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Related Concept Videos

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Capsule endoscopy, or wireless or video capsule endoscopy, is a diagnostic procedure for examining the entire gastrointestinal tract. Patients swallow a capsule about the size of a vitamin tablet. The capsule is equipped with a transmitter, a battery, an LED light source, and a color video camera to capture images throughout the gastrointestinal tract. This procedure is particularly useful for diagnosing conditions such as Crohn's disease, ulcerative colitis, tumors, polyps, ulcers,...
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This lesson explores three gastrointestinal imaging techniques: radionuclide testing, colonic transit studies, and virtual colonoscopy.
Radionuclide Testing
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Related Experiment Video

Updated: Aug 27, 2025

An Intestinal Gut Organ Culture System for Analyzing Host-Microbiota Interactions
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Smart capsule for targeted proximal colon microbiome sampling.

Sina Nejati1, Jiangshan Wang2, Sotoudeh Sedaghat1

  • 1School of Materials Engineering, Purdue University, West Lafayette, IN 47907, United States; Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907, United States.

Acta Biomaterialia
|September 26, 2022
PubMed
Summary
This summary is machine-generated.

A novel smart capsule enables targeted sampling of the proximal colon microbiome, offering a non-invasive method to study gut bacteria crucial for health and disease. This technology advances understanding of diet-microbiome interactions and digestive diseases.

Keywords:
ColonGastrointestinalMicrobiomeSampling CapsulepH-responsive polymers

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Area of Science:

  • Microbiology
  • Gastroenterology
  • Biomedical Engineering

Background:

  • The gut microbiome is vital for host health, influencing metabolism, immunity, and disease development.
  • Alterations in colonic microbiota are linked to obesity, IBD, and colorectal cancer.
  • Current methods for microbiome analysis lack spatial resolution or are invasive.

Purpose of the Study:

  • To develop an electronic-free smart capsule for site-specific sampling of the proximal colon microbiome.
  • To overcome limitations of fecal and endoscopic sampling techniques.
  • To enable precise analysis of gut microbiota in relation to diet and disease.

Main Methods:

  • A 3D-printed capsule utilizing a superabsorbent hydrogel and pH-sensitive enteric coating for targeted proximal colon fluid and microbiome collection.
  • Systematic dissolution characterization to optimize the pH-responsive coating.
  • Validation using in vitro GI tract models and in vivo animal studies (pigs).
  • Microbiome analysis via 16s rRNA and WideSeq sequencing.

Main Results:

  • The smart capsule successfully performed targeted sampling in the proximal colon.
  • Microbiome analysis confirmed that samples closely matched the bacterial population of the targeted region.
  • Optimized pH-sensitive coating ensured delayed capsule opening until the proximal colon.

Conclusions:

  • The developed smart capsule provides a non-invasive, site-specific method for colonic microbiome sampling.
  • This technology facilitates research into diet-host-microbiome relationships and digestive diseases.
  • It offers a valuable tool for gastroenterological research and clinical applications.