脲酶 来源于刀豆

CAS: 9002-13-5 货号: U128713 EC号: 232-656-0
有货
级别和纯度: EnzymoPure™ ? EnzymoPure™ —— 阿拉丁的高质量酶解决方案系列。当酶纯度和明确活性决定检测或工艺性能时使用。 ≥45 units/mg dry weight
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50mg
U128713-50mg
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为什么选择此级别

EnzymoPure™ 级 ,适用于对基线干扰要求严格的色谱和分析工作流程。

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储存与运输

-20°C储存。超低温运输 。请查阅批次 COA 获取详细规格。

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文献证明

在色谱分析、有机合成和交叉偶联反应领域已被 45 篇同行评审文献引用。

概述


Jespersen (1975) reports that ammonium carbamate is produced in citrate and Tris buffer.
Urease occurs in many bacteria, several species of yeast and a number of higher plants. Varner (1960) has reviewed it. Two of the best sources are: Jack beans (Canavlia ensiformis) from which it has been crystallized and thoroughly studied, and Bacillus pasteurii.
The enzyme is important in assaying for urea. See Guilbault and Montalvo (1970). Its immobilization has been reported: et al. (1974), James and Pring (1975), Messing (1974), Nakamoto et al. (1975), Sundaram (1973) and Tran-Minh and Broun (1975).
Characteristics of Urease from Jack Bean:
Km: 1.3mM in Tris⋅HCl (Cesareo and Langton, 1992).
Specificity
Urease is specific for urea and hydroxyurea (Fishbein and Carbone 1965). See also Sundaram and Laidler (1970).
Composition
Monomeric (a)urease can polymerize to form six unit polymers of about three million daltons. (Fishbein et al. 1970; Fishbein and Nagarajan 1972a). Andrews and Reithel (1970) report on the sulfhydryl groups. Contaxis and Reithel (1971) indicate the molecule can be split in half with no loss of activity. See also Contaxis and Reithel (1972), Fishbein and Nagarajan (1972b), Lynn (1970), and Bailey and Boulter (1969).
Optimal pH:7.4 
Stabilizers
EDTA in concentrations of 1 X 10-3 M. 50% glycerol solutions protect urease crystalline suspension for several months at 4°C.
Inhibitors
Heavy metals. NH4+ ions formed. See also Fishbein and Carbone (1965). Sodium and potassium ions are inhibitors (Cesareo and Langton, 1992).
Urease Assay
Method
Worthington has adopted an assay method where the hydrolysis of urea is measured by coupling ammonia production to a glutamate dehydrogenase reaction.
formulas
One unit results in the oxidation of one micromole of NADH per minute at 25°C and pH 7.6 under the specified conditions. In addition to increased sensitivity, the assay method possesses the advantage that it can be manipulated to permit quantitation of urea.
Reagents
0.1 M Potassium phosphate buffer, pH 7.6
0.023 M Adenosine-5'-diphosphate (ADP) in phosphate buffer
0.0072 M NADH in phosphate buffer
0.026 M a-Ketoglutarate in phosphate buffer
1.8 M Urea in phosphate buffer
Glutamate Dehydrogenase: Dilute to approximately 500 units/ml in 50% glycerol or phosphate buffer. Store cold during use.
Enzyme
Dissolve enzyme at one mg/ml in 0.1 M phosphate buffer, pH 7.6. Immediately prior to use, dilute further in buffer to obtain a rate of 0.02-0.04 ΔA/minute.
Procedure
Adjust spectrophotometer to 340 nm and 25°C. Pipette into each cuvette as follows:

0.10 M Phosphate buffer, pH 7.6 2.4 ml
0.023 M ADP 0.1 ml
0.0072 M NADH 0.1 ml
0.026 M α-Ketoglutarate 0.1 ml
1.8 M Urea 0.1 ml
GLDH (500 units/ml) 0.1 ml

Incubate in spectrophotometer at 25°C for 5-10 minutes to achieve temperature equilibration and establish blank rate, if any. A slight change in absorbance may be observed due to trace ammonia in reagents. Upon obtaining a zero change in absorbance, add 0.1 ml appropriately diluted enzyme. Record decrease in A340 for 8-10 minutes. Determine ΔA340/minute from the linear portion of the curve. A slight lag may occur.

Calculation 


规格

产品名称
脲酶 来源于刀豆
别名
尿素酶
英文别名
Urea amidohydrolase
规格或纯度
EnzymoPure™, ≥45 units/mg dry weight
生化机理
尿素酶催化尿素水解为二氧化碳和氨。尿素酶参与氮代谢和尿素降解。鱼腥草中的尿素酶每个亚基结合 2 个镍离子。
CAS编号和信息
9002-13-5
酶学委员会编号
3.5.1.5
分子类型
酶
储存与运输
物理形态
冻干(Lyophilized)
浓度
≥45 units/mg dry weight
储存条件
-20°C储存
运输条件
超低温运输
单位定义
One Unit oxidizes one micromole of NADH per minute at 25°C, pH 7.6. The hydrolysis of urea is measured by coupling ammonia production to a glutamate dehydrogenase reaction.

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批号(Lot Number) 证书类型 货号
C2511609 分析证书 U128713
C2511610 分析证书 U128713
C2511619 分析证书 U128713
K2526047 分析证书 U128713
B2510038 分析证书 U128713
J2409536 分析证书 U128713
J2409537 分析证书 U128713
J2409538 分析证书 U128713
G2317037 分析证书 U128713
G2317079 分析证书 U128713
G2317096 分析证书 U128713
G2426152 分析证书 U128713
B2318515 分析证书 U128713
H2209752 分析证书 U128713

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