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Recovery of streptomycin from naphthol blue-black salt

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1. A METHOD FOR PREPARING A WATER-SOLUBLE STREPTOMYCIN SALT OF HIGH ANTIBIOTIC ACTIVITY WHICH COMPRISES SUBJECTING A STREPTOMYCIN SALT OF NAPHTHOL BLUE-BLACK TO METATHESIS IN A LIQUID MIXTURE OF A DILUTE AQUEOUS INORGANIC ACID OF THE CLASS CONSISTING OF HYDROCHLORIC SULFURIC ACID, AND A WATER-IMMISCIBLE ORGANIC SOLVENT OF THE CLASS CONSISTING OF BUTYL ALCOHOL AMYL ALCOHOL AND THE MONOPHENYL AND MONOBENZYL ETHERS OF ETHYLENE GLYCOL, WHILE MAINTAINING THE ACIDITY OF THE MIXTURE WITHIN THE RANGE AT WHICH THE STREPTOMYCIN IS RELATIVELY STABLE, THEREBY EXTRACTING THE NAPHTHOL BLUEBLACK IN THE ORGANIC PHASE OF SAID MIXTURE AND FORMING A SOLUTION OF THE DESIRED WATER-SOLUBLE STREPTOMYCIN SALT IN ITS AQUEOUS PHASE.
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