Abstract
To identify the prosthetic group of hemoglobin (Hb) and myoglobin (Mb) of fish, some properties of hemin and porphyrinesters prepared from Hb and Mb of yellowfin tuna, Neothunnus macropterus, were compared with those obtained from horse Hb. There were no apparent differences in the crystal form among the three hemins, among the three protoporphyrindimethylesters and among the three mesoporphyrindimethylesters. The iron content of these hemin preparations was almost same, and agreed fairly well with the theoretical value. No melting-point depression was observed in the mixed samples of protoporphyrindimethylesters and so was the case with mesoporphyrindimethylesters. Absorption spectra of some derivatives of the three pigments were in a good agreement with one another both in the near ultra-violet and visible regions and in the infrared region (Figs. 1 and 2). From these results it may be concluded that the prosthetic group of Hb and Mb of tuna (and perhaps of fish in general) is the same as both pigments of mammals, the iron complex of protoporphyrin IX.
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