溶解した酸素・レドックスは,超音波で溶解したエミュルシブ・ウォーターのマイクロドロップルにおける過酸化水素とヒドロキシル・ラジカル源である

Abdelilah Asserghine^1,2, Aravind Baby^1,3, Jeanne N'Diaye^1,2

¹Department of Chemistry, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, United States.

Journal of the American Chemical Society

|March 25, 2025

まとめ

超音波で溶解した酸素の微小滴は反応性酸素種を生成する. この発見はこれらの種のリドックス起源を明らかにし,スケーラブルな化学変換を可能にします.

科学分野:

* 物理化学
* ソノケミストリー
* 電気化学

背景:

* 超音波エミュルシブ水マイクロドロップルは,触媒のない化学反応を容易にする.
* SEWMにおける反応性中間物質と酸化還元過程の起源は不明である.
* これらのメカニズムを理解することは,SEWMアプリケーションの最適化に不可欠です.

研究の目的:

SEWMにおける活性酸素種 (ROS) の主要な源を特定する.
* ROSの生成を制御する酸化還元メカニズムを解明する.
* SEWMベースの反応を拡大する可能性を調査する.

主な方法:

水素過酸化物 (H2O2) の検出のための微電気化学的方法
* H2O2の起源を追跡するための同位体分析
* 電子スピン共鳴 (ESR) とDMPOスピントラップを基質検出のために (例えば,OH•).

主要な成果:

* 溶けた酸素 (O2) は,ヒドロキシル基 (OH•) とH2O2を含むROSの主な源として特定されました.
* H2O2の生成は O2含有量と相関しており,還元経路に関連しています.
継続的なO2バブルと超音波による1時間以内に達成された重要なH2O2蓄積 (∼88 mM).

結論:

*溶解したO2は,SEWMにおけるROSの主要な前駆体であり,レドックスプロセスによって駆動されます.
* SEWMは効果的な二相リドックスマイクロリアクターとして機能します.
* SEWMは化学合成のための伝統的な電解剤に代わるスケーラブルな代替手段として支持されています.

さらに関連する動画

08:36

An Atmospheric Pressure Plasma Setup to Investigate the Reactive Species Formation

Published on: November 3, 2016

9.9K

13:17

Manufacture of Concentrated, Lipid-based Oxygen Microbubble Emulsions by High Shear Homogenization and Serial Concentration

Published on: May 26, 2014

14.9K

関連する概念動画

01:46

Oxidative Cleavage of Alkenes: Ozonolysis

9.8K

In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.

9.8K

01:12

Solvents

64.0K

A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
A...

64.0K

00:54

Radical Formation: Homolysis

3.5K

A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.

3.5K

01:17

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...

2.8K

02:23

Autoxidation of Ethers to Peroxides and Hydroperoxides

7.3K

Ethers represent a class of chemical compounds that become more dangerous with prolonged storage because they tend to form explosive peroxides when standing in the air. Autoxidation is the spontaneous oxidation of a compound in air. In the presence of oxygen, ethers slowly oxidize to form hydroperoxides and dialkyl peroxides.

7.3K

01:24

Peroxisomes

8.9K

Peroxisomes are specialized organelles present in fungi, plant, and animal cells. It can vary in number, size, morphology, and activity depending on the type of tissue and the nutritional state of the cell. For example, cells with active lipid metabolism, such as adipocytes, neurons, and hepatocytes, have more peroxisomes than other cells in the body. Besides their primary role in breaking down complex organic molecules, peroxisomes can also synthesize specific macromolecules and participate in...