Development of an Integrated Screening Framework for Marine-Derived Bacillus Probiotics

Area of Science:

• Microbiology
• Marine Biotechnology
• Probiotics Research

Background:

• Probiotics enhance gut health and digestion, with Bacillus species being highly regarded for their safety and resilience.
• Current industrial Bacillus probiotics are mainly terrestrial, overlooking the potential of marine microbial resources.
• Marine environments represent a largely untapped reservoir for novel probiotic strains.

Purpose of the Study:

• To develop and apply a multi-stage methodology for identifying and evaluating marine-derived Bacillus strains with probiotic potential.
• To explore the functional properties, including digestive enzyme production and pathogen inhibition, of these marine strains.
• To assess the antimicrobial efficacy of selected strains against pathogenic bacteria.

Main Methods:

• A structured screening pipeline was employed on 67 microbial isolates from Great Barrier Reef sponges.
• Initial screening focused on essential probiotic traits: growth, stability, safety, and gastrointestinal survival.
• Subsequent assessments included digestive enzyme activity and pathogen inhibition assays.

Main Results:

• Three marine-derived Bacillus strains were identified as potential probiotics through the screening process.
• One identified strain exhibited significant antimicrobial activity against Salmonella Enterica at concentrations of 5 and 10 mg/mL (p < 0.01).
• The study successfully demonstrated the feasibility of isolating functional probiotic strains from marine sources.

Conclusions:

• Marine-associated Bacillus species hold significant potential as novel bioproducts with valuable functional properties.
• The developed methodology is effective for discovering marine probiotics with antimicrobial capabilities.
• Further research into marine-derived Bacillus strains could lead to new advancements in probiotic applications.