Human interferon for clinical trials: removal of pyrogen by a simple two-step procedure

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Abstract
Commonly used preparations of human interferon are pyrogenic when used in humans for clinical trials. We describe a simple two-step procedure for the purification of human fibroblast interferon, employing Blue Sepharose chromatography and high-speed centrifugation. Such preparations are devoid of pyrogenic activity in a rabbit test system and are much more suitable for use in human clinical trials than previously used preparations.