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Related Concept Videos

Drug Absorption: Factors Affecting GI Absorption01:19

Drug Absorption: Factors Affecting GI Absorption

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The process of oral drug absorption can be influenced by several factors. Weakly acidic drugs tend to be absorbed more readily from the stomach due to their nonionized state. However, absorption may be less efficient in the upper intestine, where drugs are often ionized. Interestingly, despite the stomach's apparent advantage for drug absorption, its mucous layer can hinder diffusion. Its surface area is also smaller than the intestine's, which can further slow down the absorption rate.
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Factors Influencing Drug Absorption: Anatomical Parameters01:23

Factors Influencing Drug Absorption: Anatomical Parameters

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Drug absorption involves the movement of drugs from the point of administration into the systemic circulation. Initially, Gastrointestinal (GI) motility propels the drug through the digestive tract and into the stomach. However, the stomach's high acidity and limited surface area restrict its role in drug absorption for most drugs. The drug then moves from the stomach to the small intestine via gastric emptying, which can be slowed by various factors, including interactions with other...
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Factors Influencing Drug Absorption: Disease States and Pharmacology01:25

Factors Influencing Drug Absorption: Disease States and Pharmacology

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Multiple disease states can significantly influence the oral drug absorption process by affecting blood flow and the functionality of the gastrointestinal (GI) system. Various GI diseases, including conditions that alter GI motility, such as diarrhea, decreased acid secretions (achlorhydria), and infections, have been associated with reduced drug absorption.
Substances such as alcohol and specific drugs, including antineoplastics, can also negatively impact drug absorption. For instance,...
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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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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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Related Experiment Video

Updated: May 6, 2026

An In Vivo Method for Evaluating the Gut-Blood Barrier and Liver Metabolism of Microbiota Products
14:54

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Guaran effect on rat intestinal absorption. A perfusion study.

B Elsenhans, D Zenker, W F Caspary

    Gastroenterology
    |April 1, 1984
    PubMed
    Summary

    Soluble dietary fibers like guaran can hinder nutrient absorption by increasing intestinal viscosity, especially at low flow rates. This effect is reversible and suggests a general mechanism impacting nutrient uptake.

    Area of Science:

    • Gastroenterology
    • Nutritional Science
    • Pharmacology

    Background:

    • Soluble polysaccharides in dietary fiber, such as guaran and pectin, are known to affect intestinal absorption.
    • The precise mechanism by which these compounds impair absorption remains largely unknown.

    Purpose of the Study:

    • To investigate the direct impact of guaran on small intestinal absorption.
    • To elucidate the mechanism behind the inhibitory effects of soluble, viscosity-enhancing polysaccharides on nutrient absorption.

    Main Methods:

    • A single-pass perfusion technique was employed to evaluate guaran's effect on intestinal absorption in situ.
    • Absorption of actively transported and passively permeating solutes was measured at varying guaran concentrations and perfusion rates.
    • The influence of pectin and carrageenan at comparable viscosities was also assessed.

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    Main Results:

    • Guaran inhibited the absorption of actively transported (alpha-methyl-D-glucoside, cycloleucine, taurocholate) and passively absorbed (2-deoxy-D-glucose, urea) compounds.
    • Inhibition was viscosity-dependent and observed primarily at low perfusion rates (<0.4-0.5 ml/min), with higher rates reversing the effect.
    • Guaran altered water absorption, causing secretion, and increased the transport constant for glucose absorption without affecting maximal capacity.

    Conclusions:

    • Soluble, viscosity-enhancing polysaccharides like guaran, pectin, and carrageenan generally impair intestinal absorption through a mechanism likely involving increased unstirred water layer resistance.
    • This effect is dependent on perfusion rate, being more pronounced at lower rates.
    • The observed alterations in absorption are fully reversible upon removal of the polysaccharide.