Response surface optimization of medium components for naringinase production from Staphylococcus xylosus MAK2

Area of Science:

• Biotechnology
• Enzyme Engineering
• Microbial Fermentation

Background:

• Naringinase is a valuable enzyme with applications in various industries.
• Optimizing fermentation conditions is crucial for maximizing enzyme production.
• Staphylococcus xylosus is a potential host for naringinase production.

Purpose of the Study:

• To optimize the fermentation medium for enhanced naringinase production by Staphylococcus xylosus.
• To identify the key factors influencing naringinase production.
• To determine the optimal levels of these factors using response surface methodology.

Main Methods:

• Response surface methodology (RSM) was employed for optimization.
• Initial screening and optimization of medium components at shake flask level.
• A 2^2 full factorial central composite design (CCD) was used for further optimization.
• Multiple regression analysis was performed to derive a second-order polynomial model.

Main Results:

• Sucrose, sodium nitrate, pH, and naringin were identified as significant factors affecting naringinase production.
• Optimal medium components were determined as: sucrose (10.0%), sodium nitrate (10.0%), pH (5.6), biomass concentration (1.58%), and naringin (0.50%).
• Under optimal conditions, naringinase production reached 8.45 U/mL.
• High determination coefficients (R(2) > 0.99) indicated a reliable model for both naringinase activity and biomass production.

Conclusions:

• The optimized fermentation medium significantly enhanced naringinase production by Staphylococcus xylosus.
• Response surface methodology proved effective in determining optimal fermentation conditions.
• The developed model provides a reliable basis for large-scale naringinase production.