Abstract
ABSTRACT
The rise of multidrug‐resistant (MDR) pathogens presents a major challenge to food safety, particularly in preservation approaches. Lactic acid bacteria (LAB) gain probiotic recognition by effectively controlling MDR pathogens using antimicrobial substances (AMSs) and bacteriocin‐like inhibitory substances (BLISs). The study evaluated the probiotic properties and AMS production potential of five LAB strains:
Lactiplantibacillus plantarum
NBRC 3070 (LP),
Lactobacillus acidophilus
ATCC 4356 (LA),
Lacticaseibacillus casei
ATCC 393 (LC),
Lacticaseibacillus rhamnosus
GG ATCC 53103 (LGG), and
Bifidobacterium animalis
subsp.
lactis
ATCC 27673 (BAL). AMS was extracted from neutralized and concentrated cell‐free supernatant and tested for antimicrobial activities against common foodborne pathogens using minimum inhibitory concentrations (MICs). All LAB strains showed antagonistic activity, with LP demonstrating the most substantial antagonism. Four strains are resistant to multiple antibiotics but remain susceptible to azithromycin and tetracycline, while LP is resistant to all tested antibiotics. LP and LC demonstrated the highest probiotic potential based on cell surface hydrophobicity and aggregation abilities. Optimal AMS activity (85.36%–91.29%) occurred between 24 and 36 h at 37°C or 28–48 h at 30°C. LGG exhibited the highest AMS activity with the lowest MIC against
Salmonella enterica serovar
Typhimurium. Enzyme sensitivity confirmed the peptide nature of BLIS produced by BLIS from LP, LA, LC, and LGG. In conclusion, LAB strains demonstrated significant probiotic traits and the ability to produce AMS, especially BLIS, from four strains, with LP and LC showing the most potential. These findings support their application as natural biopreservation against MDR pathogens; however, further validation in the food system is required.