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Published in: BMC Oral Health 1/2016

Open Access 01-12-2016 | Research article

Antibacterial effect of silver (I) carbohydrate complexes on oral pathogenic key species in vitro

Authors: Markus Reise, Michael Gottschaldt, Carina Matz, Andrea Völpel, Klaus D. Jandt, Ulrich S. Schubert, Bernd W. Sigusch

Published in: BMC Oral Health | Issue 1/2016

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Abstract

Background

It was the aim of this study to evaluate the antibacterial impact of two silver(I) carbohydrate complexes with tripodal thioglycosides, namely tris[2-(β-D-thio-glucopyranosyl)ethyl]-amine-silver(I)-nitrate (3) and tris[2-(α-D-thio-manno-pyranosyl)ethyl]-amine-silver(I)-nitrate (4), on five oral pathogenic bacterial strains. Furthermore, cytocompatibility was tested using human gingival fibroblasts (HGF).

Methods

Minimum inhibitory concentrations (MIC) were determined on five oral pathogenic bacterial strains by using the broth microdilution method: Fusobacterium nucleatum (ATCC 10953), Aggregatibacter actinomycetemcomitans (ATCC 33384), Porphyromonas gingivalis (ATCC 33277), Streptococcus mutans (ATCC 25175) and Enterococcus faecalis (DSMZ 20376). Furthermore, antimicrobial efficiency was tested using agar diffusion assays. To evaluate cytocompatibility, human gingival fibroblasts (HGFs) were exposed to AgNO3 and complex 3 followed by a live/dead staining.

Results

MIC of the silver(I) complexes ranged between 0.625 and 5.0 mmol/L. The silver complexes 3 and 4 showed higher antibacterial efficiency against all tested species than AgNO3. Antibacterial efficiency of complexes 3 and 4 on F. nucleatum (≥18 mm) and A. actinomycetemcomitans (≥23 mm) was more pronounced than against P. gingivalis (≥15 mm). Complex 3 (20 mM) induced the largest inhibition zones (30 to 31 mm) on Gram-negative strains. For Gram-positive strains, the largest inhibition zones were achieved by complex 3 (20 mM/S. mutans: 28 mm, E. faecalis: 18 mm). Complex 3 had a lower cytotoxic impact on HGFs compared to AgNO3 by the power of ten.

Conclusions

The findings suggest that silver(I) carbohydrate complexes 3 and 4 might function as novel antimicrobial agents for the treatment of periodontal, carious or endodontic diseases.
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Metadata
Title
Antibacterial effect of silver (I) carbohydrate complexes on oral pathogenic key species in vitro
Authors
Markus Reise
Michael Gottschaldt
Carina Matz
Andrea Völpel
Klaus D. Jandt
Ulrich S. Schubert
Bernd W. Sigusch
Publication date
01-12-2016
Publisher
BioMed Central
Published in
BMC Oral Health / Issue 1/2016
Electronic ISSN: 1472-6831
DOI
https://doi.org/10.1186/s12903-016-0201-4

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