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相关概念视频

2° Amines to N-Nitrosamines: Reaction with NaNO201:20

2° Amines to N-Nitrosamines: Reaction with NaNO2

Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
Nuclear Overhauser Enhancement (NOE)01:06

Nuclear Overhauser Enhancement (NOE)

Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling. This phenomenon, called the nuclear Overhauser enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring spin-active...
Nitrosation of Enols01:19

Nitrosation of Enols

The nitrosation reaction is one of the methods of preparing 1,2-diketones. The enol tautomer of the starting ketone reacts with sodium nitrite in hydrochloric acid, generating the 1,2-diketone after hydrolysis.
Capillary Electrophoresis: Applications01:30

Capillary Electrophoresis: Applications

Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...

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一种Se-nitrososelenol的分离:一种与蛋白质Se-nitrosation相关的新一类活性物种.

Keiichi Shimada1, Kei Goto, Takayuki Kawashima

  • 1Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.

Journal of the American Chemical Society
|October 14, 2004
PubMed
概括

研究人员合成了一种稳定的Se-nitrososelenol,一种新型的氧化 (NO) 衍生物. 这种化合物为NO介导的细胞功能提供了化学洞察力,包括对谷氨过氧化酶 (GPx) 的失活.

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科学领域:

  • 生物化学 生物化学
  • 化学生物学 化学生物学
  • 药用化学 医学化学

背景情况:

  • 氧化 (NO) 是生理过程中至关重要的信使分子.
  • 据假设,单蛋白的化会调节NO依赖的细胞功能,例如谷氨酸过氧化酶 (GPx) 不活化.
  • 对于Se-化物种,化学数据有限.

研究的目的:

  • 合成和描述一个稳定的Se-nitrososelenol (RSeNO),一种新的NO衍生物类.
  • 阐明涉及烯蛋白的NO介导细胞功能的化学基础.
  • 为了提供化学证据,证明GPx被NO无活化的拟议机制.

主要方法:

  • 合成一个稳定的Se-nitrososelenol (RSeNO).
  • 使用X射线晶体学进行表征.
  • 使用光谱方法进行表征.
  • 从S-nitrosothiol转化为selenol的转化的证明.

主要成果:

  • 一种稳定的Se-nitrososelenol (RSeNO) 已成功合成并完全表征.
  • 这项研究提供了关于Se-nitrosated物种的第一个化学信息.
  • 通过从S-nitrosothiol转化为selenol的转化证明了Se-nitrososelenol的形成.

结论:

  • 一个新型的NO衍生物类,Se-nitrososelenol,已经合成和特征.
  • 这一发现为NO介导的细胞过程提供了关键的化学见解.
  • 这些结果支持了NO介导GPx失活的拟议机制.