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相关概念视频

The Calvin Benson Cycle01:46

The Calvin Benson Cycle

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Ribulose 1,5- bisphosphate carboxylase/oxygenase (RuBisCo) is a critical enzyme that catalyzes carbon dioxide assimilation during photosynthesis. However, it is an inefficient enzyme, having an extremely slow catalytic rate. A typical enzyme can process about a thousand molecules per second; however, RuBisCo fixes only around three-carbon dioxides per second. Photosynthetic cells compensate for this slow rate by synthesizing very high amounts of RuBisCo, making it the most abundant single...
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The Electron Transport Chain01:30

The Electron Transport Chain

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The electron transport chain or oxidative phosphorylation is an exothermic process in which free energy released during electron transfer reactions is coupled to ATP synthesis. This process is a significant source of energy in aerobic cells, and therefore inhibitors of the electron transport chain can be detrimental to the cell's metabolic processes.
Inhibitors of the electron transport chain
Rotenone, a widely used pesticide, prevents electron transfer from Fe-S cluster to ubiquinone or Q...
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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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Oxidation of Phenols to Quinones01:17

Oxidation of Phenols to Quinones

2.8K
In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
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Electron Transport Chain: Complex III and IV01:43

Electron Transport Chain: Complex III and IV

6.8K
During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
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Radical Autoxidation01:20

Radical Autoxidation

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The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
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相关实验视频

Updated: Jun 5, 2026

Detection of Nitric Oxide and Superoxide Radical Anion by Electron Paramagnetic Resonance Spectroscopy from Cells using Spin Traps
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Detection of Nitric Oxide and Superoxide Radical Anion by Electron Paramagnetic Resonance Spectroscopy from Cells using Spin Traps

Published on: August 18, 2012

基被 stilbenoids 捕获的方法

Rosario Zamora1, Francisco J Hidalgo1

  • 1Instituto de la Grasa, CSIC, Carretera de Utrera km 1, Campus Universitario - Edificio 46, 41013 Seville, Spain.

Food chemistry
|April 25, 2025
PubMed
概括

像白醇这样的stilbenoids可以捕获o-quinones,形成二二氧化和二二二醇. 在温和的条件下,这些添加物迅速形成,而二二二氧化物更容易产生.

科学领域:

  • 自然产品 化学 化学
  • 有机反应机制 有机反应机制
  • 光谱学分析的分析.

背景情况:

  • 斯蒂尔贝诺因,包括白醇,乙烯和piceatannol,是具有潜在生物活性的天然化合物.
  • o-金是参与各种生物过程和氧化应激的反应性物种.
  • 了解stilbenoids和o-quinones之间的相互作用对于阐明它们的生化作用至关重要.

研究的目的:

  • 为了研究 stilbenoids 与o-quinones 的反应性.
  • 描述由这些反应形成的添加物.
  • 阐明反应机制和影响 adduct 形成的因素.

主要方法:

  • 选择的stilbenoids (复星,,piceatannol) 与o-quinones (4-methylcatechol quinone,hydroxytyrosol quinone) 的反应. 这两种类型的酸的作用是:
  • 反应产品的隔离和净化.
  • 使用一维和二维核磁共振 (NMR) 谱学和质谱学 (MS) 的结构性表征.

主要成果:

  • 确定了两种类型的添加物:二二[b][1,4]二氧化物 (1) 和二二硫-7-ols (2).
  • 在低/室温和中性/轻微酸性pH下,通过对stilbenoid的乙烯链接器的反应迅速形成吸附物.
关键词:
3 - 氧醇 (PubChem ID: 82755) 的使用情况4 - 甲基甲基醇 (PubChem ID: 9958) 的使用情况碳氨酸-胺反应的反应碳-反应的反应食品碳烯原子的使用方法在O-基因子中,O-基因子是O-基因子.皮塞坦诺利 (PubChem ID: 667639) 是一个聚乙烯 (PubChem 标识:5281727) 是一种有反应性的碳基基.复星 (PubChem ID: 445154) 是一种斯蒂尔贝诺伊德是一种类型.

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  • 尽管活性能量相似,但二二二氧化 (1) 的产量高于二二二-7-ols (2),尽管活性能量相似.
  • 提出了一种zwitterionic中间机制来解释有限的同位素形成.

    • 结论:

    • 斯蒂尔贝诺伊德通过添加反应有效地捕获o-氨酸.
    • 反应途径有利于二二二氧化添加物的形成.
    • 该研究提供了对 stilbenoids 和 quinones 之间的化学相互作用的见解,这与它们的生物功能有关.