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Related Concept Videos

Immunogold Electron Microscopy01:20

Immunogold Electron Microscopy

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Immunoelectron microscopy utilizes immunogold labeling of endogenous proteins with specific antibodies to detect and localize these proteins in cells and tissues. The procedure provides insights into the distribution and quantification of protein under different stimulation conditions offering clues about their functions. Conjugating highly electron-dense gold particles with primary or secondary antibodies allow antigen detection on and within cells, with high resolution and specificity.
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Capillary Beds01:20

Capillary Beds

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Capillary beds are networks of tiny blood vessels that play a crucial role in the circulatory system. These beds are where the exchange of gases, nutrients, and waste products occurs between the blood and surrounding tissues. Each capillary bed consists of numerous capillaries, which are the smallest blood vessels in the body, typically only one cell-thick. This thinness allows for the efficient diffusion of substances.
Capillaries connect arterioles, small branches of arteries, to venules,...
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Capillary Exchange01:28

Capillary Exchange

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The cardiovascular system's chief role is to disseminate gases, nutrients, waste, and other substances to the body's cells. Small molecules like gases, lipids, and lipid-soluble substances directly diffuse through capillary wall endothelial cell membranes. Glucose, amino acids, and ions, including sodium, potassium, calcium, and chloride, use transporters for facilitated diffusion via membrane-specific channels. Glucose, ions, and bigger molecules may also pass through intercellular...
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Surface Tension, Capillary Action, and Viscosity02:57

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Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
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Capillaries and Their Types01:20

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Capillaries, a crucial constituent of the circulatory system, are diminutive vessels with a diameter between 5–10 micrometers, accommodating perfusion to the tissues through the phenomenon known as microcirculation. Through their permeable walls, consisting of an endothelial layer ensconced by a basement membrane and sporadically dispersed smooth muscle fibers, the exchange of substances between the blood and the interstitial fluid becomes plausible. Variance in wall composition exists,...
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Capillary Electrophoresis: Instrumentation01:20

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Capillary electrophoresis instrumentation typically consists of several key components. A high-voltage power supply generates the electric field necessary for the separation by connecting to an anode (the positively charged electrode) and a cathode (the negatively charged electrode) located in buffer reservoirs at each end of the capillary tube. The system includes a sample vial, a fused silica capillary tube coated with polyimide for mechanical strength through which the sample components...
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Related Experiment Video

Updated: Feb 10, 2026

Capillary-based Centrifugal Microfluidic Device for Size-controllable Formation of Monodisperse Microdroplets
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A bead-based immunogold-silver staining assay on capillary-driven microfluidics.

Ngoc M Pham1, Sebastian Rusch2,3,4, Yuksel Temiz5

  • 1ETH Zürich, Mobile Health Systems Lab, Institute for Robotics and Intelligent Systems, Department of Health Sciences and Technology, BAA, Lengghalde 5, 8092, Zürich, Switzerland.

Biomedical Microdevices
|May 22, 2018
PubMed
Summary
This summary is machine-generated.

This study presents a novel point-of-care diagnostic method using microfluidic chips and silver staining for rapid infectious disease detection. The developed immunoassay demonstrates comparable performance to ELISA but with significantly reduced assay times and sample volumes.

Keywords:
ImmunoassaysMicrobeadsMicrofluidicsSilver staining

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Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Diagnostics

Background:

  • Point-of-care (POC) diagnostics are crucial for infectious disease detection, especially in remote areas.
  • Implementing immunoassays with signal amplification (e.g., silver staining) and antibody immobilization in POC devices presents significant challenges.
  • Current methods often require large sample volumes and lengthy assay times, limiting their utility in resource-limited settings.

Purpose of the Study:

  • To develop and validate strategies for immobilizing capture antibodies (cAbs) in microfluidic chips for POC diagnostics.
  • To implement a gold-catalyzed silver staining reaction for signal amplification within these microfluidic chips.
  • To demonstrate a flexible and efficient immunoassay for rapid analyte detection using minimal sample and reagent volumes.

Main Methods:

  • Fabrication of silicon microfluidic chips with engraved
  • bead lanes
  • for capillary-driven fluid flow.
  • Functionalization of fluorescent microbeads with capture antibodies (cAbs) and their assembly within the microfluidic chip.
  • Immunoassay protocol involving sample capture by cAbs, detection antibody (dAbs) binding conjugated to gold nanoparticles, and gold-catalyzed silver staining for signal generation.

Main Results:

  • Successful immobilization of cAbs and implementation of a gold-catalyzed silver staining reaction in microfluidic chips.
  • Demonstrated a species/anti-species immunoassay detecting rabbit IgG antibodies with a limit of detection of 24.6 ng/mL in 20 minutes.
  • Achieved assay performance comparable to traditional 96-well plate ELISA but with a ~7-fold reduction in assay time and minimal sample/reagent requirements (microliter range).

Conclusions:

  • The developed proof-of-concept method offers a flexible and efficient approach for POC immunoassays.
  • This strategy overcomes key challenges in antibody immobilization and signal amplification for microfluidic diagnostic devices.
  • The rapid, low-volume assay format holds significant promise for infectious disease diagnostics in resource-limited and remote settings.