Abstract:
:Three surfactin-producing Bacillus subtilis strains, C4, M1 and G2III, previously isolated from honey and intestines from the Apis mellifera L. bee, were phylogenetically characterized at sub-species level as B. subtilis subsp. subtilis using gyrA gene sequencing. The antagonistic effect of surfactin was studied against seven different Listeria monocytogenes strains, 6 of which were resistant to bacteriocins. Surfactin showed anti-Listeria activity against all 7 strains and a dose of 0.125 mg/mL of surfactin was enough to inhibit this pathogen. Surfactin sintetized by B. subtilis subsp. subtilis C4 inhibited the pathogen in lower concentrations, 0.125 mg/mL, followed by G2III and M1 with 0.25 and 1mg/mL, respectively. In particular, a dose of 0.125 mg/mL reduced the viability of L. monocytogenes 99/287 RB6, a bacteriocin-resistant strain, to 5 log orders. Surfactin assayed maintained anti-Listeria activity within a pH range of between 2 and 10, after heat treatment (boiling for 10 min and autoclaving at 121 °C for 15 min) and after treatment with proteolytic enzymes. These results suggest that surfactin can be used as a new tool for prevention and the control of L. monocytogenes in different environments, for example, in the food industry.
journal_name
Microbiol Resjournal_title
Microbiological researchauthors
Sabaté DC,Audisio MCdoi
10.1016/j.micres.2012.11.004subject
Has Abstractpub_date
2013-03-30 00:00:00pages
125-9issue
3eissn
0944-5013issn
1618-0623pii
S0944-5013(12)00132-2journal_volume
168pub_type
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