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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Photophysical and Complexation Studies of Chloro-Aluminum Phthalocyanine with Beta-Cyclodextrin and Hydroxypropyl-Beta-Cyclodextrin

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Autor(es):
Silva, Angelo Roncalli A. [1] ; Simioni, Andreza R. [2] ; Tedesco, Antonio C. [2, 1]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Fac Ciencias Farmaceut Ribeirao Preto, Programa Posgrad Ciencias Farmaceut, BR-14040903 Ribeirao Preto, SP - Brazil
[2] Univ Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preto, Dept Quim, Lab Fotobiol & Fotomed, BR-14040901 Ribeirao Preto, SP - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: Journal of Nanoscience and Nanotechnology; v. 11, n. 5, p. 4046-4055, MAY 2011.
Citações Web of Science: 11
Resumo

A variety of nanostructures are being investigated as functional drug carriers for treatment of a wide range of diseases, most notably cardiovascular defects, autoimmune diseases, and cancer. The aim of this present contribution is to evaluate potentially applicable nanomaterials in the diagnosis and treatment of cancer due to their photophysical and photobiological properties and complexation behavior. The delivery systems consisted of chloro-aluminum phthalocyanine associated with beta-cyclodextrin and hydroxypropyl-beta-cyclodextrin. The preparation of the complex and its stoichiometry in an ethanol/buffer (3:1) solution were studied by spectroscopic techniques, which were defined as 1:2. The inclusion complex in the nanometer scale was observed on the basis of changes to the spectroscopic properties. The singlet oxygen production and complex photophysical parameters were determined by measuring luminescence at 1270 nm and by steady state and time resolved spectroscopic, respectively. The preparation of the complex was tested and analyzed with regard to cellular damage by visible light activation. The inclusion complex showed a higher singlet oxygen quantum yield compared with other systems and other photoactive dyes. There was also a reduction in the fluorescence quantum yield compared with the results obtained for zinc phthalocyanine in organic medium. The results reported clearly that the inclusion complex chloro-aluminum phthalocyanine/cyclodextrin showed some changes in its spectroscopy properties leading to better biodistribution and biocompatibility with a potential application in photodynamic therapy, especially in the case of neoplasy. Additionally, it also has non-oncological applications as a drug delivery system. (AU)

Processo FAPESP: 09/51729-5 - Estudos de fármacos fotossensíveis em modelos tridimensionais de pele em matriz de colágeno: avaliação da ação fotodinâmica no processo de cicatrização tecidual
Beneficiário:Andreza Ribeiro Simioni
Linha de fomento: Bolsas no Brasil - Pós-Doutorado