The content of glycogenolytic factor in some insulin samples

Abstract
Two methods were used for the assay oof glycogenolytic factor in insulin samples. The 1st, or single-dose method, allows rapid testing of samples and gives an approx. estimate of activity; the 2d, or multiple-dose method, requires testing at several concns. and statistical treatment of results. Twenty-three commercial insulin samples were assayed. The glycogenolytic-factor content was found to vary considerably; no samples were found to have a higher activity than the sample used as a standard (prepared by Eli Lilly and sent to us in 1947). Several were free from glycogenolytic factor.
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