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Previous illumination of a water soluble chlorine photosensitizer increases its cytotoxicity

  • Interaction of Laser Radiation with Matter
  • Published:
Laser Physics

Abstract

Photodithazine (PDZ) is an N-methyl-D-glucosamine derivative of chlorine e6 that is water soluble and has an intense absorption in the range of 650–680 nm. PDZ photobleaching and photoproduct formation were induced by illumination with laser at two wavelengths: 514 nm (ion argon laser) as well as in 630 nm (dye laser). The time constants of PDZ photobleaching were: 18 min for 630 nm irradiation and 50 min for 514 nm irradiation, suggesting that degradation after irradiation with red light is faster than with green light. Photoproducts formation was evidenced by the appearance of a new absorption band at 668 nm with slight broaden of the Soret band, suggesting that there was no break of the macrocycle. The cytotoxicity of the photodegradated PDZ was investigated and showed to be lower in the dark and higher than non irradiated PDZ. These results may have important clinical implications for PDT such as the possibility to use the previously irradiated PDZ just before clinical application in order to get increased efficiency.

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Authors and Affiliations

  1. Instituto de Química de São Carlos, Universidade de São Paulo, Av. Trabalhador saocarlense, 400-13566-590, São Carlos, SP, Brazil

    J. C. Correa, H. Imasato & J. R. Perussi

  2. Instituto de Física de São Carlos, Universidade de São Paulo, Av. Trabalhador saocarlense, 400-13566-590, São Carlos, SP, Brazil

    V. S. Bagnato

Authors
  1. J. C. Correa
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  2. V. S. Bagnato
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  3. H. Imasato
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  4. J. R. Perussi
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Correspondence to J. R. Perussi.

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Original Text © Astro, Ltd., 2012.

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Correa, J.C., Bagnato, V.S., Imasato, H. et al. Previous illumination of a water soluble chlorine photosensitizer increases its cytotoxicity. Laser Phys. 22, 1387–1394 (2012). https://doi.org/10.1134/S1054660X12090034

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  • DOI: https://doi.org/10.1134/S1054660X12090034

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