Related Experiment Video
Updated: Jul 1, 2026
05:59
Green Synthesis of Quinoline-Based Ionic Liquid
Published on: September 27, 2024
Solubility properties of chlorhexidine salts
Pengyung Zeng1, Aruna Rao, Timothy Scott Wiedmann
1Department of Pharmaceutics, University of Minnesota, Minneapolis, MN, USA.
Drug Development and Industrial Pharmacy
|September 12, 2008
Summary
Chlorhexidine (CHX) solubility varies with salt type. Gluconate boosts CHX diacetate solubility, but CHX dichloride remains poorly soluble, potentially limiting dental applications.
Area of Science:
- Oral microbiology
- Physical chemistry
Background:
- Chlorhexidine (CHX) is a widely used antiseptic for oral bacterial infections.
- The solubility of CHX is a critical factor for its effective delivery and formulation, particularly in dental applications.
- Previous studies indicate that the presence of specific salts influences CHX solubility.
Purpose of the Study:
- To investigate the impact of different salt forms on Chlorhexidine (CHX) solubility in aqueous solutions.
- To elucidate the mechanism by which gluconate ions affect CHX solubility, specifically for CHX diacetate and CHX dichloride.
- To assess the implications of CHX solubility characteristics for the development of dental slow-release formulations.
Main Methods:
- Solubility studies of Chlorhexidine (CHX) salts in the presence of varying counter-ions (e.g., gluconate, chloride).
- Investigation of potential solubilization mechanisms, including mixed micelle formation.
- Evaluation of CHX concentrations achievable under conditions simulating the oral environment.
Main Results:
- Gluconate significantly enhances the solubility of Chlorhexidine diacetate, likely via mixed micelle formation exceeding the critical micelle concentration.
- Conversely, gluconate ions show limited solubilization of Chlorhexidine dichloride.
- Achieving high concentrations of CHX dichloride is challenging, especially in the presence of physiological chloride levels.
Conclusions:
- The salt form of Chlorhexidine (CHX) critically determines its solubility in solution.
- Gluconate is effective in increasing CHX diacetate solubility but not CHX dichloride solubility.
- The limited solubility of CHX dichloride in physiological chloride concentrations may pose challenges for developing effective dental slow-release formulations.
Related Concept Videos
02:55Solubility of Ionic Compounds
Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
03:07Solubility Equilibria
Solubility equilibria are established when the dissolution and precipitation of a solute species occur at equal rates. These equilibria underlie many natural and technological processes, ranging from tooth decay to water purification. An understanding of the factors affecting compound solubility is, therefore, essential to the effective management of these processes. This section applies previously introduced equilibrium concepts and tools to systems involving dissolution and precipitation.
The...
The...
03:00Solubility
Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules, atoms, and/or ions)...
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules, atoms, and/or ions)...
04:01Factors Affecting Solubility
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
01:09Solubility Equilibria: Overview
When a substance such as sodium chloride is added to water, it dissolves, forming an aqueous solution. The extent of dissolution is called solubility. The process of dissolution can exist in equilibrium, just like other chemical processes. Solubility equilibria are also called precipitation equilibria because the process of solubility can be reversible. The reverse of the solubility process is called precipitation.
Solubility is important in biological and environmental processes. A notable...
Solubility is important in biological and environmental processes. A notable...
01:12Solvents
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...
A...