of freshwater fishes has yielded a second vitamin A,3-dehydroretinol, or Vitamin A2 1 R 2 4 5 6 7 8 10 12 14 Vitamin A2 This compound is one-half as potent as VA in the rat assay
The structure of retinol, C20H30O, was established by hydrogenation and oxidation studies and has all trans structure The SAR of vA 增加双键数 目活性降低 部或部分氢化活性丧失
The structure of retinol, C20H30O, was established by hydrogenation and oxidation studies and has all trans structure. The SAR of VA OH 1 2 6 7 8 10 12 14 酯化或换成醛,活性不变 但换成羧基时其活性仅为 VA的十分之一 双键全部或部分氢化,活性丧失 四个双键必须与环内双键共轭,否则活 性消失增加或缩短炭链,活性大为降低 增加双键数 目活性降低
The deficiency disease in humans involves an ocular disorder characterized by night blindness and conjunctivitis(结膜炎)a drying of skin with accompanying hyperkeratosis(角化病)of the follicles(tte), and a general decline in health and growth Since 1951, The vitamin A has been commercially supplied almost exclusively as retinol acetate or palmitate. Before that time, highly purified fish liver oil fractions be met this supply Excellent dietary sources of VA are liver, kidney, fish liver oil, and fruits and vegetables high in carotene content, sush as carrots pinch, peaches, and apricots Many synthetic pathways were developed, and at least six manufacturing processes are in operation today, all begin with Beta-Ionone, a bulk chemical of the perfume industry, which can be made synthetically from-acetone
The deficiency disease in humans involves an ocular disorder characterized by night blindness and conjunctivitis(结膜炎), a drying of skin with accompanying hyperkeratosis(角化病) of the follicles(毛囊), and a general decline in health and growth. Since 1951, The vitamin A has been commercially supplied almost exclusively as retinol acetate or palmitate. Before that time, highly purified fish liver oil fractions be met this supply. Excellent dietary sources of VA are liver,kidney,fish liver oil,and fruits and vegetables high in carotene content, sush as carrots, spinach, peaches, and apricots Many synthetic pathways were developed, and at least six manufacturing processes are in operation today, all begin with Beta-Ionone, a bulk chemical of the perfume industry,which can be made synthetically from acetone
计ari Sources of vitamin a and beta-carotene: Vitamin A comes from animal sources such as eggs, meat and lairy products Beta-carotene, a precursor of vitamin a, comes from green, leafy vegetables and intensely colored fruits and vegetables MADAM