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- 供应商:
嵘崴达
- 保质期:
见说明书
- 保存条件:
见说明书
- 英文名:
Uricase from Arthrobact.protophormiae
- 库存:
需确认
from Arthrobacter protophormiae, lyophilizate
Oxidase that catalyzes the oxidation of uric acid to 5-hydroxyisourate which
decomposes to allantoin under in vitro conditions.
Application
Use Uricase in diagnostic tests for the determination of uric acid and for the
elimination of uric acid interferences.
Benefits
Eliminate uric acid interferences. ■
Rely on the proven diagnostic quality. ■
EC 1.7.3.3
Properties
Nomenclature: Urate:oxygen oxidoreductase
Molecular weight: ~170 kD, with four subunits of ~40 kD
Michaelis constant (Phosphate buffer, 0.1 mol/l, pH 8.0; +25°C):
Urate: 6.6 x 10 -5 mol/l
Stabilizer/activators: EDTA is good for stabilization. DTT or DTE may show
a stabilizing effect depending on reagent composition. Triton X-100 (1-2 ml/l)
may show an activating effect.
Inhibitors: Zn 2+ , Cl - (Tris-HCI buffer is not suitable) and borate inhibit strongly.
NaN 3 , 0.1% does not inhibit.
pH optimum: 9.0 (see figure). Roche uric acid reagent contains phosphate
buffer, pH 7.8. For these conditions, high activity and higher stability of the
Uricase are achieved.
Temperature dependence: See figure, above +50°C there is a decrease in
activity due to lower O 2 concentration.
pH stability: 6.5-10.0 (see figure)
Thermal stability: +20°C to +60°C (see figure)
Specificity: Uricase is specific for urea.
Specification
Appearance: White lyophilizate
pH value (c=10 mg/ml in water): 6.7-7.5
Protein (Biuret): No limit
Activity (+25°C, urate, saturated with O 2 , pH 8.5): ≥20 U/mg lyophilizate
Specific activity: ≥50 U/mg protein
Contaminant (expressed as percentage of Uricase activity):
Catalase: ≤0.5
Stability: At +2 to +8°C within specification range for 12 months. Store dry.
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文献和实验% 的尿酸从含嘌呤或核蛋白丰富的食物中分解得到。由于在人类中尿酸酶基因沉默不表达,因此患高尿酸血症的风险也大大增加。而在多数哺乳类动物中尿酸氧化酶基因正常表达,尿酸直接分解成尿囊素,随尿液排出体外。因此在动物模型中复制人类高尿酸血症具有一定困难。 高尿酸模型造模机制 常用的高尿酸血症动物模型主要分为两类:药物诱导模型和基因敲除模型。前者是根据尿酸的代谢途径使用药物,通过增加尿酸来源或减少尿酸排泄来实现,又分为三类:增加尿酸的摄入、抑制尿酸的排泄、抑制尿酸酶活性;后者主要涉及到尿酸酶 Uox 和转运
3-羟基邻氨基苯甲酸 3-hydroxyanthranilic acid
色氨酸代谢的中间体,在犬尿酸酶的作用下,可从3-羟基犬尿酸生成。另外利用链孢霉的变种实验证明,它还能转变成吡啶 2, 3-二羟酸和尼克酸。在动物中几乎存在同样的代谢途径。另外, 3-羟基犬尿酸是果蝇眼睛色素、眼黄质( xanthommatin)的前体物质。
C6 H5 CONHCH2 COOH,相当于苯甲酰甘氨酸,马及其它草食动物的尿中含量很多,在人的尿中也含有少量。从食物摄入的苯甲酸输送到肝脏,在 ATP, Mg2 CoA的共同作用下,肽键和甘氨酸结合生成的化合物。这种合成在狗是于肾脏中进行的,其它动物是在肝脏中进行的,从肝脏中提取出来的酶样品在试管中也能进行。分解马尿酸的酶为马尿酸酶( hippuricase)。
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