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pubmed-article:8786464pubmed:abstractTextBenzoporphyrin derivative monoacid ring A (BPD-MA) is a second-generation photosensitizer for photodynamic therapy (PDT) that has shown good results in phase I clinical trials. Similar to other porphyrin derivatives, BPD-MA readily photobleaches during in-vivo PDT treatment. This study investigated the photodegradation of BPD-MA in fetal calf serum (FCS) solutions in vitro. Absorption and fluorescence spectra from dilute solutions of BPD-MA in 10% FCS were recorded before and immediately after irradiation with light at 694 nm. After irradiation, the appearance of a new fluorescence emission band at 650 nm and changes in the fluorescence excitation spectra indicate the formation of a photoproduct. Photoproduct formation was observed only when BPD-MA was bound to FCS and in oxygenated solutions. The spectroscopy of the photoproduct is consistent with the reaction of an oxygen species with the ring B vinyl group, forming a hydroxyaldehyde photoproduct. Monitoring the increase in photoproduct fluorescence during treatment may provide an in-vivo dosimeter to measure PDT efficacy.lld:pubmed
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pubmed-article:8786464pubmed:pagination87-90lld:pubmed
pubmed-article:8786464pubmed:dateRevised2007-7-23lld:pubmed
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pubmed-article:8786464pubmed:year1996lld:pubmed
pubmed-article:8786464pubmed:articleTitleSpectral characterization of the benzoporphyrin derivative monoacid ring-A photoproduct formed in fetal calf solutions during irradiation with 694 nm continuous-wave radiation.lld:pubmed
pubmed-article:8786464pubmed:affiliationWellman Laboratories of Photomedicine, Massachusetts General Hospital, Boston, USA.lld:pubmed
pubmed-article:8786464pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:8786464pubmed:publicationTypeResearch Support, U.S. Gov't, Non-P.H.S.lld:pubmed
pubmed-article:8786464pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed