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BMC Complementary Medicine and Therapies
Published in: BMC Complementary Medicine and Therapies 1/2018

Open Access 01-12-2018 | Research article

Effect of tt-farnesol and myricetin on in vitro biofilm formed by Streptococcus mutans and Candida albicans

Authors: Guilherme Roncari Rocha, Elkin Jahir Florez Salamanca, Ana Letícia de Barros, Carmélia Isabel Vitorino Lobo, Marlise Inêz Klein

Published in: BMC Complementary Medicine and Therapies | Issue 1/2018

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Abstract

Background

Dental caries is considered a multifactorial disease, in which microorganisms play an important role. The diet is decisive in the biofilm formation because it provides the necessary resources for cellular growth and exopolysaccharides synthesis. Exopolysaccharides are the main components of the extracellular matrix (ECM). The ECM provides a 3D structure, support for the microorganisms and form diffusion-limited environments (acidic niches) that cause demineralization of the dental enamel. Streptococcus mutans is the main producer of exopolysaccharides. Candida albicans is detected together with S. mutans in biofilms associated with severe caries lesions. Thus, this study aimed to determine the effect of tt-farnesol and myricetin topical treatments on cariogenic biofilms formed by Streptococcus mutans and Candida albicans.

Methods

In vitro dual-species biofilms were grown on saliva-coated hydroxyapatite discs, using tryptone-yeast extract broth with 1% sucrose (37 °C, 5% CO2). Twice-daily topical treatments were performed with: vehicle (ethanol 15%, negative control), 2 mM myricetin, 4 mM tt-farnesol, myricetin + tt-farnesol, myricetin + tt-farnesol + fluoride (250 ppm), fluoride, and chlorhexidine digluconate (0.12%; positive control). After 67 h, biofilms were evaluated to determine biofilm biomass, microbial population, and water-soluble and -insoluble exopolysaccharides in the ECM.

Results

Only the positive control yielded a reduced quantity of biomass and microbial population, while tt-farnesol treatment was the least efficient in reducing C. albicans population. The combination therapy myricetin + farnesol + fluoride significantly reduced water-soluble exopolysaccharides in the ECM (vs. negative control; p < 0.05; ANOVA one-way, followed by Tukey’s test), similarly to the positive control.

Conclusions

Therefore, the combination therapy negatively influenced an important virulence trait of cariogenic biofilms. However, the concentrations of both myricetin and tt-farnesol should be increased to produce a more pronounced effect to control these biofilms.
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Metadata
Title
Effect of tt-farnesol and myricetin on in vitro biofilm formed by Streptococcus mutans and Candida albicans
Authors
Guilherme Roncari Rocha
Elkin Jahir Florez Salamanca
Ana Letícia de Barros
Carmélia Isabel Vitorino Lobo
Marlise Inêz Klein
Publication date
01-12-2018
Publisher
BioMed Central
Published in
BMC Complementary Medicine and Therapies / Issue 1/2018
Electronic ISSN: 2662-7671
DOI
https://doi.org/10.1186/s12906-018-2132-x

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