Fluorimetric studies on the dimerization equilibrium of protoporphyrin IX and its haemato derivative.

@article{Margalit1983FluorimetricSO,
  title={Fluorimetric studies on the dimerization equilibrium of protoporphyrin IX and its haemato derivative.},
  author={Rimona Margalit and Nurith Shaklai and S. Cohen},
  journal={The Biochemical journal},
  year={1983},
  volume={209 2},
  pages={
          547-52
        }
}
The aggregations of protoporphyrin IX and haematoporphyrin IX in aqueous solutions were studied by fluorimetric techniques. Porphyrin concentrations were limited to 0.001-0.1 microM and 0.01-1 microM for protoporphyrin and haematoporphyrin respectively, where dimerization is the dominant aggregation process. The dimerization equilibrium constants (at 25 degrees C, neutral pH, 50 mM-Tris/HCl buffer) were determined to be 3 X 10(7) M and 4 X 10(5) M for the proto and the haemato derivatives… 
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Results indicate that the porphyrins partition into the membrane with their carboxylic moieties near the lipid–water interface so that their deprotonation, leading to a charged molecule, does not prevent the insertion of the tetrapyrrole ring into the lipid environment of neutral liposomes.
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TLDR
Results indicate that the porphyrins partition into the membrane with their carboxylic moieties near the lipid–water interface so that their deprotonation, leading to a charged molecule, does not prevent the insertion of the tetrapyrrole ring into the lipid environment of neutral liposomes.
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