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Methods for Studying Drug Absorption: In vitro01:16

Methods for Studying Drug Absorption: In vitro

288
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...
288
Methods for Studying Drug Absorption: In situ01:09

Methods for Studying Drug Absorption: In situ

323
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,...
323

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Related Experiment Video

Updated: Aug 24, 2025

An Intestine/Liver Microphysiological System for Drug Pharmacokinetic and Toxicological Assessment
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Development of an In Vitro System To Emulate an In Vivo Subcutaneous Environment: Small Molecule Drug Assessment.

Hao Lou1,2, Michael J Hageman1,2

  • 1Department of Pharmaceutical Chemistry, University of Kansas, Lawrence, Kansas66047, United States.

Molecular Pharmaceutics
|October 24, 2022
PubMed
Summary
This summary is machine-generated.

A novel in vitro system, the Emulator of Subcutaneous Absorption and Release (ESCAR), accurately predicts subcutaneous drug release. This system simplifies drug development by establishing in vitro-in vivo correlations, potentially waiving the need for animal studies.

Keywords:
3D printingDesign of Experiment (DoE)Monte Carlo simulationin vitro systemin vitro−in vivo correlation (IVIVC)machine learningsubcutaneous route of administration

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Area of Science:

  • Pharmacokinetics and Drug Delivery
  • Biomedical Engineering
  • Materials Science

Background:

  • Existing in vitro systems for subcutaneous (SC) drug product development have limitations.
  • A reliable in vitro model is needed to better emulate the in vivo SC environment for drug fate prediction.

Purpose of the Study:

  • To develop a novel in vitro system, the Emulator of Subcutaneous Absorption and Release (ESCAR), to emulate the SC environment.
  • To predict drug fate in SC delivery and establish in vitro-in vivo correlations (IVIVC) for SC drug products.

Main Methods:

  • ESCAR was designed using CAD and fabricated with 3D printing, featuring chambers for blood and lymphatic uptake pathways.
  • Design of Experiments (DoE) factor screening identified critical parameters influencing drug release (e.g., hyaluronic acid concentration).
  • In vitro-in vivo correlation (IVIVC) studies using griseofulvin suspension were performed to validate the model's predictive capability.

Main Results:

  • Hyaluronic acid concentration was identified as a critical parameter for SC drug release.
  • Injection volume and position showed minimal impact on drug release in the ESCAR system.
  • A Level A IVIVC model successfully correlated in vitro release profiles with in vivo pharmacokinetic profiles.

Conclusions:

  • The ESCAR system effectively emulates the SC environment and predicts drug release and absorption.
  • ESCAR facilitates formulation development and bioequivalence studies for SC drug products, potentially reducing the need for in vivo testing.
  • The developed IVIVC model supports the use of ESCAR for quality control and regulatory submissions of SC drug products.