Efficient production of protopectinases by Bacillus subtilis using medium based on soybean flour

Area of Science:

• Biotechnology
• Enzyme Technology
• Industrial Microbiology

Background:

• Protopectinases (PPases) are enzymes with pectin-releasing activity.
• PPases have potential applications in enzymatic cotton scouring.
• Bacillus subtilis is a known microbial producer of various enzymes.

Purpose of the Study:

• To develop an efficient culture system for Bacillus subtilis protopectinase production.
• To investigate the impact of soybean flour treatments and concentrations on PPase yield.
• To optimize conditions for high pectin-releasing activity relevant to industrial applications.

Main Methods:

• Cultivation of Bacillus subtilis IFO3134 using defatted soybean flour as a primary medium component.
• Investigation of alkaline solubilization and autoclaving treatments for nutrient extraction from soybean flour.
• Batch fermentation experiments varying initial soybean flour concentrations (20-80 g/l).

Main Results:

• Bacillus subtilis produced three types of PPases: PPase-C (endo-arabinase), PPase-N (pectate-lyase), and PPase-R (pectin-lyase).
• Alkaline solubilization of soybean flour significantly reduced enzyme productivity.
• Optimal PPase production (2200-2400 U/ml) was achieved with 40 g/l soybean flour, autoclaved for 45-60 min without alkaline treatment.

Conclusions:

• Optimized fermentation conditions enhance protopectinase production in Bacillus subtilis.
• Autoclaving soybean flour without alkaline treatment is crucial for maximizing PPase yield.
• The developed system provides a high-activity pectin-releasing enzyme suitable for enzymatic cotton scouring.