Optimization of medium and pH control profile in biofilm fermentation for nisin production

Thunyarat Pongtharangkul, Ali Demirci

Research output: Contribution to conferencePaperpeer-review

1 Scopus citations


In this study, biofilm reactor with Plastic Composite Support (PCS), made by high temperature extrusion of agricultural products and polypropylene, has been evaluated on nisin production using L. lactis NIZO 22186. High-biomass density characteristic of biofilm reactor was found to contribute in a significantly shorter lag time of nisin production. In comparison to glucose, sucrose significantly increased nisin production rate by 1.4-fold. However, obtained data also revealed a suppressing effect of high level of sucrose on nisin production and its stimulating effect on lactic acid production. High concentration of MgSO47H2O at 0.04% was found to reduce the nisin production, while concentration of KH2PO 4Of up to 3% did not have any significant effect on growth or nisin production. The optimal complex media for nisin production using PCS bio film reactor consisted of 4% sucrose, 0.02% MgSO4JH2O, and 0.1% KH2PO4. Nisin production rate in biofilm reactor was significantly increased by 3.8-fold when using an optimized medium. Higher nisin could be obtained with a simple adjustment in the pH-control profile by allowing the pH to drop freely via autoacidification after 4 h of fermentation.

Original languageEnglish (US)
StatePublished - 2005
Event2005 ASAE Annual International Meeting - Tampa, FL, United States
Duration: Jul 17 2005Jul 20 2005


Other2005 ASAE Annual International Meeting
Country/TerritoryUnited States
CityTampa, FL

All Science Journal Classification (ASJC) codes

  • General Agricultural and Biological Sciences
  • Bioengineering


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