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ONPG  (Synonyms: 2-Nitrophenyl β-D-galactopyranoside)

目录号: HY-15926 纯度: 99.84%
COA 产品使用指南

ONPG 是一种比色和分光光度计底物,用于检测 β-半乳糖苷酶活性。

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ONPG Chemical Structure

ONPG Chemical Structure

CAS No. : 369-07-3

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规格 价格 是否有货 数量
10 mM * 1 mL in Water ¥220
In-stock
500 mg ¥200
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1 g ¥300
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5 g ¥950
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10 g   询价  
50 g   询价  

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Other Forms of ONPG:

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Top Publications Citing Use of Products
  • 生物活性

  • 实验参考方法

  • 纯度 & 产品资料

  • 参考文献

生物活性

ONPG is a colorimetric and spectrophotometric substrate for detection of β-galactosidase activity.

体外研究
(In Vitro)

该酶对 ONPG 具有高水解能力 (100%),对其天然底物乳糖 (25.7%) 具有中等活性。然而,该酶对所有其他显色硝基苯基类似物的水解能力非常弱,表明 Gal308 是一种具有窄底物特异性的 β-半乳糖苷酶。
研究 Gal308 用于 ONPG 和乳糖的重组酶的动力学参数、Michaelis-Menten 常数 (Km)、转换数 (kcat) 和催化效率 (kcat/Km)。对 ONPG 的 kcat 和 Km 值分别为 464.7±7.8 s-1 和 2.7±0.3 mM,对乳糖的 kcat 和 Km 值分别为 264.2±2.1 s-1 和 7.1±0.8 mM。
ONPG 酶的 kcat/Km 值 (172.1 s-1mM-1) 为 乳糖的 4.6 倍 (37.2 s-1mM-1),清楚地表明 Gal308 对 ONPG 的催化效率远高于乳糖[1]

MCE has not independently confirmed the accuracy of these methods. They are for reference only.

分子量

301.25

Formula

C12H15NO8

CAS 号
性状

固体

颜色

White to off-white

运输条件

Room temperature in continental US; may vary elsewhere.

储存方式
Powder -20°C 3 years
4°C 2 years
In solvent -80°C 2 years
-20°C 1 year
溶解性数据
In Vitro: 

H2O 中的溶解度 : 8.33 mg/mL (27.65 mM; 超声助溶 (<60°C))

配制储备液
浓度 溶剂体积 质量 1 mg 5 mg 10 mg
1 mM 3.3195 mL 16.5975 mL 33.1950 mL
5 mM 0.6639 mL 3.3195 mL 6.6390 mL
查看完整储备液配制表

* 请根据产品在不同溶剂中的溶解度选择合适的溶剂配制储备液;一旦配成溶液,请分装保存,避免反复冻融造成的产品失效
储备液的保存方式和期限:-80°C, 2 years; -20°C, 1 year。-80°C储存时,请在2年内使用, -20°C储存时,请在1年内使用。

* 备注:如您选择水作为储备液,请稀释至工作液后,再用 0.22 μm 的滤膜过滤除菌后使用。

  • 摩尔计算器

  • 稀释计算器

Mass (g) = Concentration (mol/L) × Volume (L) × Molecular Weight (g/mol)

质量
=
浓度
×
体积
×
分子量 *

Concentration (start) × Volume (start) = Concentration (final) × Volume (final)

This equation is commonly abbreviated as: C1V1 = C2V2

浓度 (start)

C1

×
体积 (start)

V1

=
浓度 (final)

C2

×
体积 (final)

V2

动物溶解方案计算器
请输入动物实验的基本信息:

给药剂量

mg/kg

动物的平均体重

g

每只动物的给药体积

μL

动物数量

由于实验过程有损耗,建议您多配一只动物的量
计算结果
工作液所需浓度 : mg/mL
您所需的储备液浓度超过该产品的实测溶解度,如有需要,请与 MCE 中国技术支持联系。
纯度 & 产品资料

纯度: 99.84%

参考文献
Kinase Assay
[1]

The β-galactosidase activity is measured using two substrates including ONPG and lactose in this study. The β-galactosidase activity for ONPG is measured by following the amount o-nitrophenol released from ONPG. The reaction mixture is composed of 100 μL of the enzyme solution and 400 μL of ONPG solution (2.5 g/L in 100 mM Tris-HCl buffer at pH 6.8). After incubation at 78°C for 15 min, the reaction is terminated by adding an equal volume of 1 M Na2CO3. The released o-nitrophenol is quantitatively determined by measuring at A405. One unit of activity is defined as the amount of enzyme needed to produce 1 μmol of o-nitrophenol per minute under the assay condition. The specific activity is expressed as units per milligram of protein. Assays for activity towards lactose are performed in the same buffer containing 100 μL of enzyme solution and 5% lactose, and the reaction is stopped by boiling for 10 min, and the concentration of glucose is determined using a glucose oxidase-peroxidase assay kit. The released glucose is quantitatively determined by measuring A492. One unit of enzyme activity is defined as the amount of activity required to release 1 μmol of glucose per minute[1].

MCE has not independently confirmed the accuracy of these methods. They are for reference only.

参考文献

完整储备液配制表

* 请根据产品在不同溶剂中的溶解度选择合适的溶剂配制储备液;一旦配成溶液,请分装保存,避免反复冻融造成的产品失效
储备液的保存方式和期限:-80°C, 2 years; -20°C, 1 year。-80°C储存时,请在2年内使用, -20°C储存时,请在1年内使用。

可选溶剂 浓度 溶剂体积 质量 1 mg 5 mg 10 mg 25 mg
H2O 1 mM 3.3195 mL 16.5975 mL 33.1950 mL 82.9876 mL
5 mM 0.6639 mL 3.3195 mL 6.6390 mL 16.5975 mL
10 mM 0.3320 mL 1.6598 mL 3.3195 mL 8.2988 mL
15 mM 0.2213 mL 1.1065 mL 2.2130 mL 5.5325 mL
20 mM 0.1660 mL 0.8299 mL 1.6598 mL 4.1494 mL
25 mM 0.1328 mL 0.6639 mL 1.3278 mL 3.3195 mL

* 备注:如您选择水作为储备液,请稀释至工作液后,再用 0.22 μm 的滤膜过滤除菌后使用。

Help & FAQs
  • Do most proteins show cross-species activity?

    Species cross-reactivity must be investigated individually for each product. Many human cytokines will produce a nice response in mouse cell lines, and many mouse proteins will show activity on human cells. Other proteins may have a lower specific activity when used in the opposite species.

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产品名称:
ONPG
目录号:
HY-15926
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