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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.
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One-Compartment Open Model for IV Bolus Administration: Estimation of Elimination Rate Constant, Half-Life and Volume of Distribution01:09

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The one-compartment open model is a simplified approach used in pharmacokinetics to understand the distribution and elimination of a drug administered through an intravenous bolus. This model assumes rapid drug dispersal throughout the body and elimination using a first-order process. Key pharmacokinetic parameters, such as the elimination rate constant (k), half-life (t1/2), and the apparent volume of distribution (Vd), can be estimated from this model. The elimination rate is calculated...
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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: Wagner-Nelson and Loo Riegelman Method for ka Estimation01:24

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This lesson introduces two critical methods in pharmacokinetics, the Wagner-Nelson and Loo-Riegelman methods, used for estimating the absorption rate constant (ka) for drugs administered via non-intravenous routes. The Wagner-Nelson method relates ka to the plasma concentration derived from the slope of a semilog percent unabsorbed time plot. However, it is limited to drugs with one-compartment kinetics and can be impacted by factors like gastrointestinal motility or enzymatic degradation.
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One-Compartment Open Model for IV Bolus Administration: Estimation of Clearance00:56

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Clearance is a key pharmacokinetic parameter that quantifies the volume of body fluid from which a drug is entirely removed within a specific time frame. It is crucial in assessing how a drug is eliminated from the body and has critical clinical applications.
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Related Experiment Video

Updated: Feb 26, 2026

Ex Vivo Intestinal Sacs to Assess Mucosal Permeability in Models of Gastrointestinal Disease
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Estimating Human Jejunal Effective Permeability Using Numerical Deconvolution of Oral Solution Concentration Data.

Wenqian Zhang1, Jia Geng1, Xingrui He1

  • 1Division of Biopharmaceutics and Pharmacokinetics, Xiangya School of Pharmaceutical Sciences, Central South University, Tongzipo Road 172, Changsha, 410013, China.

Pharmaceutical Research
|February 24, 2026
PubMed
Summary

A new numerical deconvolution method accurately estimates jejunal permeability from oral and IV drug data. This approach accounts for first-pass metabolism, simplifying permeability assessment without complex perfusion studies.

Keywords:
absorptionfirst-pass metabolismhuman intestinal effective permeabilitynumerical deconvolutionoral solution

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Area of Science:

  • Pharmacokinetics and Drug Metabolism
  • Gastrointestinal Physiology
  • Computational Modeling in Pharmacology

Background:

  • Accurate human intestinal effective permeability (Peff) determination is crucial for drug development.
  • Traditional human intestinal perfusion experiments are complex and challenging.
  • Non-invasive methods are needed to estimate jejunal permeability.

Purpose of the Study:

  • To develop and validate a numerical deconvolution method for estimating jejunal permeability.
  • To utilize concentration-time data from oral solution and intravenous administration.
  • To assess the impact of first-pass metabolism on permeability estimates.

Main Methods:

  • Included 27 diverse drugs (acidic, basic, amphophilic, neutral).
  • Applied numerical deconvolution to oral and IV data across five time windows.
  • Calculated uncorrected (Peff, uncorr) and first-pass metabolism-corrected (Peff, FP_corr) permeability.
  • Compared estimates with observed human perfusion data (Peff, obs) and existing models.

Main Results:

  • The 0.25-0.75 h time window showed the best agreement with observed permeability.
  • Peff, FP_corr demonstrated a strong correlation with Peff, obs (R²=0.83).
  • The proposed method outperformed the three-parameter average model and was comparable to site-specific deconvolution.

Conclusions:

  • An oral solution-based numerical deconvolution method accurately estimates jejunal permeability.
  • Accounting for first-pass metabolism is key for reliable permeability predictions.
  • This method offers a simpler alternative to invasive perfusion studies.