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Related Concept Videos

Bioavailability Enhancement: Drug Solubility Enhancement01:16

Bioavailability Enhancement: Drug Solubility Enhancement

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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: Drug pKa, Lipophilicity and GI pH01:21

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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 Dissolution01:27

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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...
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Factors Influencing Drug Absorption: Physicochemical Parameters01:22

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The physicochemical characteristics of drugs play a crucial role in formulating stable and bioavailable drug products. The solubility of a drug, governed by the varying pH along the GI tract and its dissociation constant (pKa), is pivotal in determining its ionization state and absorption rate. Notably, weak acids and bases remain unionized and are absorbed more rapidly.
Enhanced drug absorption can be achieved by reducing particle sizes and increasing surface areas, thereby facilitating...
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Factors Affecting Dissolution: Drug Permeability, Stability and Stereochemistry01:20

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Orally administered drugs primarily enter the systemic circulation via passive diffusion through the intestinal membranes. The drug's absorption is influenced by drug stability in the gastrointestinal GI tract, membrane permeability, the surface area available for absorption, luminal drug concentration, and residence time in the lumen. Drug permeability can be enhanced by adjusting the lipophilicity, polarity, or molecular size of the drug, promoting its passive transport across intestinal...
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Drug Absorption Mechanism: Passive Membrane Transport01:23

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Passive transport is a method of drug absorption where small, lipid-soluble drugs can move across the cell membrane. This movement happens along the concentration gradient, which is a natural flow from higher to lower concentration areas. The speed at which the drug moves is directly related to its lipid–water partition coefficient. This means that the more a drug dissolves in lipids, the faster it diffuses or spreads throughout the body. It is important to note that most drugs are either...
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Related Experiment Video

Updated: Jan 9, 2026

Self-Nanoemulsification of Healthy Oils to Enhance the Solubility of Lipophilic Drugs
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Solubility parameter and oral absorption.

L G Martini1, P Avontuur, A George

  • 1SmithKline Beecham Pharmaceuticals, Harlow, Essex, UK. luigi_g_martini@sbphrd.com

European Journal of Pharmaceutics and Biopharmaceutics : Official Journal of Arbeitsgemeinschaft Fur Pharmazeutische Verfahrenstechnik E.V
|December 28, 1999
PubMed
Summary
This summary is machine-generated.

The solubility parameter (delta) effectively predicts oral drug absorption, with optimal values around 22.5 MPa1/2. This method proves more reliable than C Log P for assessing drug absorption potential.

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Area of Science:

  • Pharmacokinetics and Drug Metabolism
  • Physical Chemistry
  • Computational Chemistry

Background:

  • Oral absorption is a critical factor in drug efficacy.
  • Predicting oral absorption is essential for drug development.
  • Traditional predictors like C Log P have limitations.

Purpose of the Study:

  • To evaluate the solubility parameter as a predictor of oral absorption.
  • To compare the predictive power of solubility parameter versus C Log P.
  • To investigate the role of hydrogen bonding in oral absorption.

Main Methods:

  • Determined solubility parameter (delta) using Fedors' group contribution method.
  • Correlated solubility parameter values with experimental oral absorption data.
  • Analyzed the relationship between H-bonding acceptor groups and absorption.
  • Compared results with C Log P values.

Main Results:

  • Compounds with solubility parameters near 22.5 MPa1/2 exhibited good oral absorption.
  • Compounds with high solubility parameters (30-40 MPa1/2) showed poor absorption.
  • A positive correlation was observed between H-bonding acceptor groups and absorption.
  • No clear correlation was found between C Log P and oral absorption.

Conclusions:

  • The solubility parameter is a potentially superior predictor of oral absorption compared to C Log P.
  • Molecular descriptors like solubility parameter and H-bonding capacity are key for absorption prediction.
  • Further research can refine solubility parameter calculations for drug development.