Abstract
Summary
1. The purity of crude hemin preparations used, as determined by their iron content, was improved by recrystallization. 2. Crude hemin preparations in borate buffer showed variable extinction coefficients at any wavelength selected along the flat portions of the absorption spectra. Recrystallized hemin preparations from the above crude hemin samples showed very nearly equal extinction coefficients at the same wavelength. 3. Dilute solutions of recrystallized hemin from different sources were more uniformly stable than dilute solutions of crude hemin during a one-month period.
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