TY - JOUR
T1 - Evaluation of culture medium for nisin production in a repeated-batch biofilm reactor
AU - Pongtharangkul, Thunyarat
AU - Demirci, Ali
PY - 2006/1
Y1 - 2006/1
N2 - In this study, a biofilm reactor with plastic composite support (PCS), made by high-temperature extrusion of agricultural products and polypropylene, was evaluated for nisin production using L. lactis strain NIZO 22186. The high-biomass density of the biofilm reactor was found to contribute to a significantly shorter lag time of nisin production relative to a suspended-cell reactor. In comparison to glucose (579 IU/mL), sucrose significantly increased the nisin production rate by 1.4-fold (1100 IU/mL). However, results revealed that high levels of sucrose (8% w/v) had a suppressing effect on nisin production and a stimulating effect on lactic acid production. A high concentration of MgSO4·7H2O at 0.04% (w/v) was found to reduce the nisin production, while concentrations of KH 2PO4 of up to 3% (w/v) did not have any significant effect on growth or nisin production. The best of the tested complex media for nisin production using the PCS biofilm reactor consisted of 4% (w/v) sucrose, 0.02% (w/v) MgSO4·7H2O, and 0.1% (w/v) KH 2PO4. Nisin production rate in the biofilm reactor was significantly increased by 3.8-fold (2208 IU/mL) when using the best complex medium tested.
AB - In this study, a biofilm reactor with plastic composite support (PCS), made by high-temperature extrusion of agricultural products and polypropylene, was evaluated for nisin production using L. lactis strain NIZO 22186. The high-biomass density of the biofilm reactor was found to contribute to a significantly shorter lag time of nisin production relative to a suspended-cell reactor. In comparison to glucose (579 IU/mL), sucrose significantly increased the nisin production rate by 1.4-fold (1100 IU/mL). However, results revealed that high levels of sucrose (8% w/v) had a suppressing effect on nisin production and a stimulating effect on lactic acid production. A high concentration of MgSO4·7H2O at 0.04% (w/v) was found to reduce the nisin production, while concentrations of KH 2PO4 of up to 3% (w/v) did not have any significant effect on growth or nisin production. The best of the tested complex media for nisin production using the PCS biofilm reactor consisted of 4% (w/v) sucrose, 0.02% (w/v) MgSO4·7H2O, and 0.1% (w/v) KH 2PO4. Nisin production rate in the biofilm reactor was significantly increased by 3.8-fold (2208 IU/mL) when using the best complex medium tested.
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U2 - 10.1021/bp050295q
DO - 10.1021/bp050295q
M3 - Article
C2 - 16454513
AN - SCOPUS:32344438324
SN - 8756-7938
VL - 22
SP - 217
EP - 224
JO - Biotechnology progress
JF - Biotechnology progress
IS - 1
ER -