Oral Absorption Penetration
Oral Absorption Penetration - Related Videos
01:15
Non-Oral Extravascular Drug Absorption Routes
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2024
Non-oral extravascular routes, which encompass sublingual, buccal, topical, intramuscular, and inhalation methods, primarily utilize passive diffusion to transport drugs into the systemic circulation. The absorption rates and effectiveness of these routes depend on the drug's physicochemical properties, as well as the patient's anatomical and pathophysiological state. Lipophilic drugs that are stable at salivary pH (6) and exhibit minimal binding to the oral mucosa are absorbed more effectively...
10:12
Construction of Cyclic Cell-Penetrating Peptides for Enhanced Penetration of Biological Barriers
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Cited by 5 •
2022
This protocol describes the synthesis of cyclic cell-penetrating peptides with aromatic cross-links and the evaluation of their permeability across biological barriers.
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...
03:25
Oral Infection of Drosophila melanogaster with Pathogenic Bacteria
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2026
Source: Siva-Jothy, J. A., et al. Oral Bacterial Infection and Shedding in Drosophila melanogaster. J. Vis. Exp. (2018)The video demonstrates the oral infection of Drosophila melanogaster with pathogenic bacteria. It includes the preparation of infection vials and the transfer of starved flies to enable bacterial ingestion. The procedure captures gut colonization, followed by surface sterilization and homogenization of flies. Finally, it shows quantification of internal bacterial load through...
08:39
Shifting Zebrafish Lethal Skeletal Mutant Penetrance by Progeny Testing
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Cited by 8 •
2017
The goal of this protocol is to alter the penetrance of lethal skeletal mutant phenotypes in zebrafish by selective breeding. Lethal mutants cannot be grown to adulthood and bred themselves, therefore this protocol describes a method for tracking and selecting penetrance through multiple generations by progeny testing.
FAQs
Passive diffusion allows drug molecules to cross intestinal epithelial cells without carrier assistance, whereas transporter-mediated uptake depends on cellular proteins that facilitate entry. These routes can produce different absorption behavior because they respond differently to molecular properties and intestinal conditions. Distinguishing between them helps explain why chemically similar drugs may enter the bloodstream at different rates or efficiencies.
A drug must dissolve sufficiently before it can cross the intestinal lining, making solubility a prerequisite for effective uptake. Lipophilicity influences how readily molecules interact with cell membranes, while gastrointestinal pH can alter drug behavior in the intestinal environment. Together, these properties help determine whether an administered dose can reach the epithelial barrier in an absorbable form.
Intestinal motility influences how long a drug remains in contact with the gastrointestinal lining and how it is distributed through the intestinal tract. Changes in movement can therefore modify the opportunity for epithelial crossing, even when the drug's chemical properties remain unchanged. This variable contributes to differences in the amount of dose that ultimately becomes systemically available.
Drug loss can occur both before and after molecules reach the general circulation. Enzymes in the intestinal environment may alter some drug molecules during absorption, while hepatic first-pass metabolism can further reduce the fraction that survives passage through the liver. Accounting for these processes is essential when estimating systemic availability and interpreting the strength of an oral pharmacological effect.
Formulation affects how a drug is presented to the gastrointestinal environment and can influence properties such as solubility and the timing of drug exposure to the intestinal lining. Researchers use formulation optimization to address barriers to absorption and produce more reliable systemic availability. The goal is to make the administered dose more consistently capable of supporting the intended pharmacological response.
Evaluation considers the drug's ability to reach the intestinal epithelium, cross it through passive or transporter-mediated routes, and remain available after intestinal and hepatic losses. Researchers interpret these factors together with solubility, lipophilicity, gastrointestinal pH, formulation, and motility. This integrated assessment supports predictions of bioavailability and helps explain variation in treatment response.