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Antimicrobial compounds from Lactobacillus casei and Lactobacillus helveticus
M Vescovo1, G L Scolari, L Caravaggi
1Istituto di Microbiologia, Università Cattolica, Piacenza, Italy.
The New Microbiologica
|April 1, 1993
Summary
Lactobacillus strains show broad antimicrobial activity, producing compounds effective against various bacteria, including Clostridium tyrobutyricum. These potent inhibitory substances resist heat and enzymes, highlighting their stability.
Area of Science:
- Microbiology
- Food Science
- Biotechnology
Background:
- Lactic acid bacteria (LAB) are known for producing antimicrobial compounds.
- Investigating specific Lactobacillus strains for novel antagonistic activities is crucial for developing biopreservatives.
Purpose of the Study:
- To evaluate the antagonistic potential of Lactobacillus casei and Lactobacillus helveticus strains against various indicator microorganisms.
- To characterize the nature of the inhibitory compounds produced by these Lactobacillus strains.
Main Methods:
- Antimicrobial activity assays were performed using culture supernatants from four Lactobacillus strains against 25 indicator strains.
- Inhibitory activity was assessed under conditions excluding organic acid and hydrogen peroxide effects.
- The stability of the active compounds was tested against proteolytic enzymes and heat treatment.
Main Results:
- All tested Lactobacillus strains demonstrated broad-spectrum inhibitory activity against diverse microbial genera.
- One Lactobacillus casei strain produced an inhibitory compound effective against Clostridium tyrobutyricum.
- The identified active components were found to be resistant to both proteolytic enzymes and heat.
Conclusions:
- Lactobacillus casei and Lactobacillus helveticus strains possess significant antagonistic capabilities, producing stable antimicrobial compounds.
- These findings suggest potential applications for these Lactobacillus strains and their secreted compounds in controlling pathogenic and spoilage microorganisms, particularly Clostridium species.