Hemerythrin iron content

Except for the iron content, chemical analysis has only been performed on hemerythrin from Sipunculus. Leaving aside the results of Griffiths (1892a) and Cuenot (1900) because the preparations used cannot have been pure, the only data existing in the literature is that of Roche (1934, 1935). (See Table II.)... 

According to Roche, the iron content of Sipunculus hemerythrin is 1.01%. Kubo (1953a), using the pigment from Phascolosoma, also... 

According to Ranzi (1938) hemocyanin is formed in the embryo of Sepia at the XVIth Naef s stage of development and the copper content, which equals 9 X 10 mg. in the egg at the beginning of development, is ten times as great in hatching embryo. The adult animal contains notable quantities of copper but it is not known how much of it derives from sea water and how much from food. Only with Phascolosoma hemerythrin have experiments been performed on the incorporation of radioactive iron (Schulman, 1957). The incorporation is fifteen times greater in hemolyzed cells than in whole cells because of the low permeability of the cell membranes towards ferric ions. According to the... 

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