porphyrin

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Related to Porphirine: porphyria, porphyrin test

porphyrin

 [por´fĭ-rin]
any of a group of iron- or magnesium-free cyclic tetrapyrrole derivatives, occurring universally in protoplasm, and forming the basis of the respiratory pigments of animals and plants; in combination with iron they form hemes. Examples include coproporphyrin, hematoporphyrin, protoporphyrin, and uroporphyrin. See also porphyria.

por·phin

, porphine (pōr'fin),
The unsubstituted cyclic tetrapyrrole nucleus that is the basis of the porphyrins.
See also: porphyrins. Compare: chlorin, phorbin, corrin.
Synonym(s): porphyrin

porphyrin

/por·phy·rin/ (por´fĭ-rin) any of a group of compounds containing the porphin structure to which a variety of side chains are attached, the nature of the side chain indicated by a prefix; they occur in the prosthetic groups of hemoglobins, myoglobin, and cytochromes, complexed with metal ions, and occur free in tissues in porphyrias. The term is sometimes used to include or to denote porphin specifically.
Enlarge picture
Porphyrin. (A), Pyrrole ring; (B), porphin ring; (C), protoporphyrin IX.

porphyrin

(pôr′fə-rĭn)
n.
Any of various organic compounds containing four pyrrole rings, occurring universally in protoplasm, and functioning as a metal-binding cofactor in hemoglobin, chlorophyll, and certain enzymes.

porphyrin

[pôr′fərin]
Etymology: Gk, porphyros, purple
any iron- or magnesium-free pyrrole derivative occurring in many plant and animal tissues. Normal findings of porphyrins in urine are 50 to 300 mg/24 hours.

porphyrin

an organic compound consisting of four pyrrole rings linked by CH bridges with a heavy metal in the centre. Porphyrins form part of several important biological molecules. Examples include the haem group of HAEMOGLOBIN and MYOGLOBIN (see Fig. 258 ), chlorophyll (with magnesium) and cytochromes (with iron).

Porphyrin

A type of pigment found in living things, such as chlorophyll, that makes plants green and hemoglobin which makes blood red.

porphyrin (pôr´fərin),

n any iron or magnesium-free pyrrole derivative occurring in many plant and animal tissues. Normal findings of porphyrins in urine are 60 mg to 200 mg/24-hour period.
Porphyromonas gingivalis
n a species of gram-negative, anaerobic, rod-shaped bacteria originally classified within the
Bacteroides genus. This bacterium produces a cell-bound, oxygen-sensitive collagenase and is isolated from the oral cavity.

porphyrin

any of a group of iron- or magnesium-free cyclic tetrapyrrole derivatives which forms the basis of the respiratory pigments of animals and plants. Porphyrins, in combination with iron, form hemes.

porphyrin test
the presence of porphyrin in cultures of Hemophilus spp. or Tayorella equigenitalis indicates that hemin is not required for growth.