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PICOSECOND FLUORESCENCE OF R3230AC MAMMARY CARCINOMA MITOCHONDRIA AFTER TREATMENT WITH HEMATOPORPHYRIN DERIVATIVE and PHOTOFRIN ® II in vivo
Author(s) -
Hanzlik Cheryl A.,
Knox Robert S.,
Gibson Scott L.,
Hilf Russell
Publication year - 1989
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1989.tb04128.x
Subject(s) - hematoporphyrin , fluorescence , picosecond , in vivo , porphyrin , chemistry , photosensitizer , photochemistry , photodynamic therapy , biophysics , derivative (finance) , laser , organic chemistry , optics , biology , physics , microbiology and biotechnology , financial economics , economics
— Hematoporphyrin derivative(HPD) and other porphyrin samples were excited by 20‐ps 532‐nm laser pulses. Fluorescence was detected using a low‐jitter streak camera. Data were fitted to a sum of exponential decay times on the order of picoseconds. Fluorescence of porphyrins in aqueous solution show various behaviors depending on the hydrophobicity of the porphyrins. The most hydrophilic porphyrins show long decays only(500 ps). Porphyrins intermediate in hydrophobicity have intensity‐dependent fast decays. The most hydrophobic have fast decays (< 20 ps). Picosecond fluorescences of mitochondria prepared from rat tumors treated in vivo with HPD or Photofrin II show an increase in the ratio of fast to slow decays when compared to the injected porphyrins. These results are consistent with the concentration of the more hydrophobic porphyrins in mitochondria in photosensitization treatment. Thus picosecond fluorescence studies of porphyrins may provide a means to obtain photoproperties which differentiate between effective and ineffective in vivo photosensitizers.