The anti-MRSA activity was confirmed in new 10 mL fermentations and a preliminary LC-MS
analysis showed similar profiles in the three extracts, with a principal component (UV absorption
maxima at 218, 307 and 349 (sh) nm) of 1514.366 Da and others minor components. The strain
Kocuria sp. F-276,345 was then selected for further studies on the production and characterization of
this antibacterial compound that was later identified by Martín et al. (2012) [42] as kocurin, a new
member of the thiazolyl peptide family of antibiotics (Figure 2).