Intestinal Absorption
Intestinal Absorption - Related Videos
01:26
Glucose Absorption Into the Small Intestine
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2025
Complex carbohydrates consumed cannot be absorbed into the small intestine in their original form. First, they must be hydrolyzed to a monosaccharide form such as glucose or galactose. These monosaccharides are then transported across the intestinal membrane and into the blood via transcellular transport. The intestinal epithelial cells allow the movement of these monosaccharides with a defined 'entry' through membrane transporter proteins present on their apical membrane and 'exit' via the...
02:13
Adult Zebrafish Intestine Dissection: A Technique to Analyze Compound Absorption
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2023
This video describes the technique of isolating the intestine to evaluate the intestinal uptake of bioactive compounds. In this sample, we will isolate the intestine from an adult zebrafish to analyze the uptake of immunostimulants.
10:58
A Protocol for Lentiviral Transduction and Downstream Analysis of Intestinal Organoids
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Cited by 81 •
2015
In this video protocol we give a step by step explanation of lentiviral transduction in organoids of primary intestinal epithelium and of processing and downstream analysis of these cultures by quantitative RT-PCR, RNA-microarray and immunohistochemistry.
01:19
Drug Absorption: Factors Affecting GI Absorption
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2023
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. In...
17:15
Catheterization of Intestinal Loops in Ruminants
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Cited by 4 •
2009
We describe a novel surgical method for catheterizing 'intestinal loops' within the ileum of sheep. Once animals have recovered from surgery and have cleared antibiotics and analgesics, multiple treatments can be deposited directly in loops via the catheters.
FAQs
pH and solubility influence how much drug remains available in the intestinal lumen for transfer across the epithelium. A change in pH can alter the conditions under which a compound dissolves, while limited solubility can restrict the amount available even when epithelial transfer is favorable. These variables therefore affect both the rate and extent of absorption and can guide formulation decisions.
These routes describe different ways material can cross or pass through the intestinal epithelium. Passive diffusion and paracellular movement represent distinct paths, while transporter-mediated uptake and efflux can influence transfer in opposing directions. Considering all three mechanisms helps researchers interpret permeability findings and understand why net intestinal movement reflects more than one process.
These variables can change how quickly and how extensively a drug crosses the intestinal epithelium. Surface area, motility, and formulation each influence the conditions surrounding transfer, so absorption cannot be interpreted from epithelial permeability alone. Considering them together helps researchers evaluate why an apparently permeable compound may still show different absorption behavior under different gastrointestinal conditions.
In pharmacology, intestinal absorption helps determine oral bioavailability and therefore contributes to systemic exposure after dosing. If transfer is limited or variable, researchers must consider its potential effect on dosing requirements and the likelihood of reaching effective concentrations. This connection makes absorption a central consideration when interpreting the expected performance of an orally administered drug.
Intestinal absorption studies can evaluate permeability and examine how conditions affect transfer across the epithelium. Researchers also use the findings to optimize formulations and anticipate whether an orally administered drug will reach effective concentrations. These outcomes provide a bridge between mechanistic observations and practical pharmacology, especially when selecting or refining an oral formulation.
Because absorption influences systemic exposure, it is relevant when researchers anticipate drug interactions and differences among patients. Variations in pH, solubility, surface area, motility, or formulation can alter the rate or extent of transfer, which may contribute to different pharmacological outcomes. Assessing these variables helps place patient-to-patient variability and dosing requirements in an absorption context.