上海金畔生物科技有限公司代理日本同仁化学 DOJINDO代理商全线产品，欢迎访问官网了解更多信息
C6H11NO
113.16
特点：
● 纯度高
● 杂质峰少
活动进行中
订购满5000元，200元礼品等你拿
凑单关联产品TOP5
NO.1. TEMP 单线态氧检测
NO.2. BMPO 超氧阴离子和羟自由基检测
NO.3. ROS Assay Kit 活性氧检测
NO.4. SOD Assay Kit 超氧化物歧化酶(SOD)检测
NO.5. Caspase-3 Assay Kit-Colorimetric- 细胞凋亡检测
规格性状
质量约为1.1g
产品概述
由于具有潜在的致癌风险和促进衰老的作用，生物体内的自由基已成为研究的热点。 DMPO是研究自由基最常用的自旋捕获剂。 它适用于捕获氧自由基，尤其是超氧化物，并生成具有特征的EPR信号的加合物。 但是，大多数市售的DMPO包含会引起高背景的杂质。 因此，这些DMPO需要进一步纯化才能在EPR上进行实验。 Dojindo的DMPO实行严格的质量管控，没有杂质引起的背景问题，因此不需要任何预纯化处理。
产品特点
•超高纯度
•更高的信噪比
•无需预纯化
同仁化学研究所 (Dojindo) 的DMPO没有杂质 (*) 检出
以羟自由基的Fenton反应(黑色)和空白(蓝色)为例，同仁化学研究所(Dojindo)的峰更清晰，S/N比例更高
应用
自旋捕获剂，EPR（ESR）检测，超氧阴离子，羟基自由基
原理
自旋捕捉ESR技术是一种检测活性氧的最可靠的办法，它能提供具有特征的ESR信号。DMPO采用一种特殊的敏感方法，可以捕捉超氧阴离子和羟自由基等，分别产生独特的ESR光谱。因此它是探测生物系统内ROS的强有力工具。
操作步骤
SOD清除超氧阴离子的活性检测
1. 将15 μl的DMPO溶液和 50 μl的5 mM的次黄嘌呤加入到35 μl的0.1 M的磷酸盐缓冲液 (pH 7.8) 中。
2. 加入50 μl的待测SOD标准品或待测样品，涡旋振荡 1-2 s。
3. 加入50 μl的0.4 U/ml的黄嘌呤氧化酶之后立即涡旋振荡。
4. 放置一段时间 (例如 1 min) 将溶液转入ESR样品管中检测。
5. 通过峰值计算相对强度(DMPO-O2-/Mn2+)。
C-,N-,S-基自由基的检测
1. 制备100 mM含有25 μM Diethylenetriaminepentaacetic Acid (DTPA)的磷酸盐缓冲液 (pH 7.4)，作为过渡金属螯合剂。
2. 制备以下过氧化物酶底物：A) 100 mM 甲酸钠(HCOONa)；B) 100 mM氰化钾(KCN)；C) 100 mM叠氮钠(NaN3)；D) 含有100 mM亚硫酸钠 (Na2SO3)的100 mM磷酸盐缓冲液 (pH 7.4)。
3. 制备4.0 mg/ml(~100 μM)的辣根过氧化物酶 (HRP)溶液和1 mM H2O2溶液。
4. 制备浓度为1 M的DMPO溶液。
5. 在离心管中加入130 μl的缓冲液，加入20 μl已配好的1 M的DMPO溶液，再加入20 μl底物储存液，10 μl的1 mM H2O2溶液，最后加入20 μl HRP触发反应。
6. 涡旋振荡离心管，加入到进样系统中，检测图谱。
7. 加样后调节光谱并得到图谱。各物质的终浓度为：100 mM DMPO，10 mM的底物，50 μM H2O2，10 μM HRP。
数据和操作流程由Bruker公司友情提供
参考文献
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