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Related Concept Videos

Solvents01:12

Solvents

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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.
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Actin Filament Depolymerization01:19

Actin Filament Depolymerization

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Actin filaments (F-actin) are composed of actin subunits. The dissociation of actin monomers can occur from either end of F-actin. The rate of dissociation is faster from the minus-end or the pointed end, where the actin subunits exist with a bound ADP, together known as ADP-actin. The depolymerization of F-actin is aided by proteins, including the actin-depolymerizing factor (ADF) and cofilin family of proteins, gelsolin, and glia maturation factor (GMF).
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Mixtures of Acids03:27

Mixtures of Acids

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The pH of a solution containing an acid can be determined using its acid dissociation constant and its initial concentration. If a solution contains two different acids, then its pH can be determined using one of several methods depending upon the relative strength of the acids and their dissociation constants.
A Mixture of a Strong Acid and a Weak Acid
In a mixture of a strong acid and a weak acid, the strong acid dissociates completely and becomes a source of almost all the hydronium ions...
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Mixtures of Acids01:19

Mixtures of Acids

1.1K
The pH of a solution containing an acid can be determined using its acid dissociation constant and initial concentration. If a solution contains two different acids, then its pH can be determined using one of several methods depending on the relative strength of the acids and their dissociation constants.
In a strong and weak acid mixture, the strong acid dissociates completely and becomes a source of almost all the hydronium ions present in the solution. In contrast, the weak acid shows...
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Titration in Nonaqueous Solvents01:16

Titration in Nonaqueous Solvents

1.4K
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
Dynamic Equilibrium02:20

Dynamic Equilibrium

63.4K
A reversible chemical reaction represents a chemical process that proceeds in both forward (left to right) and reverse (right to left) directions. When the rates of the forward and reverse reactions are equal, the concentrations of the reactant and product species remain constant over time and the system is at equilibrium. A special double arrow is used to emphasize the reversible nature of the reaction. The relative concentrations of reactants and products in equilibrium systems vary greatly;...
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Updated: Feb 12, 2026

Extraction of Lignin with High &#946;-O-4 Content by Mild Ethanol Extraction and Its Effect on the Depolymerization Yield
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Efficient Lignin Dissolution and Enzymatic Depolymerization in Ethylene Glycol-Based Deep Eutectic Solvent Mixtures:

Julian Schilke1, Miriam Sprick2, Eduardo Schneider2

  • 1Institute for Biochemistry, Biotechnology and Bioinformatics, Technische Universität Braunschweig, Spielmannstraße 7, Braunschweig 38106, Germany.

The Journal of Physical Chemistry. B
|February 11, 2026
PubMed
Summary

Deep eutectic solvents (DES) mixed with glycine buffer enhance lignin solubility for enzymatic depolymerization. This breakthrough enables efficient production of aromatic chemicals from lignin, a renewable resource.

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Area of Science:

  • Biomass Conversion
  • Green Chemistry
  • Enzymatic Catalysis

Background:

  • Lignin is a key source for aromatic chemicals but its low solubility hinders enzymatic depolymerization.
  • Cosolvents are typically needed to increase lignin solubility for efficient processing.

Purpose of the Study:

  • To investigate ethylene glycol/choline chloride (EG:ChCl)-based deep eutectic solvents (DES) combined with glycine buffer for lignin dissolution.
  • To optimize solvent systems for high-concentration lignin depolymerization using β-etherase.

Main Methods:

  • Utilized mixtures of EG:ChCl DES and glycine buffer for lignin dissolution.
  • Performed β-etherase-catalyzed depolymerization with high lignin concentrations.
  • Employed molecular dynamics (MD) simulations to analyze solvent-lignin interactions.

Main Results:

  • Achieved high lignin concentrations (up to 30 g L-1) without inhibiting enzyme activity.
  • Identified optimal conditions (20 g L-1 lignin, 50% v/v EG:ChCl 4:1) for maximum yield of guaiacylhydroxypropanone and syringylhydroxypropanone.
  • MD analyses revealed the roles of EG and glycine in lignin solubility and DES ratio in solvation dynamics.

Conclusions:

  • EG:ChCl DES and glycine buffer systems are effective for lignin dissolution and enzymatic depolymerization.
  • Solvent composition significantly influences both lignin solubility and the yield of depolymerization products.
  • Understanding molecular interactions is crucial for optimizing lignin valorization strategies.