Fig. 2

HPLC analysis of culture broths of S. clavuligerus. The broth of cultures grown in SA medium (discontinuous lane) and TSB medium (continuous line) were analyzed as indicated in “Methods”. The peak with a retention time of 6.0 min coincides with pure commercial naringenin (N). Pure genistein (G) used as standard has a retention time of 5.4 min