DTNB(Ellman 试剂)(5,5-二硫代-双-(2-硝基苯甲酸))
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DTNB(Ellman 试剂)(5,5-二硫代-双-(2-硝基苯甲酸))
Thermo Scientific™

DTNB(Ellman 试剂)(5,5-二硫代-双-(2-硝基苯甲酸))

Thermo Scientific Pierce Ellman 试剂 (DTNB) 与巯基基团反应生成有色产物,提供了一种可靠的方法来测量溶液中的还原半胱氨酸和其他游离巯基。Ellman 试剂(5,5'-二硫代-双-[2-硝基苯甲酸]了解更多信息
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货号数量
225825 g
货号 22582
价格(CNY)
1,789.00
飞享价
Ends: 31-Dec-2025
2,284.00
共减 495.00 (22%)
Each
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数量:
5 g
请求批量或定制报价
价格(CNY)
1,789.00
飞享价
Ends: 31-Dec-2025
2,284.00
共减 495.00 (22%)
Each
添加至购物车
Thermo Scientific Pierce Ellman 试剂 (DTNB) 与巯基基团反应生成有色产物,提供了一种可靠的方法来测量溶液中的还原半胱氨酸和其他游离巯基。

Ellman 试剂(5,5'-二硫代-双-[2-硝基苯甲酸])用于通过与含巯基基团化合物(如半胱氨酸)的标准曲线进行比较,估计样品中的巯基。或者,巯基基团可使用 TNB 的消光系数(412nm 处 14,150M-1 cm-1)进行测定。Ellman 试剂已用于巯基估算以外的应用,例如采用柱前衍生化程序的 HPLC 烷基硫醇测定和若干酶活性位点硫醇的研究。

Ellman 试剂的特点:

巯基测定—与游离(还原)巯基基团 (—SH) 定量反应,以生成可检测的 TNB 产物
比色检测—有色产品支持在比色皿或微孔板中进行分光光度测量 (λmax = 412nm; ε = 14,150/M·cm)
成熟的分析方法—已明确表征的化学试剂可利用消光系数计算或通过与半胱氨酸标准进行比较,对肽或蛋白巯基基团进行定量测定

试剂特性
• 别名:DTNB、Ellman 试剂
• 化学名称:5,5'-二硫代-双-(2-硝基苯甲酸)
• 可与以下基团发生反应:巯基基团 (—SH)
• 化学式:C14H8N2O8S2
• CAS 号:69-78-3
• 分子量:396.35
• 形态:黄色结晶粉末

DTCNB 与游离巯基基团反应生成混合二硫化物和 2-硝基-5-硫苯甲酸 (TNB)。在该反应中,DTNB 的靶标是一个游离巯基基团的偶联基 (R—S-)。因此,此反应的速率取决于多种因素:(1) 反应 pH 值、(2) 巯基的 pKa'和 (3) 空间和静电效应。TNB 是此反应生成的有色物质,可见光范围内具有高摩尔消光系数。Ellman (1959) 最初报告 TNB 的摩尔消光系数为 13,600M-1 cm-1(412 nm,pH 值 8.0)。因此,文献中经常引用这一数值。然而,后来的研究显示,在 412 nm 处 14,150M-1 cm-1 的值可以更准确地反映摩尔消光系数。TNB 的消光值不受 pH 值在 7.6 至 8.6 之间的变化的影响。然而,TNB 的消光值在其他溶剂中有所不同。
仅供科研使用。不可用于诊断程序。
规格
数量5 g
产品类型DTNB
Unit SizeEach

常见问题解答 (FAQ)

Are there other uses for Thermo Scientific Ellman's Reagent besides estimation of sulfhydryls?

Ellman's Reagent may be used for applications other than the estimation of sulfhydryls in solution. It has been used for the determination of alkylthiols by HPLC using a pre-column derivatization procedure and to study thiols in the active site of several enzymes including thiolase, fatty acid synthase and mevalonate 5-diphosphate decarboxylase.

Find additional tips, troubleshooting help, and resources within our Protein Assays and Analysis Support Center.

What should I do if the sulfhydryl content in my sample is lower than expected?

It is possible that the sulfhydryls in the sample are not in reduced (free) state; i.e., have become oxidized. Ensure reduction of sulfhydryls using a reducing agent, then minimize the time delay between assay of the sample and its use in applications that depend on its free sulfhydryl content. Also maintain 1-5 mM EDTA in the sample to chelate divalent metal ions, which can oxidize sulfhydryls.

Find additional tips, troubleshooting help, and resources within our Protein Assays and Analysis Support Center.

What are the Quality Specifications for each lot of Thermo Scientific Ellman's Reagent?

The Certificate of Analysis lists if the infrared spectrum conforms to the structure and if the purity ≥ 98%.

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How stable are working solutions of Thermo Scientific Ellman's Reagent?

The Ellman's Reagent Solution can be prepared in advance in the recommended reaction buffer (0.1 M sodium phosphate, pH 8.0, containing 1 mM EDTA), and will be stable for about 1 week . An Ellman's Reagent Solution prepared in Tris pH 8.0 will also be stable for 1 week. The Ellman's Reagent Solution preapred in PBS, pH 7.2 is only stable for 1-2 days. This chemical is incompatible with strong oxidizing agents, strong bases and is sensitive to the presence of thiols. We have not tested Ellman's Reagent with DMSO.

Find additional tips, troubleshooting help, and resources within our Protein Assays and Analysis Support Center.

What is the recommended storage condition for Thermo Scientific Ellman's Reagent?

We recommend storing the product protected from moisture at 4 degrees C. It is susceptible to some hydrolysis by moisture. The product is shipped at ambient temperature.

Find additional tips, troubleshooting help, and resources within our Protein Assays and Analysis Support Center.