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Synergistic effect of methylene blue and biogenic gold nanoparticles against Enterococcus faecalis.

Abstract：

:This study reports successful photodynamic inactivation of planktonic and biofilm cells of Enterococcus faecalis using Methylene Blue (MB) in combination with gold nanoparticles synthesized using the cell-free filtrate obtained from 3-day biomass of Trichoderma asperellum strain. Monodispersed colloidal gold nanoparticles were characterized by UV-vis absorption, TEM and DLS to be 13 ± 3 nm spheres. Diode lasers with the peak-power wavelength ʎ = 660 nm (output power of 21, 41 and 68 mW; power density of 55, 108 and 179 mW∙cm-2, respectively, were used as a light source to study the effects of MB alone, the gold nanoparticles alone (AuNPs) and the MB + AuNPs mixture on the viability of E. faecalis cells. The lethal effect of planktonic cells was achieved for MB after 30 min of laser irradiation with energy fluence of 322 J∙cm-2. When MB + AuNPs mixture was used as photosensitizer, the lethal effect was achieved with energy fluence of 292 J∙cm-2. The biofilm culture was more resistant to photo-inactivation and the best bactericidal effect of MB as photosensitizer was found after light dose of 483 J∙cm-2. The bacterial cell viability was reduced by 99.92%. It was proved that MB + AuNPs mixture synergistically enhances the kill of the studied microorganism as the same light dose resulted in 99.991% kill.

journal_name

Photodiagnosis Photodyn Ther

journal_title

Photodiagnosis and photodynamic therapy

authors

Maliszewska I,Wróbel J,Wanarska E,Podhorodecki A,Matczyszyn K

doi

10.1016/j.pdpdt.2019.05.042

subject

Has Abstract

pub_date

2019-09-01 00:00:00

pages

218-226

eissn

1572-1000

issn

1873-1597

pii

S1572-1000(19)30022-5

journal_volume

27

pub_type

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