RESUMO
OBJECTIVE: To evaluate total absorbance, planktonic growth, biofilm formation, viability, metabolic activity, and pH of Streptococcus mutans UA159 cultures when different dilutions of Stevia rebaudiana Bertoni were applied and to determine the minimum inhibitory concentration (MIC) and the minimum biofilm inhibitory concentration (MBIC) of Stevia on S. mutans. MATERIALS AND METHODS: The effects of different dilutions of Stevia (0-400 mg/ml) on S. mutans total growth, planktonic growth, biofilm formation, viability, metabolic activity, and pH during a 72-h growth period were evaluated in this in vitro study. A stock solution was prepared by mixing 10 ml of tryptic soy broth (TSB) supplemented with 1% sucrose (TSBS) and 4 g of Stevia. RESULTS: S. mutans total growth and biofilm formation decreased with reduced concentrations of Stevia. Furthermore, the MIC was 25 mg/ml and the MBIC was 6.25 mg/ml. Complete eradication of S. mutans was not observed with any of the Stevia concentrations. Planktonic growth of S. mutans was not repressed by high concentrations of Stevia and most of the Stevia concentrations generated an increased pH. CONCLUSION: Because Stevia reduces biofilm and acid production, Stevia can be considered a non-cariogenic sweetener. CLINICAL RELEVANCE: This study confirms the anticariogenic effect of Stevia, like it has been previously reported, but more studies on the most effective concentration are needed, and in the present study, the minimum inhibitory concentration (MIC) and the minimum biofilm inhibitory concentration (MBIC) was determined in the presence of sucrose. Additionally, this is the first study to evaluate the effect of Stevia on S. mutans metabolic activity.
Assuntos
Cárie Dentária , Stevia , Streptococcus mutans , Edulcorantes , Biofilmes , Cárie Dentária/prevenção & controle , Testes de Sensibilidade Microbiana , Streptococcus mutans/crescimento & desenvolvimento , Sacarose/farmacologia , Edulcorantes/farmacologiaRESUMO
O objetivo da pesquisa foi comparar os efeitos de edulcorantes naturais utilizados como substrato por Streptococcus mutans e Lactobacillus acidophilus, verificando a capacidade desses microrganismos em metabolizar os edulcorantes, favorecendo o crescimento e a produção de ácidos. Para tal estudo, realizou-se um total de 180 leituras para as variáveis crescimento e produção de ácido, e para o processamento dos dados usou-se o pacote estatístico SPSS. Dadas às condições da metodologia, foi possível concluir que a Stevia Rebaudiana Bertoni ofereceu melhores resultados na redução do crescimento bacteriano e na produção de ácidos do que o Sorbitol.
This paper aimed at comparing the effects of natural sweeteners used as a substrate for Streptococcus mutans and Lactobacillus acidophilus, in order to verify the ability of these microorganisms to metabolize sweeteners, promoting the growth and the production of acids. For this study, the variables "growth" and "acid production" were analyzed and the processing data was based on the SPSS statistical package. It was concluded that Stevia rebaudiana Bertoni offered better results in reducing bacterial growth and production of the Sorbitol acids.
Assuntos
Sorbitol , Stevia , Edulcorantes , CrescimentoRESUMO
El esfuerzo del científico Moisés Santiago Bertoni por sistematizar parte de la riqueza que tiene el Paraguay, se refleja en la Stevia rebaudiana Bertoni, (Ka'a He'ê), una planta que hace parte de la identidad como nación, pero que al mismo tiempo, luego de un siglo, sigue siendo promisoria como elemento fundamental para la implementación de un modelo de desarrollo sostenible en áreas rurales.
The effort of the scientific Moisés Santiago Bertoni to systematize part of the richness of Paraguay is reflected in the Stevia rebaudiana Bertoni, (Ka'a He'ê). This plant makes part of the identity of the nation but at the same time, after a century, is still promising as an essential element for the implementation of a sustainable development model in rural areas.