SELECTIVE PRECIPITATION OF HUMAN HEMOGLOBIN BY ORGANIC-SOLVENTS AND METAL-CATIONS

The interaction of human hemoglobin with several organic solvents and metal cation has been studied in order to obtain selective precipitati on of hemoglobin from solution. Alcohols, and preferably the mixture e thanol: butanol added to a final concentration of 8% (v/v) 1-butanol w as found to be superior in this respect, giving close to selective pre cipitation of hemoglobin from whole blood lysates. An equally specific precipitation was achieved by using zinc-chloride in 10-15 molar exce ss to hemoglobin. Contrary to organic solvents, complex formation with Zn2+ resulted in a reversible precipitation enabling renaturation usi ng strong chelating agents. Specificity of the hemoglobin-precipitatin g agents was verified by chromatographic and electrophoretic studies. Applications of the presented methods in analytical chemistry and in t he isolation and purification of blood proteins are discussed.