Identification and evaluation of the probiotic potential of Lactobacillus paraplantarum FT259, a bacteriocinogenic strain isolated from Brazilian semi-hard artisanal cheese

Author(s)

Tulini, Fabricio Luiz ^[1] ; Winkelstroeter, Lizziane Kretli ^[1] ; De Martinis, Elaine C. P. ^[1]

Affiliation

^[1] Univ Sao Paulo, Fac Ciencias Farmaceut Ribeirao Preto, BR-14040903 Sao Paulo - Brazil

• Document type: Journal article
• Source: Anaerobe; v. 22, p. 57-63, AUG 2013.
• Web of Science Citations: 29

Abstract

This study aimed to identify a bacteriocinogenic Lactobacillus isolate (FT259) obtained from Brazilian semi-hard Minas type cheese and to evaluate its probiotic and antimicrobial potentials. The strain was identified by biochemical tests (at genus level), and by 16S rDNA sequencing combined with recA gene amplification (for species). To determine the inhibitory spectrum towards food borne pathogens and lactic acid bacteria, the spot-on-the-lawn assay was carried out. Moreover, the proteinaceous nature of the antimicrobial compound produced was evaluated by susceptibility to degradation by proteolytic enzymes. The isolated strain was tested for survival in acidified culture media (pH 2.0, 2.5 and 3.5), in vitro tolerance to bile salts and viability under gastric conditions. Adhesion of Lactobacillus paraplantarum FT259 to Caco-2 cells was evaluated by surface plate count on De Man, Rogosa, and Sharpe (MRS) agar and also by FISH method (fluorescent in situ hybridization) with the aid of Eub338 probe for fluorescence microscopy analysis. The isolate was identified as L paraplantarum FT259 and it produced bacteriocins that inhibited the growth of Listeria monocytogenes, Listeria innocua and several lactic acid bacteria. It was also observed that L paraplantarum FT259 tolerated exposure to pH 3.5, and bile salts 0.3% for up to 180 min. In experiments with simulated gastric juice, viable cells of L. paraplantarum FT259 decreased from 8.6 log CFU/mL to 3.5 log CFU/mL after 180 min. For the same strain, in studies with Caco-2 cells, 74% of adhesion was observed through plate count and FISH assays. It was also demonstrated isolated FT259 was susceptible to the majority the antibiotics tested. Overall, the results indicated L paraplantarum FT259 is a potential probiotic and the production of bacteriocin may be an interesting feature for food applications. (C) 2013 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 09/51141-8 - Gene expression analysis, biofilm formation and adherence to Caco-2 cells by Listeria monocytogenes in different conditions found in food
• Grantee: Elaine Cristina Pereira de Martinis
• Support Opportunities: Regular Research Grants
• FAPESP's process: 11/11983-0 - Isolation of lactic acid bacteria from milk and cheese with potential for food biopreservation and utilization for increasing whey digestibility
• Grantee: Fabricio Luiz Tulini
• Support Opportunities: Scholarships in Brazil - Doctorate