氨基酸类药。氨基酸输液及氨基酸复合制剂的原料,作营养增补剂。治疗脊髓灰质炎和性核性脑炎、甲状腺机能亢进等症。亦用于制造二碘酪氨酸、二溴酪氨酸及L-多巴的原料。
人一天经口20g未见副作用。避光,密封保存。
中文名 | L-酪氨酸 |
英文名 | L-Tyrosine |
别名 | 酪氨酸 L-酪氨酸 L-β-对羟苯基-β-丙氨酸 (2S,3R)-2-氨基-3-对羟苯基丙酸 |
英文别名 | Tyr H-Tyr-OH NSC 9973 Tyrosine NSC 82624 L-Tyrosine p-Tyrosine tyrosine usp L-p-Tyrosine (S)-Tyrosine L-(-)-Tyrosine Tyrosine,L- (8CI) L-Tyrosine, Free Base L-Phenylalanine, 4-hydroxy- 3-(4-Hydroxyphenyl)-L-alanine L-tyrosine plant cell culture tested (-)-a-Amino-p-hydroxyhydrocinnamicacid L-tyrosine free base cell culture*tested (S)-a-Amino-4-hydroxybenzenepropanoicacid (S)-2-Amino-3-(4-hydroxyphenyl)propanoic acid (2S)-2-Amino-3-(4-hydroxyphenyl)propanoic acid Benzenepropanoic acid, a-amino-4-hydroxy-, (S)- Propanoic acid,2-amino-3-(4-hydroxyphenyl)-, (S)- |
CAS | 60-18-4 55520-40-6 |
EINECS | 200-460-4 |
化学式 | C9H11NO3 |
分子量 | 181.19 |
InChI | InChI=1/C9H11NO3/c10-8(9(12)13)5-6-1-3-7(11)4-2-6/h1-4,8,11H,5,10H2,(H,12,13)/t8-/m0/s1 |
InChIKey | OUYCCCASQSFEME-QMMMGPOBSA-N |
密度 | 1.34 |
熔点 | 290℃ |
沸点 | 314.29°C (rough estimate) |
比旋光度 | -11.65 ° (C=5,DIL HCL/H2O 50/50) |
闪点 | 176℃ |
水溶性 | 0.45 g/L (25℃) |
溶解度 | 难溶于水(0.04%, 25°C), 不溶于无水乙醇、乙醚和丙酮, 可溶于稀酸或稀碱。 |
折射率 | -12 ° (C=5, 1mol/L H |
酸度系数 | 2.2(at 25℃) |
PH值 | 6.5 (0.1g/l, H2O) |
存储条件 | Store below +30°C. |
稳定性 | 稳定。与强氧化剂、强还原剂不相容。 |
敏感性 | Sensitive to light |
外观 | 粉末 |
颜色 | White to Pale-brown |
Merck | 14,9839 |
BRN | 392441 |
物化性质 | 产品呈丝光细针状结晶或结晶性粉末。熔点≥300℃。342~344℃分解。在与烃类共存下则更易分解。密度1.456g/cm3。pK′12.20;pK′29.11;pK′310.07。旋光度-10.6º(c=4,在1mol/LHCl中);-13.2º(c=4,3mol/LNaOH中)。-12.3º±0.5º,-11.0º±0.5º(c=4,lmol/L HCl中)在水中溶解度(g/100ml):0.02(0℃);0.045(25℃);0.105(50℃);0.244(75℃);0.565(100℃)。易溶于碱水溶液。不溶于中性有机溶剂,如无水乙醇、乙醚、丙酮等。 |
MDL号 | MFCD00002606 |
危险品标志 | Xi - 刺激性物品 |
风险术语 | R36/37/38 - 刺激眼睛、呼吸系统和皮肤。 |
安全术语 | S26 - 不慎与眼睛接触后,请立即用大量清水冲洗并征求医生意见。 S36 - 穿戴适当的防护服。 |
WGK Germany | 3 |
RTECS | YP2275600 |
TSCA | Yes |
海关编号 | 29225000 |
上游原料 | 蛋白质 乙二胺四乙酸 酪蛋白 工业盐酸 水解物 Boc-D-酪氨酸 |
下游产品 | [MET5]脑啡肽 DL-酪氨酸 3-碘-L-酪氨酸 O-苄基-L-酪氨酸 |
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酪氨酸 (Tyrosine, 缩写为 Tyr or Y)或 4 - 羟基苯丙氨酸, 是细胞用来合成蛋白质的22种氨基酸之一,在细胞中可用于合成蛋白质,其密码子为UAC和UAU,属于含有极性侧基,人体可自行合成的非必需氨基酸。单词“酪氨酸”是来自希腊语 tyros,意思奶酪。19世纪初被德国的化学家尤斯图斯·冯·李比希首先在起司的酪蛋白中发现,当用作于官能基或侧基时则称做酪氨酰。
除了是一个蛋白质氨基酸,在蛋白质中的讯号传导过程中,酪氨酸凭借著酚官能基具有特殊作用,其功能为被蛋白激酶(所谓的酪氨酸激酶受体)信号转移的磷酸基的受器,而羟基的磷酸化改变的目标蛋白质的活性。
酪氨酸在光合作用中也扮演重要角色,在叶绿体(光系统II)中,在氧化叶绿素的还原反应中被当作电子提供者,使其进行酚醛OH-基团的去质子化,最后在光系统II中被四个核心锰簇还原。
酪氨酸可在体内由苯丙氨酸合成,可在许多高蛋白质食品如如鸡,火鸡,鱼,牛奶,酸奶,奶酪,干酪,花生,杏仁,南瓜子,芝麻,大豆,利马豆,鳄梨和香蕉中被发现。
在微生物或植物中,酪氨酸透过预苯酸(一种莽草酸反应途径产生的中间产物)产生,预苯酸被保留的羟基氧化脱羧得到对-羟基苯基丙酮酸,酪氨酸和α-酮戊二酸利用谷氨酸作为氮源进行氨基转移反应产生对-羟基苯基丙酮酸。
哺乳动物利用来自食物的必需氨基酸苯丙氨酸(PHE)来合成酪氨酸,苯丙胺酸转换成酪氨酸的反应由丙氨酸羟化酶(一种单氧化酶)催化而成,这种酶催化反应造成羟基和苯丙氨酸的6-碳环的芳香环端部的加成反应,使之变成酪氨酸。
某些酪氨酸可以用蛋白激酶的磷酸基标注,酪氨酸在磷酸化形式时被称作磷酸酪氨酸,酪氨酸磷酸化被认为是信号转导和酶活性调控中的关键步骤之一,磷酸酪氨酸可以被特定抗体所侦测,酪氨酸也可以被添加的硫酸基修饰,这个反应过程称为酪氨酸硫酸盐化。酪氨酸硫酸盐化是由酪氨酰蛋白质中的磺基转移酶(TPST)所催化而成,如同上面所提到的磷酸酪氨酸抗体,此抗体具有特异性可侦测到磺基酪氨酸。
在大脑中的多巴胺细胞中,酪氨酸被酶酪氨酸羟化酶(TH)转化成左旋多巴胺,酶酪氨酸羟化酶是一种具有速率限制酶,被使用于神经传递物质多巴胺的合成过程中,多巴胺可以被转化成儿茶酚胺去甲肾上腺素(去甲肾上腺素)和肾上腺素(肾上腺素)。
甲状腺激素三碘甲状腺氨酸 (T3)和在甲状腺胶体中的甲状腺素 (T4)也来自于酪氨酸。
就化学而言,肾上腺素是所谓儿茶酚胺的一组单胺之一。它从氨基酸苯丙氨酸和酪氨酸于中枢神经系统的一些神经元,及在肾上腺髓质的嗜铬细胞产生。
罂粟科催眠物质中的胶乳又称为罂粟,已被证实能将酪氨酸转换成生物碱吗啡,在其生物合成反应途径中,酪氨酸利用碳-14放射性标记的酪氨酸追踪体内合成路径。
三甲氧苯乙胺生产仙人掌生物合成酪氨酸。
酪氨酸解氨酶(TAL)是一种在天然酚生物合成反应途径中的酶,此酶将左旋酪氨酸转换成对香豆酸。
酪氨酸也是色素中的黑色素的前驱物。
酪氨酸分解成乙酰乙酸和富马酸。在分解过程中两个双加氧酶是必要物质,最终产物都会进入柠檬酸循环。
左旋酪氨酸(对-羟基苯丙氨酸)的分解作用,为酪氨酸转氨酶变成对-羟基苯基丙酮酸的α-酮戊二酸的依赖性转移反应而成,其结合位置为对位,缩写为p,表示苯环上的羟基和侧链是对面方位(见下图)。
下一步的氧化步骤中,由对-羟基苯基丙酮酸-双加氧酶和二氧化碳尿黑酸(2,5-二羟基苯基-1-乙酸乙酯)裂断催化而成,为了拆开尿黑酸的芳香环,通过氧分子进一步的结合以得到尿黑酸加氧酶是必须。
富马酰乙酸经由氧化的羟基所造成的羧基旋转,而产生maleylacetoacetate -顺式-反式异构酶。含有谷胱甘肽的顺-反异构酶作为辅酶,经由添加水分子,延胡索酰乙酰乙酸最终被延胡索酰乙酰乙酸水解酶给裂断。
富马酸盐(也是柠檬酸循环的代谢产物)和乙酰乙酸酯(3-丁酮酸)为游离状态,乙酰乙酸酯是一种酮,其被琥珀酰-CoA活化后可以被转化成乙酰-CoA,反过来又可被柠檬酸循环氧化或用于脂肪酸合成。
Phloretic酸也是大鼠中泌尿代谢物的酪氨酸。
氨基酸类药。氨基酸输液及氨基酸复合制剂的原料,作营养增补剂。治疗脊髓灰质炎和性核性脑炎、甲状腺机能亢进等症。亦用于制造二碘酪氨酸、二溴酪氨酸及L-多巴的原料。
一. 碱溶段
原料:三次母液(L-胱氨酸生产中三次中和段产物)
辅料:液碱,纯水,活性炭
将三次母液通入碱溶罐内,通(投)入液碱,纯水,活性炭,温度90,碱溶时间6h,过滤。
终点产物:1,滤渣(回收利用) 2,滤液(去一次中和段)
二,一次中和段
辅料:盐酸
滤液进入一次中和罐,通入盐酸,温度80,中和时间6h,终点PH=8.5,过滤。
终点产物:1,滤液(回收利用)2,滤渣(去脱色段)
三,脱色段
辅料:盐酸,蒸汽,纯水,活性炭
滤渣进入脱色罐,通(投)入盐酸,蒸汽,纯水,活性炭,温度80,脱色时间2h,终点ph=0.5,过滤。
终点产物:1,滤渣(回收利用) 2,滤液(去二次中和段)
四,二次中和段
辅料:氨水
滤液进入二次中和罐,通入氨水,温度80,中和时间4h,终点ph=4.0,结晶,过滤
终点产物:1,滤液(回收利用)2,滤渣(即L-酪氨酸粗品,去精制段)
五,精制段
辅料:蒸馏水,蒸汽
用蒸馏水冲洗上段工序产品并离心甩干,送入烘干机,通入蒸汽烘干,包装,入库,烘干温度100,气压-0.09Mpa,烘干时间5h。
终点产物:L-酪氨酸成品
人一天经口20g未见副作用。避光,密封保存。
皮肤白不白,主要取决于黑色素细胞合成黑色素的能力。在人的表皮基层细胞间,分布着黑色素细胞,它含有的酪氨酶可以将酪氨酸氧化成多糖,中间再经过一系列的代谢过程,最后便可生成黑色素。黑色素生成得多,皮肤就越黑;反之,则皮肤就越白皙。
研究证明,酪氨酸酶的活性与体内的铜、铁、锌等元素密切相关。经常进食富含酪氨酸和稀有元素锌、铜、铁的物质,例如动物内脏、肾,甲壳类动物蛤、蟹、河螺、牡蛎,水产品乌鱼子,豆类的大豆、扁豆、青豆、赤豆,硬壳果类花生、核桃、黑芝麻以及葡萄干等,皮肤的色泽就较黑。因此住在海边的人,打渔的渔民,由于吃以上水产品较多,因此皮肤色泽较黑。
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