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Drug Absorption: Factors Affecting GI Absorption

Drug Absorption: Factors Affecting GI Absorption

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.

Glucose Absorption Into the Small Intestine

Glucose Absorption Into the Small Intestine

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...

Factors Influencing Drug Absorption: Anatomical Parameters

Factors Influencing Drug Absorption: Anatomical Parameters

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...

Absorption of Nutrients

Absorption of Nutrients

Absorption refers to taking dietary nutrients from the intestinal lumen for transportation throughout the body. After digestion in the small intestine, carbohydrates, proteins, and fats are broken down into simpler forms. These essential macronutrients and other vital substances, such as vitamins, minerals, and water, are then prepared for absorption into the bloodstream.
Enterocytes, which are specialized polar epithelial cells, line the mucosa of the small intestinal walls. These cells...

Methods for Studying Drug Absorption: In vitro

Methods for Studying Drug Absorption: In vitro

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...

Drug Absorption: Overview

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The process of drug absorption signifies the transition of a drug from its site of administration into the plasma. This process is influenced by various factors, including the route of administration, the anatomy of the absorption site, the mechanism of absorption, gut motility, and the drug's physicochemical properties.
When drugs are injected intravenously, they directly enter the systemic circulation. Alternatively, orally administered drugs navigate through the gastrointestinal (GI)...

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Extraction and Purification of Polyphenols from Freeze-dried Berry Powder for the Treatment of Vascular Smooth Muscle Cells In Vitro

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Current Knowledge on Intestinal Absorption of Anthocyanins.

Tae Hun Hahm¹, Mitsuru Tanaka¹, Toshiro Matsui¹

¹Department of Bioscience and Biotechnology, Faculty of Agriculture, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.

Journal of Agricultural and Food Chemistry

|February 18, 2022

Summary

Anthocyanins, natural plant pigments, show promise as functional foods. Further research is needed to fully understand their complex absorption and bioavailability in the human body.

Keywords:

anthocyanins intestinal absorption metabolism transport pathways visualization

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Area of Science:

Biochemistry
Nutritional Science
Food Science

Background:

Anthocyanins are natural flavonoid pigments found in colorful fruits and vegetables.
They are recognized for potential physiological benefits and as functional food ingredients.
Limited data exists on the bioavailability and intestinal absorption mechanisms of diverse anthocyanin structures.

Purpose of the Study:

To review current knowledge on anthocyanin bioavailability.
To identify challenges and knowledge gaps in understanding anthocyanin absorption.
To discuss advanced analytical techniques for future research.

Main Methods:

Literature review of existing studies on anthocyanin bioavailability.
Discussion of physiological effects and chemical structures of anthocyanins.
Exploration of advanced imaging techniques like MALDI-MS imaging for in situ analysis.

Main Results:

Anthocyanins are promising functional food ingredients due to their physiological effects.
Significant gaps remain in understanding the intestinal absorption and transport of various anthocyanin forms.
Advanced techniques offer new possibilities for studying anthocyanin fate in vivo.

Conclusions:

Further investigation into anthocyanin bioavailability is crucial for functional food applications.
Elucidating absorption pathways requires advanced analytical methodologies.
Future research should focus on in situ studies to understand anthocyanin transport and metabolism.