A protein fraction, rich in agglutinins, obtained from the red alga Hypnea musciformis by precipitation with ammonium sulfate (F 40 /7o) showed antifungal activity against the fungi Trichophyton rubrum and Colletotrichum lindemunthianum, with total inhibition of spore germination at concentrations of 500, 1000 and 2000 g/mL. At 2000 g/mL, the fraction showed a trend to inhibit the development of C. musae and Fusarium oxysporum, but the results were not statistically significant. The fraction was not able to inhibit the growth of the fungi E solani and Aspergillus niger at the tested doses. The presence of the glycoprotein fetuin, for which the agglutinin in the fraction has affinity, removed the antifungal action against C. lindemunthianum and T. rubrum. The mechanism of the action of the protein fraction upon spore germination appears to involve the agglutinin present in that fraction since the addition of fetuin abolished the antifungal activity.
O presente trabalho teve como objetivo analisar a atividade antimicrobiana de um produto composto por EDTA gel associado a peróxido de hidrogênio (Canal Plus®) sobre amostras clínicas de Candida albicans, utilizando o método de diluição em caldo. Foram incluídos no estudo isolados bucais e amostra padrão de Candida albicans (ATTC 18804). O Canal Plus foi diluído em caldo BHI em placas de microtitulação, obtendo-se as concentrações finais de 50% a 0,02%. O hipoclorito de sódio 2,5% foi utilizado como controle positivo. Após, foi adicionado suspensão padronizada de Candida albicans e as placas foram incubadas a 37º C por 24 horas. Foram determinadas diluição inibitória mínima (DIM) e diluição fungicida mínima (DIF). O Canal Plus® foi capaz de inibir todas as cepas clínicas a partir da diluição 0,75%. Considerando os resultados obtidos, os dados sugerem que o Canal Plus tem eficiente atividade antimicrobiana sobre cepas clínicas de Candida albicans.
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