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Related Concept Videos

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 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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Methods for Studying Drug Absorption: In vitro01:16

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In vitro experiments are crucial for understanding the transport and absorption of drugs through biological materials. These studies employ varied methods such as the diffusion cell method, the everted sac technique, and the everted ring technique.
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Methods for Studying Drug Absorption: In situ01:09

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In situ experiments, such as the Doluisio method and Single-Pass Perfusion technique, provide critical insights into drug uptake by simulating in vivo conditions for drug absorption.
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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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Drug Absorption: Factors Affecting GI Absorption01:19

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The process of oral drug absorption can be influenced by several factors. Weakly acidic drugs tend to be absorbed more readily from the stomach due to their nonionized state. However, absorption may be less efficient in the upper intestine, where drugs are often ionized. Interestingly, despite the stomach's apparent advantage for drug absorption, its mucous layer can hinder diffusion. Its surface area is also smaller than the intestine's, which can further slow down the absorption rate.
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Updated: Sep 8, 2025

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Drug Solubility in Human Colonic Fluids and Comparison to Small Intestinal and Simulated Fluids.

Sebastian Steigert1, Joachim Brouwers1, Tim Vanuytsel2

  • 1Drug Delivery and Disposition, KU Leuven, Gasthuisberg ON2, Herestraat 49 - box 921, Leuven 3000, Belgium.

Molecular Pharmaceutics
|June 26, 2025
PubMed
Summary
This summary is machine-generated.

Human colon drug solubility is comparable to the small intestine for most drugs, but the small intestine is better for lipophilic compounds. This research provides crucial data for predicting drug absorption in the colon.

Keywords:
absorptioncolondrug solubilityoral drug deliverysimulated mediasmall intestine

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Area of Science:

  • Pharmacokinetics and Drug Delivery
  • Gastrointestinal Physiology
  • Formulation Science

Background:

  • Colonic drug absorption is vital for colon-targeted and extended-release formulations.
  • Drug solubility is a critical factor for gastrointestinal tract uptake.
  • Limited data exists on colonic drug solubility and its relation to luminal fluid composition.

Purpose of the Study:

  • To measure and compare apparent drug solubility in human colonic and small intestinal fluids.
  • To assess the influence of luminal fluid composition on drug solubility.
  • To evaluate the predictive accuracy of simulated media for colonic and intestinal drug solubility.

Main Methods:

  • Measured apparent solubility of eight drugs in pooled human proximal colon and small intestine aspirates.
  • Characterized the composition of pooled luminal fluids.
  • Compared solubility in human fluids with simulated intestinal fluid (SIF) and buffers.

Main Results:

  • Colonic and small intestinal drug solubility were similar for most tested drugs.
  • The small intestine showed higher solubilizing capacity for lipophilic drugs (fenofibrate, ticagrelor).
  • Danoprevir exhibited extensive degradation in both fluids; solubility predictions were partially improved by SIF, but colonic predictions remained challenging.

Conclusions:

  • Human colonic drug solubility data is scarce, hindering formulation development.
  • Lipophilic drug solubility is significantly higher in the small intestine than the colon.
  • This study provides reference data crucial for developing better in vitro and in silico tools for predicting colonic drug solubility.