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白桦脂醇473-98-3价格​

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产品中文名称:   白桦脂醇473-98-3价格

中文别名:   桦木醇 

英文名:   Betulin 

英文别名:   Lup-20(29)-ene-3b,28-diol 

CAS登录号:   473-98-3 

分子式:   C30H50O2 

分子量:   442.7 

白桦脂醇473-98-3价格分子结构:  

  

外观:   白色粉末 

规格:   20 mg/支 

纯度:   ≥ 98% 

用途:   用于含量测定/鉴定/药理实验等。 

提取来源:   桦木科植物白桦(Betula platyphylla Suk.)树皮 

溶解性:   溶于乙醇、***、***和苯,微溶于冷水、石油醚等。 

熔点:   256-257℃ 

药理药效:   具有XY、抗病毒、YZ头发纤维中蛋白质溶解、改善受损头发光泽、促进头发生长等活性 

贮存条件:   4℃冷藏、密封、避光 

有效期:   2年

白桦脂醇473-98-3价格标准品和对照品的本质区别:

所谓标准品,即是标准物品,作为一种衡量标准,如果用在药物方面,则为含量测定中的标准含量。标准品包括化学计量标准品、冶金标准品和药检标准品。采用生化方法来测定,目前国家规定的标准品共有15种,林可酶素、新霉素、大观酶素、太乐菌素、链霉素、卡那霉素、绒促性素、盐酶素、杆菌肽锌、安普酶素、红霉素、合成缩宫素、庆大霉素、渡毛化苷G。

所谓对照品,是指用于鉴别、检查、含量测定和校正检定仪器性能的标准物质。采用化学方法来测定,即是一般仪器的都叫做对照品,国家规定的有107种,包括地塞米松、土霉素、阿莫西林等等。

刺五加皂苷B和对照品一样是指国家药品标准中用于鉴别、检查、含量测定、杂质和有关物质检查等标准物质,它是国家药品标准不可分割的组成部分。

但刺五加皂苷B和对照品又是两个不同的概念,ZG药典凡例中有明确的定义:刺五加皂苷B是指用于生物鉴定、抗生素或生物药品中含量或效价测定的标准物质,以效价单位(U)表示,而对照品系指用于鉴别、检查、含量测定和校正检定仪器性能的标准物质。文献中经常混淆了这两个概念,认为刺五加皂苷B就是对照品,是同种物质的不同提法,之所以会有这样的误解,可能是有的药品既有刺五加皂苷B,又有对照品。例如,非那西丁当用作熔点校准物质时,用熔点刺五加皂苷B,测定含量时,用对照品;当用微生物法测定头孢克罗效价时,用头孢克罗刺五加皂苷B,用HPLC或U刺五加皂苷B法测定时,则用对照品。

白桦脂醇473-98-3价格特点:是一种敏感性高,特异性强,重复性好的实验诊断方法,由于其试剂稳定、易保存,操作简便,结果判断较客观等因素,已广泛应用在免疫学检验的各领域中。

检测方式:相色谱法HPLC≥98%。

贮存条件:4℃冷藏、密封、避光。

包装:可根据客户需求提供相应批量包装。

用途:用于含量测定、鉴别、药理实验、活性筛选等。

with HADH2. Soluble APP binds, via its N-terminal head, to FBLN1. Interacts with CPEB1 and AGER. Interacts with ANKS1B and TNFRSF21. Interacts with ITM2B. Interacts with ITM2C. Interacts with IDE. Can form homodimers; this is promoted by heparin binding.

Subcellular Location : Membrane; Single-pass type I membrane protein. Membrane, clathrin-coated pit. Note=Cell surface protein that rapidly becomes internalized via clathrin-coated pits. During maturation, the immature APP (N-glycosylated in the endoplasmic reticulum) moves to the Golgi complex where complete maturation occurs (O-glycosylated and sulfated). After alpha-secretase cleavage, soluble APP is released into the extracellular space and the C-terminal is internalized to endosomes and lysosomes. Some APP accumulates in secretory transport vesicles leaving the late Golgi compartment and returns to the cell surface. Gamma-CTF(59) peptide is located to both the cytoplasm and nuclei of neurons. It can be translocated to the nucleus through association with APBB1 (Fe65). Beta-APP42 associates with FRPL1 at the cell surface and the complex is then rapidly internalized. APP sorts to the basolateral surface in epithelial cells. During neuronal differentiation, the Thr-743 phosphorylated form is located mainly in growth cones, moderately in neurites and sparingly in the cell body. Casein kinase phosphorylation can occur either at the cell surface or within a post-Golgi compartment.

Tissue Specificity : Expressed in all fetal tissues examined with highest levels in brain, kidney, heart and spleen. Weak expression in liver. In adult brain, highest expression found in the frontal lobe of the cortex and in the anterior perisylvian cortex-opercular gyri. Moderate expression in the cerebellar cortex, the 

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