Video Experimental Relacionado

Updated: Feb 3, 2026

Preparation of Binary and Ternary Deep Eutectic Systems
06:15

Preparation of Binary and Ternary Deep Eutectic Systems

Published on: October 31, 2019

12.8K

Análisis eficiente por electroforesis capilar de antraquinonas y ácidos fenólicos en alimentos funcionales utilizando

Kai-Yang Fan1, Shi-Qi Niu1, Tian Zhang1

  • 1College of Material Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou 311121, PR China.

Food chemistry
|February 1, 2026
PubMed
Resumen

Este estudio presenta una novedosa microemulsión de disolvente eutéctico profundo para la cromatografía electrocinética de microemulsión, que permite la separación y detección eficaces de los componentes de las semillas de Cassia. El método ecológico muestra alta precisión y aplicabilidad para el análisis de antraquinonas y ácidos fenólicos.

Palabras clave:
AntraquinonasSemillas de CassiaDisolvente eutéctico profundo en disolvente eutéctico profundoCromatografía electrocinética de microemulsiónÁcidos fenólicosMetodología de superficie de respuesta

Más Videos Relacionados

Preparation of Biopolymer Aerogels Using Green Solvents08:13

Preparation of Biopolymer Aerogels Using Green Solvents

Published on: July 4, 2016

18.3K
Staining of Proteins in Gels with Coomassie G-250 without Organic Solvent and Acetic Acid07:47

Staining of Proteins in Gels with Coomassie G-250 without Organic Solvent and Acetic Acid

Published on: August 14, 2009

54.8K

Videos de Conceptos Relacionados

Solvents01:12

Solvents

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...
71.1K
Titration in Nonaqueous Solvents01:16

Titration in Nonaqueous Solvents

Most acid-base titrations are performed in an aqueous medium. In aqueous titrations, water competes with weaker acids or bases for proton donation or acceptance, leading to ambiguous endpoints in the titration curve. Water also affects the partial ionization of weak acids or bases. For example, water accepts a proton from acetic acid to form hydronium and acetate ions. The hydronium ion formed is a stronger acid than acetic acid, and the acetate ion is a stronger base than water. As a result,...
1.4K
Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
1.4K
Acidity and Basicity of Alcohols and Phenols02:36

Acidity and Basicity of Alcohols and Phenols

Like water, alcohols are weak acids and bases. This is attributed to the polarization of the O–H bond making the hydrogen partially positive. Moreover, the electron pairs on the oxygen atom of alcohol make it both basic and nucleophilic. Protonation of an alcohol converts hydroxide, a poor leaving group, into water—a good one. The two acid–base equilibria corresponding to ethanol are depicted below.
22.2K
Oxidation of Phenols to Quinones01:17

Oxidation of Phenols to Quinones

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...
4.7K
Composition of Polyprotic Acid Solutions as a Function of pH01:19

Composition of Polyprotic Acid Solutions as a Function of pH

Polyprotic acids of the type H2M constitute two ionizable protons. As a result, on titration with a base, they exhibit two equivalence points in the titration curve. During titration, the species H2M, HM−, and M2− will be present in the solution at different points. The fractions of H2M, HM−, and M2− present at the various instances of the titration are denoted by α0, α1, and α2, respectively.
A graph with the alpha values is plotted against the volume of...
867