fractionation of liver and neoplastic cells indicates that the subcellular distribution of liposome-delivered porphyrins is also dependent on their solubility properties : thus , relatively polar porphyrins , such as tetra ( 4-sulfonatophenyl ) porphine and uroporphyrin , are mainly recovered from the soluble fraction , whereas hydrophobic porphyrins , such as haematoporphyrin or porphyrin esters , preferentially partition in the cytoplasmic membrane .
C0042093
uroporphyrin
C0032712
porphyrin