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Extraction: Advanced Methods

Extraction: Advanced Methods

Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...

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Developing a novel antibacterial copper tetraamine fluoride.

Veena Wenqing Xu¹, Iris Xiaoxue Yin¹, John Yun Niu¹

¹Faculty of Dentistry, University of Hong Kong, Hong Kong, China.

Journal of Dentistry

|August 30, 2024

Summary

A novel copper tetraamine fluoride (CTF) solution was developed, demonstrating biocompatibility and significant antibacterial properties. This non-discolouring agent shows promise as an affordable anti-caries treatment for dental applications.

Keywords:

Antibacterial Caries Copper Dentine Fluoride

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Area of Science:

Biomaterials Science
Dental Research
Nanotechnology

Background:

Dental caries remains a significant global health issue.
Current treatments like silver diamine fluoride (SDF) can cause tooth discoloration.
There is a need for effective, biocompatible, and aesthetically pleasing anti-caries agents.

Purpose of the Study:

To synthesize and characterize a novel copper tetraamine fluoride (CTF) solution.
To evaluate the biocompatibility, antibacterial efficacy, and discolouring potential of CTF.
To compare CTF with silver diamine fluoride (SDF) as a potential anti-caries agent.

Main Methods:

CTF solution was synthesized using copper fluoride and ammonia.
Characterization included X-ray photoelectron spectroscopy (XPS).
Cytotoxicity was assessed using stem cells from human exfoliated deciduous teeth (SHED) and human gingival fibroblasts (HGF-1).
Antimicrobial activity was tested against Streptococcus mutans using colony-forming units (CFUs) and confocal laser scanning microscopy (CLSM).
Discolouring effects on dentine were evaluated using spectrophotometry.

Main Results:

XPS confirmed the synthesis of CTF.
CTF exhibited low cytotoxicity to SHED and HGF-1 cells.
CTF demonstrated significant antibacterial activity against Streptococcus mutans, comparable to SDF.
Spectrophotometry revealed minimal discolouration of dentine by CTF compared to SDF.
The developed CTF solution is alkaline (pH 9) with a high fluoride concentration (121,000 ppm).

Conclusions:

A biocompatible, alkaline CTF solution with potent antibacterial and non-discolouring properties was successfully developed.
CTF presents a promising, affordable alternative to SDF for preventing dental caries.
Further clinical translation could provide a valuable tool for dental professionals in caries management.