Abstract
Summary
A tissue culture assay employing Eagle's KB epidermoid carcinoma has been described which measured streptovitacin A concentrations between 0.02 and 0.25 μg/ml. Tissue culture assay measured streptovitacin A potency in crude beers and extraction preparations, in addition to crystalline material. Cycloheximide was also inhibitory to KB cells with an ID50 of 0.1 μg/ml. Standard error per ID50 determination was 15%, and per relative potency determination, 8%.
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