Abstract
Turnera diffusa commonly called Damiana is a wild shrub traditionally used as aphrodisiac, diuretic, and for cancer and diabetes treatments. Its extracts are rich in flavonoid, phenolic, and terpenoid compounds that have been reported as potential reductors for metal ions. In this sense, this study reports a novel and facile method for green gold nanoparticle (AuNPs) synthesis using T. diffusa extracts. The water-soluble organic compounds were obtained by hydrothermal route and the AuNPs@Damiana samples were fully characterized. The results indicated high efficiency of T. diffusa extracts to reduce and stabilize the AuNPs which showed spherical shape, 24 nm diameter, negative surface charge, and high colloidal stability at biological pH and alkaline media. Additionally, its antimicrobial activity was evaluated against Salmonella Enteritidis, Escherichia coli ATCC 8739, and Listeria monocytogenes, showing an enhanced microbial inhibition on Gram-negative bacteria.
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