The purpose of this study was to investigate the photophysical properties of 3rd generation photosensitizer using in photodynamic therapy.The photophysical properties of tetra-carboxyl-aminohexanoic-sulfonyl phthalocyanine aluminium chloride (AlPc(SO2NHC5H10COOH)4)-bovine serum albumin(BSA)bioconjugate was studied by UV-Vis and fluorescence spectroscopic method.The results indicated AlPc(SO2NHC5H10COOH)4 exhibited lower aggregation,higher fluorescence intensity and longer lifetime compared with tetra-carbox...