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Related Concept Videos

Factors Influencing Drug Absorption: Anatomical Parameters01:23

Factors Influencing Drug Absorption: Anatomical Parameters

Drug absorption involves the movement of drugs from the point of administration into the systemic circulation. Initially, Gastrointestinal (GI) motility propels the drug through the digestive tract and into the stomach. However, the stomach's high acidity and limited surface area restrict its role in drug absorption for most drugs. The drug then moves from the stomach to the small intestine via gastric emptying, which can be slowed by various factors, including interactions with other...
Bioavailability Enhancement: Drug Permeability Enhancement01:27

Bioavailability Enhancement: Drug Permeability Enhancement

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 secretion,...
Methods for Studying Drug Absorption: In situ01:09

Methods for Studying Drug Absorption: In situ

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.
The Doluisio method involves perfusing a prepared segment of a rat's small intestine with a solution of radiolabeled drug and a non-absorbable marker. This helps to differentiate between absorbed and non-absorbed drug concentrations. The intestinal segment is connected at both ends using tubing and syringes,...
Drug Absorption: Factors Affecting GI Absorption01:19

Drug Absorption: Factors Affecting GI Absorption

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

Factors Influencing Drug Absorption: Physicochemical Parameters

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...
Methods for Studying Drug Absorption: In vitro01:16

Methods for Studying Drug Absorption: In vitro

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.
The diffusion cell method uses a two-compartment cell, including a donor compartment with the drug solution, which simulates the environment where the drug is applied, and a receptor compartment with a buffer solution, which simulates the environment...

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Related Experiment Video

Updated: May 24, 2026

Analyzing Beneficial Effects of Nutritional Supplements on Intestinal Epithelial Barrier Functions During Experimental Colitis
08:58

Analyzing Beneficial Effects of Nutritional Supplements on Intestinal Epithelial Barrier Functions During Experimental Colitis

Published on: January 5, 2017

Perspective on improving passive human intestinal absorption.

Samuel H Yalkowsky1

  • 1Department of Pharmaceutical Sciences, College of Pharmacy, University of Arizona, Tucson, Arizona 85721, USA. yalkowsky@pharmacy.arizona.edu

Journal of Pharmaceutical Sciences
|March 1, 2012
PubMed
Summary
This summary is machine-generated.

Common drug solubilization methods like pH adjustment and micellization do not enhance drug absorption. These techniques, while increasing dissolved drug concentration, are negated by physiological conditions, limiting their therapeutic benefit.

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Ex Vivo Intestinal Sacs to Assess Mucosal Permeability in Models of Gastrointestinal Disease
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Ex Vivo Intestinal Sacs to Assess Mucosal Permeability in Models of Gastrointestinal Disease

Published on: February 9, 2016

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Last Updated: May 24, 2026

Analyzing Beneficial Effects of Nutritional Supplements on Intestinal Epithelial Barrier Functions During Experimental Colitis
08:58

Analyzing Beneficial Effects of Nutritional Supplements on Intestinal Epithelial Barrier Functions During Experimental Colitis

Published on: January 5, 2017

Ex Vivo Intestinal Sacs to Assess Mucosal Permeability in Models of Gastrointestinal Disease
06:04

Ex Vivo Intestinal Sacs to Assess Mucosal Permeability in Models of Gastrointestinal Disease

Published on: February 9, 2016

Area of Science:

  • Pharmaceutical Sciences
  • Drug Delivery
  • Biopharmaceutics

Background:

  • Solubilization techniques are crucial for improving drug dissolution in the gastrointestinal (GI) lumen.
  • Methods include pH adjustment, cosolvency, complexation, and micellization to exceed saturated drug concentrations.

Purpose of the Study:

  • To evaluate the actual impact of common solubilization methods on drug absorption.
  • To determine if enhanced dissolution translates to improved membrane transport and overall absorption.

Main Methods:

  • Analysis of how solubilizing agents affect the membrane-water distribution coefficient.
  • Assessment of formulation dilution effects in the GI tract, including pH changes, cosolvency decrease, and complex/micelle dissociation.

Main Results:

  • Solubilizing agents reduce the membrane-water distribution coefficient, negating dissolution gains.
  • GI fluid dilution causes pH shifts, cosolvency reduction, and breakdown of complexes/micelles.
  • These factors collectively prevent increased membrane transport compared to unformulated drugs.

Conclusions:

  • Solubilization methods do not improve membrane transport-limited drug absorption.
  • The benefits of enhanced dissolution are nullified by physiological dilution and agent dissociation.
  • Drug absorption is unlikely to be enhanced beyond that of a simple suspension.