Production of cyclodepsipeptides destruxin A and B from Metarhizium anisopliae

Maltose and peptone were the best carbon and nitrogen sources for the produ ction of destruxins from Metarhizium anisopliae. With the addition of 0.1% (w/v) beta -alanine to the basal medium, the yields of cyclodepsipeptides D A and DB were 7.2 and 279 mg/ L, respectively, which was 2-fold higher than that of control experiment. Response surface methodology (RSM) was applied to optimize the compositions of maltose, peptone, beta -alanine, and gluco se used in a shaker-flask cultivation of M. anisopliae for the production o f DA and DB. Estimated optimal compositions for the DA production were malt ose 2.58%, peptone 0.72%, beta -alanine 0.02%, and glucose 0.55%. The predi cted DA yield was 18.5 mg/L. On the other hand, the optimal compositions fo r DB production were maltose 2.51%, peptone 0.75%, beta -alanine 0.02%, and glucose 0.43%. A maximum DB yield of 232 mg/L was predicted. These were co nfirmed by cultivation experiments conducted at the optimized conditions fo r maximum destruxins production in a shaker-flask. Furthermore, a modest hi gh level of DA (49 mg/L) and DB (268 mg/L) yields were obtained by employin g the response surface methodology optimized DB production medium in a no-b affle, stirred-tank fermenter.