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Related Concept Videos

Methods for Studying Drug Absorption: In vitro01:16

Methods for Studying Drug Absorption: In vitro

325
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...
325
Methods for Studying Drug Absorption: In situ01:09

Methods for Studying Drug Absorption: In situ

337
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,...
337
One-Compartment Open Model for Extravascular Administration: First-Order Absorption Model01:15

One-Compartment Open Model for Extravascular Administration: First-Order Absorption Model

295
The first-order absorption model for extravascular administration describes the rate at which a drug is absorbed and eliminated, following the principles of first-order kinetics. This model is vital as it provides a mathematical representation of drug behavior within the body. It also allows for the prediction and interpretation of drug absorption and elimination based on the rate of change in drug concentration over time. This model can be visualized as a plasma concentration-time profile...
295
One-Compartment Open Model for Extravascular Administration: Zero-Order Absorption Model01:12

One-Compartment Open Model for Extravascular Administration: Zero-Order Absorption Model

167
Extravascular administration, such as oral or intramuscular routes, is a non-invasive drug delivery method, often preferred for ease and patient compliance. A key factor here is absorption, which dictates how quickly and effectively the drug enters the bloodstream from the administration site. Absorption follows either zero-order or first-order kinetics.
Zero-order absorption maintains a steady rate irrespective of the amount of drug left to be absorbed, making it a constant process. In the...
167
Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy01:26

Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy

140
This lesson explores three gastrointestinal imaging techniques: radionuclide testing, colonic transit studies, and virtual colonoscopy.
Radionuclide Testing
Radionuclide testing is a sophisticated medical technique for assessing gastrointestinal motility. It focuses on gastric emptying and colonic transit time. Radioactive markers track the movement of food through the digestive system, providing insights into gastrointestinal disorders.
In gastric emptying studies, a meal's liquid and...
140

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Physiologically Based Pharmacokinetic (PBPK) Modeling of Oral Drug Absorption for Integrating Nonclinical Data into Human Pharmacokinetic Predictions.

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Artificial gut Simulator. A scheme to predict intestinal and plasma concentration-time profiles of a weakly basic BCS-II drug, dipyridamole.

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Mechanisms Underlying Gut Hormone Secretion Using the Isolated Perfused Rat Small Intestine
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An Artificial Gut/Absorption Simulator: Description, Modeling, and Validation Using Caffeine.

Krutika Meena Harish Jain1, Hao Helen Hou2, Ronald A Siegel3,4

  • 1Department of Pharmaceutics, University of Minnesota, Minneapolis, MN, 55455, USA.

The AAPS Journal
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PubMed
Summary

Researchers developed an artificial gut simulator (AGS) to test oral drug dissolution and absorption. This tool accurately predicted caffeine

Keywords:
dissolutionin vitromembrane transportoral absorptionpassive diffusion

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Area of Science:

  • Pharmacokinetics and Drug Delivery
  • Biophysical Chemistry

Background:

  • Simulating in vivo drug absorption in vitro is crucial for oral formulation development.
  • Existing methods often lack the physiological relevance needed for accurate prediction.

Purpose of the Study:

  • To develop and validate the artificial gut simulator (AGS) for simultaneous dissolution and absorption testing.
  • To establish an in vitro/in vivo correlation for oral drug formulations.

Main Methods:

  • Constructed the AGS using hollow fibers within a UV spectrophotometric cuvette.
  • Developed and validated a quasi-steady-state absorption model using caffeine (BCS-I).
  • Integrated AGS data into a one-compartment pharmacokinetic (PK) model.

Main Results:

  • The AGS demonstrated a large surface area-to-volume ratio, simulating physiological absorption rates.
  • Optimized AGS parameters mimicked gastric emptying and caffeine absorption.
  • Predicted in vivo caffeine plasma concentrations closely matched experimental data.

Conclusions:

  • The artificial gut simulator (AGS) successfully mimics in vitro drug dissolution and absorption.
  • The developed model provides a framework for in vitro/in vivo correlation studies.
  • Future work will focus on high-permeability, BCS-II supersaturating drug formulations.