Multi enzyme production and alginate encapsulation from Bacillus subtilis for stable feed additives

Area of Science:

• Biotechnology
• Enzyme Engineering
• Microbial Fermentation

Background:

• Microbial enzymes are crucial for improving feed digestibility in livestock.
• Key challenges include high production costs and poor enzyme stability under processing and storage conditions.
• Developing robust enzymes is essential for effective application in animal nutrition.

Purpose of the Study:

• To optimize the simultaneous production of four essential enzymes (protease, lipase, cellulase, amylase) from Bacillus subtilis.
• To enhance the stability and performance of these enzymes through alginate encapsulation.
• To evaluate the impact of encapsulation on enzyme activity, pH, temperature ranges, and storage stability.

Main Methods:

• Response surface methodology was employed to optimize the production of protease, lipase, cellulase, and amylase.
• Purified enzymes were encapsulated within alginate beads.
• Enzyme activity, pH/temperature optima, and storage stability of both free and encapsulated enzymes were assessed.

Main Results:

• Optimized production of four key enzymes from a single Bacillus subtilis strain was achieved.
• Alginate encapsulation successfully enhanced the operational stability of the enzymes.
• Encapsulated enzymes exhibited wider active pH and temperature ranges and improved storage stability (60-74% activity retained) compared to free enzymes (34-42% activity retained) after 30 days at 4°C.

Conclusions:

• Alginate encapsulation is an effective strategy to improve the robustness and shelf-life of microbial enzymes.
• Simultaneous optimization and stabilization of multiple enzymes from one strain offer a novel approach for feed applications.
• Further in vivo studies are necessary to validate the efficacy of these stabilized enzymes in poultry feed.