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Related Concept Videos

Methods for Studying Drug Absorption: In situ01:09

Methods for Studying Drug Absorption: In situ

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

Methods for Studying Drug Absorption: In vitro

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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.
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: Apr 17, 2026

In Vitro and In Vivo Approaches to Determine Intestinal Epithelial Cell Permeability
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A Sensitive Medium-Throughput Method to Predict Intestinal Absorption in Humans Using Rat Intestinal Tissue Segments.

Laís Cristina Da Silva1, Taynara Lourenço Da Silva1, Alisson Henrique Antunes1

  • 1Laboratory of Biopharmacy and Pharmacokinetics, School of Pharmacy, Federal University of Goiás, Goiânia, Brazil.

Journal of Pharmaceutical Sciences
|February 19, 2015
PubMed
Summary

A new ex vivo model using rat intestine in Snapwell inserts accurately predicts human drug absorption. This medium throughput screening method offers a viable alternative for early drug development classification.

Keywords:
Biopharmaceutics classification system (BCS)ex vivoin vitro modelsintestinal absorptionpermeabilityrat intestine segments

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Area of Science:

  • Pharmacology
  • Drug Development
  • Biotechnology

Background:

  • Current drug development relies on in vitro, ex vivo, and in vivo methods.
  • Predictive human intestinal absorption models are needed for early-stage drug development.
  • Existing models struggle to balance high throughput with predictive accuracy for gastrointestinal permeability.

Purpose of the Study:

  • To develop a medium throughput screening Snapwell (MTS-Snapwell) ex vivo model.
  • To provide an alternative method for classifying drug permeability.
  • To establish a model with predictive potential for human intestinal absorption.

Main Methods:

  • Utilized rat small intestine tissue segments mounted in Snapwell inserts.
  • Measured unidirectional drug transport (A-B) over time.
  • Assessed tissue viability using transepithelial electric resistance (TEER) and marker transport.

Main Results:

  • Determined apparent permeability (Papp) for six drugs: atenolol, caffeine, cimetidine, metoprolol, theophylline, and ranitidine.
  • Classified drugs into high/low permeability categories based on the Biopharmaceutics Classification System.
  • Achieved a high correlation (r = 0.89) between the model's predictions and human data.

Conclusions:

  • The MTS-Snapwell ex vivo model demonstrates significant predictive capacity for drug permeability.
  • The model shows high correlation with human data, validating its utility.
  • This approach offers a promising tool for early drug development, balancing throughput and predictability.