a chemical containing a porphyrin ring which is composed of four linked pyrrole rings. Porphyrins are found in various blood and respiratory pigments and are the basis of heme (part of the bloods haemoglobin which carries oxygen to body tissue)
Any of a group of compounds containing the porphin structure, four pyrrole rings connected by methine (-CH=) bridges in a cyclic configuration, to which a variety of side chains are attached.
any of various pigments distributed widely in living tissues
a compound that reacts with light to produce a reddish brown stain to the medial canthus
a heterocyclic macrocycle A macrocycle is, as defined by IUPAC, "a cyclic macromolecule or a macromolecular cyclic portion of a molecule
Colored organic compounds which form the basis of respiratory pigments
a large carbon based ring with four nitrogen atoms facing a central hole; in heme, the nitrogens trap an iron atom in the hole; any one of a group of iron free or magnesium free pyrrole derivatives which form the basis of respiratory pigments in plants and animals; examples, hematoporphyrin, protoporphyrin, chlororphyllin and chorophyll.
A porphyrin is a heterocyclic macrocycle made from 4 pyrrole subunits linked on opposite sides (α position) through 4 methine bridges (=CH-). The macrocycle, therefore, is more aromatic than the related corrins, chlorins (2,3-dihydroporphyrin) and bacteriochlorins (2,3,12,13-tetrahydroporphyrin). The extensive conjugated system makes the compound chromatic, hence the name porphyrin, from a Greek word for purple.
