Abstract
A method for the determination of the heme a concentration in cytochrome c oxidase and cytochrome a preparations has been evaluated. Heme a in similar preparations will form a number of derivatives with functional groups of the protein. These reactions and their effect on the results of hemochromogen determinations are presented. The m M extinction coefficient of purified cytochrome c oxidase in the reduced form at 603 mμ is 21.6 and at 443 mμ is 108, while the m M extinction coefficient of cytochrome a at 601 mμ is 22.8 and at 439 mμ is 94.1.
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