Abstract
In this study, probiotic biomass and nisin productions by Lactococcus lactis CECT 539 were followed in two realkalized fed-batch cultures in diluted whey (DW) supplemented with KH2PO4 up to a total phosphorus concentration of 0.459 g/L. Increased biomass (5.12 g/L, 2.18 × 1010 CFU/mL) and nisin (235.23 BU/mL) concentrations were obtained in the culture fed concentrated whey and concentrated mussel processing waste (CMPW) medium supplemented with glucose up to a concentration of 400 g/L (CMPW + G medium) compared with similar fed-batch fermentations in DW medium. In the second fed-batch fermentation, the feeding medium CMPW + G was supplemented with KH2PO4 up to a TP concentration of 3.21 g/L. With this approach, increased production of biomass (5.49 g/L, 2.33 × 1010 CFU/mL) and nisin (257.59 BU/mL) was obtained. Considering the substantial availability of these wastes at very low prices from local dairy and mussel processing plants in Galicia, their use as culture media could offer an attractive alternative for a low-cost production of probiotic biomass and nisin at a high scale.
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Abbreviations
- DW:
-
Diluted whey medium
- CW:
-
Concentrated whey medium
- MPW:
-
Mussel processing waste medium
- CMPW:
-
Concentrated mussel processing waste medium
- CG:
-
400 g/L concentrated glucose
- CMPW + G:
-
Concentrated mussel processing waste medium supplemented with glucose up to a concentration of 400 g/L
- TS:
-
Total sugars concentration
- TP:
-
Total phosphorus concentration
- CMPWCW-I:
-
Realkalized fed-batch fermentation in DW medium containing 0.459 g TP/L with feeding with a mixture of CW and CMPW + G medium
- CMPWCW-II:
-
Realkalized fed-batch fermentation in DW medium containing 0.459 g TP/L with feeding with a mixture of CW and CMPW + G medium supplemented with KH2PO4 to obtain the same C/P relationship noted in the MRS medium
- CDW:
-
Cell dry weight concentration (g/L)
- LA:
-
Lactic acid concentration (g/L)
- AA:
-
Acetic acid concentration (g/L)
- B:
-
Butane-2,3-diol concentration (g/L)
- G:
-
Glucose concentration (g/L)
- L:
-
Lactose concentration (g/L)
- Pr:
-
Protein concentration (g/L)
- TN:
-
Total nitrogen concentration (g/L)
- TP:
-
Total phosphorus concentration (g/L)
- Nis:
-
Nisin concentration (BU/mL or IU/mL)
- VCC:
-
Viable cell count (CFU/mL)
- P CDW :
-
Cell dry weight productivity (g/L/h)
- P Nis :
-
Nisin productivity (BU/mL/h)
- P LA :
-
Lactic acid productivity (g/L/h)
- P AA :
-
Acetic acid productivity (g/L/h)
- P B :
-
Butane-2,3-diol productivity (g/L/h)
- Y Nis/CDW :
-
Yield of nisin on cell dry weight (BU/mg)
- Y CDW/TSc :
-
Yield of cell dry weight on total sugars consumed (g/g)
- Y Nis/TSc :
-
Yield of nisin on total sugars consumed (BU/mg)
- Y CDW/TNc :
-
Yield of cell dry weight on total nitrogen consumed (g/g)
- Y Nis/TNc :
-
Yield of nisin on total nitrogen consumed (BU/mg)
- E L :
-
Efficiency in lactose consumption (g lactose consumed/g lactose supplied)
- E G :
-
Efficiency in glucose consumption (g glucose consumed/g glucose supplied)
- E TN :
-
Efficiency in total nitrogen consumption (g TN consumed/g TN supplied)
- E TP :
-
Efficiency in total phosphorus consumption (g TP consumed/g TP supplied)
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Acknowledgements
The research presented in this paper was financially supported by the Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Spain (project CAL01-045-C2-2) and The Xunta de Galicia, Spain (project PGIDT00BIO1E). We thank Coren S.C.L. for their collaboration in the elaboration of this work. Results concerning the evaluation of L. lactis CECT 539 probiotic properties were included in a previous publication (Guerra et al. 2007a).
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Costas Malvido, M., Alonso González, E., Outeiriño, D. et al. Production of a highly concentrated probiotic culture of Lactococcus lactis CECT 539 containing high amounts of nisin. 3 Biotech 8, 292 (2018). https://doi.org/10.1007/s13205-018-1318-8
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DOI: https://doi.org/10.1007/s13205-018-1318-8