Nos últimos anos, as nanopartículas de prata (AgNPs) têm atraído muita atenção devido às suas largas aplicações em diferentes campos como biotecnologia, microeletrônica, armazenamento de informação óptica, medicina e conversão de energia. O presente trabalho teve como objetivo sintetizar nanopartículas de prata a partir de amostras de mel de abelhas Apis mellifera produzidos na cidade de Santarém-Pará, Brasil. Além disso, avaliar a atividade antimicrobiana dessas amostras, obtidas em dois períodos distintos (seco e chuvoso), frente a patógenos de interesse clínico: Staphylococcus aureus, Staphylococus epidermidis e Cândida krusei. Todas as amostras apresentaram estabilidade, homogeinidade e diâmetro hidrodinâmico médio de 600 nm, tendo uma grande área superficial. Apresentaram índice de polidispersividade (PdI) médio de 0,36 e 0,28, utilizando méis do período seco e chuvoso, respectivamente. O potencial Zeta foi negativo para 5 amostras do período seco. As linhagens de S. aureus, S. epidermides e C. krusei foram sensíveis à todas as AgNPs sintetizadas, sendo que as CMI para S. aureus e S. epidermides variaram de 0,17 a 10,79 mg mL-1 e para C. krusei de 0,08 a 10,79 mg mL-1. De acordo com estudos as AgNPs sintetizadas se mostram mais ativas em bactérias Gram negativas do que Gram positivo. No entanto, os elevados valores de CMI obtidos neste trabalho estão associados aos maiores tamanhos das nanoparticulas sintetizadas. Palavras-chave: Apis melífera. Staphylococcus aureus. Staphylococus epidermidis. Candida krusei. Abstract In recent years, silver nanoparticles (AgNPs) have attracted a lot of attention due to their wide applications in different fields such as biotechnology, microelectronics, optical information storage, medicine, and energy conversion. The present work aimed to synthesize silver nanoparticles from honey samples from Apis mellifera bees produced in the Santarém-Pará, Brazil. In addition, to evaluate the antimicrobial activity of these samples, obtained in two distinct periods (dry and rainy), against pathogens of clinical interest: Staphylococcus aureus, Staphylococus epidermidis and Candida krusei. All samples showed stability, homogeneity and an average hydrodynamic diameter of 600 nm, with a large surface area. They had an average polydispersity index (PdI) of 0.36 and 0.28, using honeys from the dry and rainy periods, respectively. The Zeta potential was negative for 5 samples from the dry period. The strains of S. aureus, S. epidermides and C. krusei were sensitive to all synthesized AgNPs, with the MIC for S. aureus and S. epidermides ranging from 0.17 to 10.79 mg mL-1 and for C krusei from 0.08 to 10.79 mg mL-1. According to studies, the synthesized AgNPs are more active in Gram negative bacteria than Gram positive. However, the high MIC values obtained in this work are associated with the larger sizes of the synthesized nanoparticles. Keywords: Apis mellifera. Staphylococcus aureus. Staphylococus epidermidis. Candida krusei.
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