Enhancing nitrilase production from Fusarium proliferatum using response surface methodology

Area of Science:

• Biotechnology
• Enzyme Engineering
• Microbial Fermentation

Background:

• Nitrilase enzymes are crucial for various industrial applications, including nitrile hydrolysis.
• Optimizing microbial production of nitrilase is essential for cost-effective industrial processes.
• Fusarium proliferatum is a known source of nitrilase, but its production requires careful control of environmental factors.

Purpose of the Study:

• To investigate the individual and interactive effects of key nutrients and inducers on nitrilase production by Fusarium proliferatum.
• To determine the optimal conditions for maximizing nitrilase yield using statistical experimental design.
• To validate the predictive model and confirm the achieved increase in nitrilase activity.

Main Methods:

• Design of Experiments (DOE) methodology was employed to efficiently study multiple variables.
• Response Surface Methodology (RSM) with a Central Composite Design (CCD) was used to model and optimize the process.
• Statistical analysis (p<0.0001) was performed to validate the quadratic model's fit to experimental data.

Main Results:

• A quadratic model accurately described the relationship between carbon source (glucose), nitrogen source (sodium nitrate), and inducer (ϵ-caprolactam) concentrations and nitrilase production.
• Optimal conditions predicted were 53.22 g/l glucose, 2.31 g/l sodium nitrate, and 3.58 g/l ϵ-caprolactam for maximum nitrilase activity.
• Experimental validation confirmed the model's accuracy, yielding 58.3 U/g biomass, a 2.24-fold increase from the initial 26 U/g biomass.

Conclusions:

• The study successfully optimized nitrilase production in Fusarium proliferatum through systematic DOE and RSM.
• The identified optimal conditions provide a robust framework for enhanced industrial-scale nitrilase synthesis.
• This optimization significantly improves the efficiency and economic viability of using Fusarium proliferatum for nitrilase production.