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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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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...
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Physiological Pharmacokinetic Models: Incorporating Hepatic Transporter-Mediated Clearance01:07

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Drug transporters are critical in drug absorption, distribution, and excretion processes. They should be included in physiological-based pharmacokinetic (PBPK) models, which help predict human drug disposition. However, predicting this is challenging during drug development, especially when liver transport is involved. However, with a realistic representation of body transport processes, an accurate model may be possible.
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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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One-Compartment Open Model for Extravascular Administration: Zero-Order Absorption Model01:12

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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.
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Evaluation of Drug Sorption to PVC- and Non-PVC-based Tubes in Administration Sets Using a Pump
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Coarse-Grained Modeling of Drug Absorption into Plasticized PVC.

Meriem Sahnoune Millot1, Julien Devémy1, Philip Chennell2

  • 1Université Clermont Auvergne, CNRS, Clermont Auvergne INP, Institut de Chimie de Clermont-Ferrand, F-63000 Clermont-Ferrand, France.

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Summary
This summary is machine-generated.

Drug losses during medical infusions are reduced by understanding how drugs interact with plastic (PVC) devices. This study uses advanced simulations to model drug absorption, improving infusion therapy safety and effectiveness.

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Area of Science:

  • Computational chemistry and materials science
  • Pharmaceutical sciences and drug delivery

Background:

  • Drug losses during intravenous infusions are a significant issue, often caused by drug adsorption and absorption into medical devices.
  • Plasticized poly(vinyl chloride) (PVC) is a common material in medical devices, but its interaction with drug formulations is not fully understood at a molecular level.
  • Existing molecular simulation methods struggle to capture the long time and length scales required to study drug absorption processes in polymers.

Purpose of the Study:

  • To extend molecular understanding of drug-polymer interactions using a coarse-grained simulation framework.
  • To investigate drug absorption within plasticized PVC matrices containing DEHT or TOTM plasticizers.
  • To develop a transferable computational framework for modeling drug-polymer interactions over extended time scales.

Main Methods:

  • Utilized the Martini 3 coarse-grained framework to model drug absorption into plasticized PVC.
  • Employed a top-down approach to refine intermolecular interactions, optimizing solute-water and solute-PVC nonbonded interactions against experimental partitioning data.
  • Combined potential of mean force (PMF), Bennett acceptance ratio (BAR), and long equilibrium simulations to analyze thermodynamic and kinetic aspects of drug sorption.

Main Results:

  • Successfully modeled drug absorption within plasticized PVC matrices, providing insights into the underlying molecular mechanisms.
  • Quantified both the thermodynamic and kinetic parameters governing drug sorption into the polymer.
  • Established a refined coarse-grained model transferable to various drug-polymer systems.

Conclusions:

  • The developed coarse-grained framework enables accurate modeling of drug-polymer interactions over relevant time scales.
  • This approach bridges the gap between atomistic simulations and experimental observations of drug loss during infusions.
  • The study paves the way for simulating complete infusion systems, including complex formulations and excipients, to optimize drug delivery.