Purification and Preparation of Moenomycin A from Fermentation Broth by Multidimensional Chromatography

Based on various adsorption characteristics of resins, a novel method for purifying and preparing moenomycin A from fermentation broth was established by combining different chromatographic modes into a three-step preparative chromatography process. Fermentation broth of moenomycins was firstly prepurified by macroporous adsorbent XAD7HP to remove most strong polar impurities, then further purified by anion exchange resin FPA98Cl, and finally refined moenomycin A was obtained by use of semi-preparative reversed-phase chromatographic column packed with Chromtorex C8 silica gel. As the main indicators, purity and yield of moenomycin A were examined in order to optimise the chromatographic process for each step. Under optimized chromatographic conditions, the purity and total yield of moenomycin A were 95.0 and 22.2 %, and the biological potency of moenomycin A was 2232 U mg−1, significantly higher than 1395 U mg−1, which is the potency of the standard from Agriculture Ministry of China. Three-step preparative chromatographic mode could gradually and effectively remove impurities. The present method is practical, easy to be operated with less solvent consumption, and provides a new idea for the preparation of moenomycin A with high purity.