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Solubility

Solubility

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)...

Factors Affecting Dissolution: Drug pKa, Lipophilicity and GI pH

Factors Affecting Dissolution: Drug pKa, Lipophilicity and GI pH

Drug absorption within the gastrointestinal (GI) tract is a complex process influenced by several critical factors, including the site pH, the drug's dissociation constant (pKa), and the drug's lipophilicity. The GI tract exhibits a pH gradient, with an acidic environment in the stomach and a more alkaline environment in the small intestine. This pH variation directly affects the ionization state of drugs.
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Factors Influencing Drug Absorption: Drug Dissolution

Factors Influencing Drug Absorption: Drug Dissolution

The pharmacokinetic journey of drugs from solid oral dosage forms into systemic circulation is multifaceted. It begins with disintegration, a prerequisite ensuring a solid dosage form's subdivision into minute particles. Dissolution occurs next as these granulated entities solubilize in gastrointestinal fluids. This solubilization is crucial for the succeeding stage, permeation, which describes the traversal of the drug across the intestinal membrane and its subsequent entry into the blood...

Solubility Equilibria: Overview

Solubility 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.
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Solubility of Ionic Compounds

Solubility 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.

Solubility Equilibria

Solubility 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.
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Updated: May 24, 2026

Evaluation of Lipid Droplet Size and Fusion in Bovine Hepatic Cells

Evaluation of Lipid Droplet Size and Fusion in Bovine Hepatic Cells

Published on: March 10, 2023

Drug solubility classification in the bovine.

M N Martinez¹, M D Apley

¹Food and Drug Administration Center for Veterinary Medicine, Rockville, MD 20855, USA. marilyn.martinez@fda.hhs.gov

Journal of Veterinary Pharmacology and Therapeutics

|March 15, 2012

Summary

Drug solubility testing for cattle requires different conditions than for humans due to unique gastrointestinal factors. Current human-based criteria may not accurately classify drug solubility in ruminants.

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Area of Science:

Veterinary pharmacology
Drug development
Ruminant physiology

Background:

Current drug solubility testing relies on human pharmaceutical data.
Significant physiological differences exist between ruminant and monogastric gastrointestinal tracts.
These differences impact the suitability of existing solubility test conditions and criteria for cattle.

Purpose of the Study:

To highlight critical differences in ruminant versus monogastric gastrointestinal physiology.
To discuss how these differences affect drug solubility classification in cattle.
To propose alternative perspectives for modifying solubility criteria for ruminants.

Main Methods:

Comparative analysis of gastrointestinal tract characteristics.
Discussion of factors including stomach pH, volume, oral formulation types, and 'highest dose' definition.
Review of existing human pharmaceutical solubility guidelines.

Main Results:

Ruminant gastrointestinal physiology presents unique challenges for standard solubility testing.
Factors such as pH, volume, and formulation type necessitate a species-specific approach.
The definition of 'highest dose' requires re-evaluation for ruminant drug products.

Conclusions:

Existing human-derived solubility criteria are not directly applicable to cattle.
Modification of solubility test conditions and criteria is necessary for accurate drug classification in ruminants.
Further research into ruminant-specific parameters is recommended.