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Related Concept Videos

Bioavailability Enhancement: Drug Solubility Enhancement01:16

Bioavailability Enhancement: Drug Solubility Enhancement

278
Body:Bioavailability is a critical factor in determining a drug's effectiveness. It refers to the proportion of a drug that enters the circulation when introduced into the body and is, as a result, able to have an active effect. Enhancing bioavailability is essential for drugs with poor solubility, as it can significantly impact their therapeutic efficacy. Various methods are employed to increase the solubility of drugs, thereby enhancing their bioavailability.Micronization and nanonization are...
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Factors Affecting Dissolution: Particle Size and Effective Surface Area01:23

Factors Affecting Dissolution: Particle Size and Effective Surface Area

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Dissolution kinetics, an essential aspect of oral drug delivery, is significantly influenced by the drug's particle size. According to the Noyes-Whitney dissolution model, the dissolution rate correlates directly with the drug's surface area. The larger the surface area, the higher the drug's solubility in water, leading to a faster drug dissolution rate. Reducing particle size increases the effective surface area, enhancing the dissolution process. Micronization and nanosizing are...
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Factors Affecting Solubility04:01

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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:
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Bioavailability Enhancement: Drug Permeability Enhancement01:27

Bioavailability Enhancement: Drug Permeability Enhancement

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Body:After oral administration, poor permeability often limits the rate at which drugs are absorbed through the intestinal epithelium. Enhancing drug permeability is crucial for effective therapy, and several strategies have been developed to overcome this challenge.One effective strategy involves the use of lipid-based formulations. These formulations enhance dissolution and solubility, targeting physiological mechanisms to increase drug absorption. This includes stimulating bile salt...
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Solubility03:00

Solubility

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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,...
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Physical Properties Affecting Solubility02:19

Physical Properties Affecting Solubility

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Solutions of Gases in Liquids
As for any solution, the solubility of a gas in a liquid is affected by the attractive intermolecular forces between solute and solvent species. Unlike solid and liquid solutes, however, there is no solute-solute intermolecular attraction to overcome when a gaseous solute dissolves in a liquid solvent since the atoms or molecules comprising a gas are far separated and experience negligible interactions. Consequently, solute-solvent interactions are the sole...
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Related Experiment Video

Updated: Feb 19, 2026

Solubility of Hydrophobic Compounds in Aqueous Solution Using Combinations of Self-assembling Peptide and Amino Acid
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Solubility of Hydrophobic Compounds in Aqueous Solution Using Combinations of Self-assembling Peptide and Amino Acid

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Improvement in aqueous solubility achieved via small molecular changes.

Michael A Walker1

  • 1Dart Neuroscience, 12278 Scripps Summit Dr., San Diego, CA 92131, USA.

Bioorganic & Medicinal Chemistry Letters
|November 5, 2017
PubMed
Summary

Improving drug solubility is key in drug discovery. Subtle structural modifications, rather than adding polar groups, can enhance solubility while maintaining drug activity and safety.

Keywords:
Aqueous solubilityDrug propertiesGeneral Solubility Equation (GSE)HydrophobicityPhysicochemical properties

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Area of Science:

  • Medicinal Chemistry
  • Drug Discovery
  • Pharmacology

Background:

  • Poor aqueous solubility is a major challenge in developing new drugs.
  • Current methods like adding polar groups or appendages can negatively impact drug activity, pharmacokinetics (PK), and toxicity.
  • Alternative strategies are needed to improve solubility without compromising drug properties.

Purpose of the Study:

  • To explore subtle structural modifications that enhance drug solubility.
  • To identify alternative approaches to improve solubility beyond traditional polarity-based methods.
  • To maintain or improve drug activity and safety profiles during solubility enhancement.

Main Methods:

  • Analysis of structural modifications impacting solubility.
  • Evaluation of changes in hydrophobicity, saturation, and stereochemistry.
  • Assessment of the effects of small hydrophobic group incorporation (e.g., fluorine, methyl).

Main Results:

  • Excising non-essential hydrophobic groups can improve solubility.
  • Modifying stereochemistry and regiochemistry offers solubility benefits.
  • Adjusting the degree of unsaturation and adding small hydrophobic groups like fluorine or methyl can enhance solubility.

Conclusions:

  • Subtle structural modifications represent a viable strategy for improving drug solubility.
  • These methods offer an alternative to traditional approaches, potentially avoiding issues with activity, PK, and toxicity.
  • Careful manipulation of molecular structure can lead to enhanced solubility and improved drug development outcomes.