4.7 Article

Antimicrobial activity and partial characterization of bacteriocin-like inhibitory substances produced by Lactobacillus spp. isolated from artisanal Mexican cheese

期刊

JOURNAL OF DAIRY SCIENCE
卷 98, 期 12, 页码 8285-8293

出版社

ELSEVIER SCIENCE INC
DOI: 10.3168/jds.2015-10104

关键词

bacteriocin; lactic acid bacteria; antimicrobial activity

资金

  1. National Council for Science and Technology (CONACYT) of Mexico
  2. SAGARPA-CONACYT Project [2010-144591]

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Lactobacillus spp. from Mexican Cocido cheese were shown to produce bacteriocin-like substances (BLS) active against Staphylococcus aureus, Listeria innocua, Escherichia coli, and Salmonella typhimurium by using the disk diffusion method. Crude extracts of Lactobacillus fermentum showed strong inhibitory activity against Staph. aureus, L. innocua, E. coli, and Salmonella cholerae. Complete inactivation of antimicrobial activity was observed after treatment of crude extracts with proteinase K, pronase, papain, trypsin, and lysozyme, confirming their proteinaceous nature. However, antimicrobial activity was partly lost for some of the crude extracts when treated with a-amylase, indicating that carbohydrate moieties were involved. The antimicrobial activity of the crude extracts was stable at 65 degrees C for 30 min over a wide pH range (2-8), and addition of potassium chloride, sodium citrate, ethanol, and butanol did not affect antibacterial activity. However, antimicrobial activity was lost after heating at 121 degrees C for 15 min, addition of methanol or Tween 80. Fourteen out of 18 Lactobacillus spp. showed antimicrobial activity against different test microorganisms, and 12 presented bacteriocin-like substances. Generation time and growth rate parameters indicated that the antimicrobial activity of crude extracts from 3 different strains was effective against the 4 indicator microorganisms. One of the crude extracts showed inhibition not only against gram-positive but also against gram-negative bacteria. Bacteriocin-like substances produced by this specific Lactobacillus strain showed potential for application as a food biopreservative.

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