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Related Concept Videos

EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

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Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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Special Staining Techniques01:13

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Specialized staining techniques play a vital role in microbiology by enabling the visualization of specific bacterial structures that remain undetectable with standard microscopy methods. These techniques not only enhance the structural visualization of bacterial cells but also provide critical insights into their pathogenicity and classification. Additionally, they support diagnostic and research endeavors in microbiology by identifying key bacterial features.Capsule Staining for Virulence...
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Masking and Demasking Agents01:19

Masking and Demasking Agents

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EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on...
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Related Experiment Video

Updated: Apr 1, 2026

The C-seal: A Biofragmentable Drain Protecting the Stapled Colorectal Anastomosis from Leakage
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Lethal bacterial trap: Cationic surface for endodontic sealing.

Dana Kesler Shvero1, Nathan Zaltsman1, Ervin I Weiss1

  • 1Department of Prosthodontics, Faculty of Dentistry, The Hebrew University-Hadassah, P.O. Box 12272, Jerusalem, 91120, Israel.

Journal of Biomedical Materials Research. Part A
|September 30, 2015
PubMed
Summary

New epoxy resin surfaces with cationic nanoparticles effectively attract and kill root canal pathogens like Enterococcus faecalis. This innovation offers a potent, long-lasting antibacterial solution for endodontic treatments.

Keywords:
Enterococcus faecalisantibacterialmembranenanoparticlesquaternary ammonium

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High-throughput Identification of Bacteria Repellent Polymers for Medical Devices
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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Microbiology

Background:

  • Insoluble antibacterial cationic nanoparticles exhibit potent and enduring antibacterial effects.
  • Root canal pathogens pose a significant challenge in endodontic treatments.
  • Epoxy resin-based sealers are commonly used in root canal therapy.

Purpose of the Study:

  • To evaluate an epoxy resin-based surface incorporating quaternary ammonium polyethyleneimine (QPEI) nanoparticles for antibacterial properties against root canal pathogens.
  • To test the hypothesis that these modified surfaces attract and eliminate root canal pathogens.

Main Methods:

  • Surface characterization using atomic force microscopy and X-ray photoelectron spectroscopy.
  • Evaluation of anti-Enterococcus faecalis effects in an anti-gravitational model.
  • Assessment of bacterial cell membrane potential, viability, biofilm thickness, and biomass via flow cytometry and confocal laser scanning microscopy.
  • Analysis of antibiofilm activity in bacterial supernatant.

Main Results:

  • Confirmed embedment of QPEI nanoparticles on the modified epoxy resin surface.
  • Demonstrated active attraction of bacteria to the QPEI-modified surface.
  • Observed membrane destabilization and bacterial death upon exposure.
  • Showcased antibacterial activity in the supernatant of pre-exposed bacteria.

Conclusions:

  • The epoxy resin-based surface incorporating QPEI nanoparticles effectively traps and eliminates bacteria.
  • The nanoparticles attract bacteria, reduce viability, and promote cell death, offering a promising antibacterial strategy.
  • This material demonstrates significant potential for enhancing the antibacterial efficacy of endodontic sealers.