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Related Concept Videos

Glucose Absorption Into the Small Intestine01:26

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 'exit' via the...
Carbohydrate Absorption01:25

Carbohydrate Absorption

Carbohydrates are essential macronutrients that serve as the body's primary energy source. Their digestion begins in the mouth, where salivary amylase partially breaks down complex carbohydrates such as starch into smaller oligosaccharides. This mechanical and enzymatic activity prepares carbohydrates for further processing in the gastrointestinal tract.
After being swallowed, the partially digested carbohydrates mix with gastric secretions in the stomach. However, the acidic environment...
Anatomy of Chloroplasts01:07

Anatomy of Chloroplasts

Green algae and plants, including green stems and unripe fruit, harbor chloroplasts—the vital organelles where photosynthesis takes place. In plants, the highest density of chloroplasts is found in the mesophyll cells of leaves.
Transcellular Transport of Solutes01:23

Transcellular Transport of Solutes

Transcellular transport of solutes is the movement of substances like monosaccharides and amino acids through polarized cells. This transport mechanism is primarily seen in epithelial and endothelial cells aided by membrane transport proteins such as channels and transporters. The tight junctions between these cells confine the membrane proteins to the two sides of the cell. The epithelial cells have distinct apical and basolateral domains. In contrast, the endothelial cells show the luminal...
The Anatomy of Chloroplasts01:08

The Anatomy of Chloroplasts

Green algae and plants, including green stems and unripe fruit, harbor specialized organelles called chloroplasts to carry out photosynthesis. They coordinate both stages of photosynthesis — the light-dependent reactions and the light-independent reactions. The light-dependent reactions use sunlight to release oxygen and produce chemical energy in the form of ATP and NADPH, and the light-independent reactions capture CO2 and use ATP and NADPH to produce sugar.
Structure of Chloroplasts
A...
Oral Hypoglycemic Agents: α-Glucosidase Inhibitors01:19

Oral Hypoglycemic Agents: α-Glucosidase Inhibitors

α-glucosidase inhibitors, including acarbose (Precose), miglitol (Glyset), and voglibose (Voglib) (primarily available in Asia), are drugs that control blood sugar levels by delaying the digestion of starch and disaccharides. They achieve this by inhibiting α-glucosidase enzymes in the intestine, which slow the absorption of carbohydrates in the intestine, which in turn leads to a prolonged release of the glucoregulatory hormone GLP-1 from intestinal L-cells.
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Related Experiment Video

Updated: May 31, 2026

Isolation of Physiologically Active Thylakoids and Their Use in Energy-Dependent Protein Transport Assays
12:25

Isolation of Physiologically Active Thylakoids and Their Use in Energy-Dependent Protein Transport Assays

Published on: September 28, 2018

Chloroplast thylakoids reduce glucose uptake and decrease intestinal macromolecular permeability.

Caroline Montelius1, Karolina Gustafsson, Björn Weström

  • 1Department of Experimental Medical Science, Appetite Control Unit, BMC B11, Lund University, Lund, Sweden.

The British Journal of Nutrition
|July 9, 2011
PubMed
Summary

Thylakoid membranes from chloroplasts slow the passage of molecules through the rat intestine. This dose-dependent effect, likely due to steric hindrance, suggests potential for controlling glucose absorption and enhancing intestinal barrier function.

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Analysis of Protein Import into Chloroplasts Isolated from Stressed Plants
10:18

Analysis of Protein Import into Chloroplasts Isolated from Stressed Plants

Published on: November 1, 2016

Related Experiment Videos

Last Updated: May 31, 2026

Isolation of Physiologically Active Thylakoids and Their Use in Energy-Dependent Protein Transport Assays
12:25

Isolation of Physiologically Active Thylakoids and Their Use in Energy-Dependent Protein Transport Assays

Published on: September 28, 2018

Analysis of Protein Import into Chloroplasts Isolated from Stressed Plants
10:18

Analysis of Protein Import into Chloroplasts Isolated from Stressed Plants

Published on: November 1, 2016

Area of Science:

  • Plant biochemistry
  • Gastrointestinal physiology

Background:

  • Thylakoid membranes, originating from chloroplasts, are known to impact fat digestion and blood glucose levels.
  • Previous research indicates a physiological effect of thylakoids on nutrient absorption.

Purpose of the Study:

  • To investigate the effect of thylakoid membranes on the intestinal passage of specific molecules in an in vitro model.
  • To determine the mechanism by which thylakoids influence nutrient transport across the intestinal barrier.

Main Methods:

  • Utilized an in vitro Ussing chamber model with rat intestinal tissue.
  • Assessed the passage of methyl-glucose, dextran, and ovalbumin in the presence of varying concentrations of thylakoid membranes.

Main Results:

  • Thylakoid membranes demonstrated a dose-dependent retardation of methyl-glucose, dextran, and ovalbumin passage.
  • Evidence suggests thylakoids adhere to the mucosal surface, potentially causing steric hindrance.
  • The observed delay in molecular transit is attributed to a physical barrier effect.

Conclusions:

  • Thylakoid membranes significantly impede the passage of various molecules across the intestinal lining.
  • The findings suggest thylakoids could be utilized to modulate intestinal glucose absorption.
  • Thylakoid membranes show promise in enhancing the overall barrier function of the intestine.