Isolation, Characterisation and Fermentation Optimisation of Bacteriocin-Producing Enterococcus faecium

Abstract

Purpose

The aim of this work was to optimize a bacteriocin produced by Enterococcus faecium TJUQ1 and the potential application in vegetable wash solution.

Methods

The agar well diffusion method was applied to screening strains with antibacterial activity. It was identificated based on physiobiochemical characteristics and 16S rDNA sequence analysis. Response surface method (RSM) was applied to optimize bacteriocin yield and discover the best production condition.

Results

A total of 31 isolates of lactic acid bacteria (LAB) isolated from pickled Chinese celery were screened for bacteriocin production. Strain TJUQ1 showed an inhibition zone against Listeria monocytogenes CMCC 1595 as indicator by using agar well diffusion assay and identified as E. faecium. The culture parameters were further optimized using response surface methodology (RSM). By using Plackett–Burman (PB) design, beef extract, K2HPO4 and initial pH were found to be the most significant factors for bacteriocin activity. The effects of the three main factors on bacteriocin activity were further investigated using a central composite design (CCD) and the optimum composition was found to be beef extract 15.20 g/L, K2HPO4 1.93 g/L and initial pH 7.19. Optimum conditions were validated by experiment in which bacteriocin activity was increased 1.78-fold (816.87 ± 5.21 AU/mL) in 18 h fermentation. The bacteriocin-containing wash solutions showed activity against L. monocytogenes CMCC 1595 inoculated onto fresh-cut iceberg lettuce within the first 3 days of storage at 4 °C.

Conclusion

A bacteriocin-producing strain TJUQ1 isolated from pickled Chinese celery was identified as E. faecium. The strain produced a high level of bacteriocin and the bacteriocin-containing wash solutions showed activity against L. monocytogenes CMCC 1595 inoculated onto fresh-cut iceberg lettuce.

Graphical Abstract

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Acknowledgements

This work was financially supported by the financial aid from the National Science-Technology Support Program of China (2015BAD16B01).

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Correspondence to Ye Han or Zhijiang Zhou.

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Qiao, X., Du, R., Wang, Y. et al. Isolation, Characterisation and Fermentation Optimisation of Bacteriocin-Producing Enterococcus faecium. Waste Biomass Valor 11, 3173–3181 (2020). https://doi.org/10.1007/s12649-019-00634-9

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Keywords

  • Enterococcus faecium
  • Response surface methodology
  • Bacteriocin
  • Optimization
  • Wash solution