A low-power ultrasound attenuation improves the stability of biofilm and hydrophobicity of Propionibacterium freudenreichii subsp. freudenreichii DSM 20271 and Acidipropionibacterium jensenii DSM 20535.

Abstract:

:The main topic of this paper was to study the effect of ultrasound-attenuation (US) on the surface properties of propionibacteria (Acidipropionibacterium jensenii DSM 20535 and Propionibacterium freudenreichii DSM 20271). A preliminary screening was done by using different power levels (40 and 60%) and treatment times (4, 6, and 8 min); immediately after sonication, acidification and viable count were tested. The best combinations to avoid post-acidification after 6 h were the following: A. jensenii DSM 20535: power, 40%; time, 8 min; P. freudenreichii subsp. freudenreichii DSM 20271: power, 60%; time, 4 min. Moreover, the effect of US on the growth patterns, surface properties (biofilm formation and hydrophobicity), resistance to some selected antibiotics, and release of intracellular components was evaluated; the experiments were done immediately after the treatment. US-treatment improved the stability of biofilm after 5-7 days, caused an increase of hydrophobicity (from 15 to 27%) immediately after sonication, and determined an increase of cell permeability, as suggested by the release of intracellular components within 24 h and by the increased sensitivity to some antibiotics. This paper is the first report on US-attenuation on propionibacteria and could the background for future researches to modulate the surface properties of these microorganisms.

journal_name

Food Microbiol

journal_title

Food microbiology

authors

Bevilacqua A,Racioppo A,Sinigaglia M,Speranza B,Campaniello D,Corbo MR

doi

10.1016/j.fm.2018.10.010

subject

Has Abstract

pub_date

2019-04-01 00:00:00

pages

104-109

eissn

0740-0020

issn

1095-9998

pii

S0740-0020(18)30625-7

journal_volume

78

pub_type

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