Lasers in Medical Science

, Volume 27, Issue 6, pp 1205–1212 | Cite as

Photodynamic inactivation of biofilms formed by Candida spp., Trichosporon mucoides, and Kodamaea ohmeri by cationic nanoemulsion of zinc 2,9,16,23-tetrakis(phenylthio)-29H, 31H-phthalocyanine (ZnPc)

  • J. C. Junqueira
  • A. O. C. Jorge
  • J. O. Barbosa
  • R. D. Rossoni
  • S. F. G. Vilela
  • A. C. B. P. Costa
  • F. L. Primo
  • J. M. Gonçalves
  • A. C. Tedesco
  • J. M. A. H. Suleiman
Original Article


The biofilms formed by opportunistic yeasts serve as a persistent reservoir of infection and impair the treatment of fungal diseases. The aim of this study was to evaluate photodynamic inactivation (PDI) of biofilms formed by Candida spp. and the emerging pathogens Trichosporon mucoides and Kodamaea ohmeri by a cationic nanoemulsion of zinc 2,9,16,23-tetrakis(phenylthio)-29H,31H-phthalocyanine (ZnPc). Biofilms formed by yeasts after 48 h in the bottom of 96-well microtiter plates were treated with the photosensitizer (ZnPc) and a GaAlAs laser (26.3 J cm–2). The biofilm cells were scraped off the well wall, homogenized, and seeded onto Sabouraud dextrose agar plates that were then incubated at 37°C for 48 h. Efficient PDI of biofilms was verified by counting colony-forming units (CFU/ml), and the data were submitted to analysis of variance and the Tukey test (p < 0.05). All biofilms studied were susceptible to PDI with statistically significant differences. The strains of Candida genus were more resistant to PDI than emerging pathogens T. mucoides and K. ohmeri. A mean reduction of 0.45 log was achieved for Candida spp. biofilms, and a reduction of 0.85 and 0.84, were achieved for biofilms formed by T. mucoides and K. ohmeri, respectively. Therefore, PDI by treatment with nanostructured formulations cationic zinc 2,9,16,23- tetrakis (phenylthio)- 29H, 31H- phthalocyanine (ZnPc) and a laser reduced the number of cells in the biofilms formed by strains of C. albicans and non-Candida albicans as well the emerging pathogens T. mucoides and K. ohmeri.


Biofilm Candida spp. Trichosporon mucoides Kodamaea ohmeri Photodynamic inactivation Zinc phthalocyanine 



This study was supported by the São Paulo Council of Research - FAPESP, Brazil (Grant 09/52283-0), post-doc FAPESP project 2009/15363-6 (F.L.P.) and Univ Estadual Paulista - PROPE/UNESP.


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Copyright information

© Springer-Verlag London Ltd 2012

Authors and Affiliations

  • J. C. Junqueira
    • 1
  • A. O. C. Jorge
    • 1
  • J. O. Barbosa
    • 1
  • R. D. Rossoni
    • 1
  • S. F. G. Vilela
    • 1
  • A. C. B. P. Costa
    • 1
  • F. L. Primo
    • 2
  • J. M. Gonçalves
    • 2
  • A. C. Tedesco
    • 2
  • J. M. A. H. Suleiman
    • 3
  1. 1.Department of Biosciences and Oral Diagnosis, School of Dentistry of São José dos CamposUNESP- Univ Estadual PaulistaSão José dos CamposBrazil
  2. 2.Departamento de Química, Laboratório de Fotobiologia e Fotomedicina, Centro de Nanotecnologia e Engenharia Tecidual de Ribeirão Preto, Faculdade de Filosofia, Ciências e Letras de Ribeirão PretoUniversidade de São PauloRibeirão PretoBrazil
  3. 3.Emílio Ribas Institute of Infectious DiseasesSão PauloBrazil

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