Abstract
The spectral-fluorescent properties of various supramolecular systems based on chlorin e6 (Ce6) are determined to facilitate the development of new medicines for photodynamic therapy and diagnostics. The effect of various excipients, such as poly-N-vinylpyrrolidone (PVP), polyethylene glycol (PEG), bovine serum albumin (BSA), chitosan, Triton X-100 (TX-100), sodium hexametaphosphate (SHMP), and poly(dimethyldiallylammonium chloride) chloride (PDDAC), on the optical absorption and fluorescence of Ce6 is demonstrated. In the Ce6−PVP, Ce6−PEG, Ce6−BSA, Ce6−TX-100, Ce6−SHMP, and Ce6−PDDAC systems, Ce6 molecules are disaggregated and complexes thereof with excipients are formed. The quantum yield of Ce6 fluorescence in supramolecular systems is close to that of the free-form photosensitizer, in the absence of excipients. The results suggest that supramolecular complexes of Ce6 are promising for the development of medicines with controllable photodynamic activity.
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