Fig. 5.

Structure of hematin and GS.hematin. Carbon is depicted in grey, oxygen in red, nitrogen in blue, iron in brown and sulfur in yellow. (a)—Hematin structure, the two hydrophilic carboxylate groups of the porphyrin ring are positioned at one end of the ring whilst the hydrophobic vinyl groups are at the opposite end of the planar molecule. (b)—GS.hematin structure, with the addition of two carboxylate groups and an amine group the complex is less hydrophobic and more bulky when compared to the planar hematin molecule