High hydrostatic pressure inactivation of Lactobacillus plantarum cells in (O/W)-emulsions is independent from cell surface hydrophobicity and lipid phase parameters

T. A. Kafka, D. Reitermayer, C. A. Lenz, R. F. Vogel

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Inactivation efficiency of high hydrostatic pressure (HHP) processing of food is strongly affected by food matrix composition. We investigated effects of fat on HHP inactivation of spoilage-associated Lactobacillus (L.) plantarum strains using defined oil-in-water (O/W)-emulsion model systems. Since fat-mediated effects on HHP inactivation could be dependent on interactions between lipid phase and microbial cells, three major factors possibly influencing such interactions were considered, that is, cell surface hydrophobicity, presence and type of surfactants, and oil droplet size. Pressure tolerance varied noticeably among L. plantarum strains and was independent of cell surface hydrophobicity. We showed that HHP inactivation of all strains tended to be more effective in presence of fat. The observation in both, surfactant-stabilized and surfactant-free (O/W)-emulsion, indicates that cell surface hydrophobicity is no intrinsic pressure resistance factor. In contrast to the presence of fat per se, surfactant type and oil droplet size did not affect inactivation efficiency.

Original languageEnglish
Pages (from-to)430-448
Number of pages19
JournalHigh Pressure Research
Volume37
Issue number3
DOIs
StatePublished - 3 Jul 2017

Keywords

  • High hydrostatic pressure
  • Lactobacillus plantarum
  • emulsion
  • fat
  • food spoilage
  • surface hydrophobicity

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