Antitumour, antimicrobial and catalytic activity of gold nanoparticles synthesized by different pH propolis extracts

Springer Science and Business Media LLC - Tập 17 - Trang 1-13 - 2015
Florentina Gatea1, Eugenia Dumitra Teodor1, Ana-Maria Seciu2, Ovidiu Ilie Covaci3, Sorin Mănoiu2, Veronica Lazăr4, Gabriel Lucian Radu5
1Centre of Bioanalysis, National Institute for Biological Sciences, Bucharest, Romania
2Cellular and Molecular Biology Department, National Institute for Biological Sciences, Bucharest, Romania
3SARA Pharm Solutions, Bucharest, Romania
4Faculty of Biology, University of Bucharest, Bucharest, Romania
5Faculty of Applied Chemistry and Materials Science, University POLITEHNICA Bucharest, Bucharest, Romania

Tóm tắt

The Romanian propolis was extracted in five different media, respectively, in water (pH 6.8), glycine buffer (pH 2.5), acetate buffer (pH 5), phosphate buffer (pH 7.4) and carbonate buffer (pH 9.2). The extracts presented different amounts of flavonoids and phenolic acids, increasing pH leading to higher concentrations of active compounds. Five variants of gold nanoparticles suspensions based on different pH Romanian propolis aqueous extracts were successfully synthesized. The obtained nanoparticles presented dimensions between 20 and 60 nm in dispersion form and around 18 nm in dried form, and different morphologies (spherical, hexagonal, triangular). Fourier transform infrared spectroscopy proved the attachment of organic compounds from propolis extracts to the colloidal gold suspensions and X-ray diffraction certified that the suspensions contain metallic gold. The obtained propolis gold nanoparticles do not exhibit any antibacterial or antifungal activity, but presented different catalytic activities and toxicity on tumour cells.

Tài liệu tham khảo

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