Nisin and pediocin production on mussel-processing waste supplemented with glucose and five nitrogen sources

Aims: Optimization of bacteriocin production by L. lactis subsp. lactis CECT 539 and Ped. acidilactici NRRL B-5627 on mussel-processing wastes. Methods and Results: The concentrations of glucose and five nitrogen sources that optimize nisin and pediocin production were determined using a second order orthogonal factorial design. NH4Cl, glycine and glutamic acid were poor nitrogen sources. Enhanced pediocin and nisin productions were achieved in a medium supplemented with yeast extract or Bacto casitone. Conclusions: Mussel-processing wastes could be successfully used as a culture medium for bacteriocin production at low production cost. Significance and Impact of the Study: Average optimization led to a threefold increase in pediocin production (from 322 to 934 BU ml(-1)) and in nisin production (from 32 to 100 BU ml-1) when compared with the unsupplemented medium. For this reason, mussel-processing waste warrants further investigation due to its potential use as a cheap culture medium for upscaling bacteriocin production.