Protective effect of reuterin-producing Lactobacillus reuteri against Listeria monocytogenes and Escherichia coli O157H7 in semi-hard cheese

Bioprotective effect of reuterin-producing Lactobacillus reuteri INIA P572 was assessed in cheeses artificially contaminated with Listeria monocytogenes and Escherichia coli O157:H7 and ripened for 30 days. Reuterin production in cheese made with L. reuteri INIA P572 supplemented with 100 mM glycerol was confirmed up to 7 d of ripening with a maximum of 5.2 μmol/g at 1 day. L. reuteri was able to survive up to 5.37 log cfu/g in 30 d control cheese, although it was reduced to 2.59 log cfu/g when added simultaneously with glycerol. L. monocytogenes counts in control cheese were 4.31 log cfu/g after 30 days of ripening, whereas in cheese made with L. reuteri INIA P572 and 100 mM glycerol, this pathogen was only detectable by enrichment of 25 g samples from day 7 onwards. This antimicrobial strategy also diminished E. coli O157:H7 counts on day 1 by 5.53 log units with respect to control cheese. After 30 d, E. coli O157:H7 counts were 0.85 log cfu/g in control cheese, but the pathogen was not detected in 25 g cheese made with L. reuteri and 100 mM glycerol from day 7 onwards. Reuterin production in situ might be a feasible alternative to improve cheese safety that could also be exploited in the control of other undesirable microorganisms.

Bibliographic Details

Main Authors:	Langa Marcano, Susana, Martín-Cabrejas, I., Montiel, R., Peiroten Herrero, Angela, Medina, M., Arques Orobón, Juan Luis
Format:	artículo biblioteca
Language:	English
Published:	Elsevier 2018
Subjects:	Reuterin production, Lactobacilus reuteri, Listeria monocytogenes, Escherichia coli O157:H7, Cheese, Swine/genetics,
Online Access:	http://hdl.handle.net/20.500.12792/600 http://hdl.handle.net/10261/290745
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