THE ISOLATION AND CHARACTERIZATION OF NARASIN, A NEW POLYETHER ANTIBIOTIC

Abstract

Narasin is a new polyether antibiotic produced by a strain of Streptomyces aureofaciens.It is purified by organic solvent extraction and silica gel chromatography. Narasin is active in vitro against gram-positive bacteria, anaerobic bacteria, and fungi and is effective in protecting chickens from coccidial infections.