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Structure of Heme

by Scott Prahl, Oregon Medical Laser Center

heme structure

A model of heme.(Click to enlarge.)

mol. wt. 616.48 C34H32FeN4O4; It is the color furnishing portion of hemoglobin. Absorption max in phosphate buffer at ph 7 is ~550, 575 nm. Sparingly soluble in glacial acetic acid; frreely soluble in prsence of xygen. Very unstable.
--Merck Index

Heme is very similar to protoporphyrin IX. See below.
heme-structure protoporphyrin IX structure

© SAP 8 June 1998