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Design of Solid-State Fermentation Systems for Polymer Hydrolytic Extracellular Enzyme Production by Filamentous Fungi

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Response surface methodology for optimizing the fermentation medium of alpha-galactosidase in solid-state

C Q Liu¹, Q H Chen, B Tang

¹Department of Food Science and Nutrition, Zhejiang University, Hangzhou 310029, China.

Letters in Applied Microbiology

|July 27, 2007

Summary

This study optimized alpha-galactosidase production using Aspergillus foetidus in solid-state fermentation (SSF). The developed medium significantly increased enzyme activity, paving the way for industrial applications in food and feed industries.

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Area of Science:

Biotechnology
Enzyme Engineering
Industrial Microbiology

Background:

Alpha-galactosidase hydrolyzes raffinose oligosaccharides (RO), reducing flatulence from soybean products.
Current methods for alpha-galactosidase production require optimization for industrial efficiency.

Purpose of the Study:

To develop an optimal culture medium for alpha-galactosidase production by Aspergillus foetidus using solid-state fermentation (SSF).
To enhance enzyme yield for industrial applications in the food and feed sectors.

Main Methods:

Response Surface Methodology (RSM) and Central Composite Design (CCD) were employed to optimize fermentation medium composition.
Fractional Factorial Design (FFD) was used to identify key factors influencing enzyme production.
Key components optimized included wheat bran, soybean meal, KH(2)PO(4), MnSO(4).H(2)O, and CuSO(4).5H(2)O.

Main Results:

The optimal fermentation medium comprised 8.2137 g wheat bran, 1.7843 g soybean meal, 0.001 g MnSO(4).H(2)O, and 0.001 g CuSO(4).5H(2)O per 10 g dry matter.
Predicted alpha-galactosidase activity reached 2210.76 U g(-1) dry matter after 96 h incubation.
Actual achieved activity was 2207.19 U g(-1) dry matter, validating the optimized medium.

Conclusions:

Optimization of the solid substrate is crucial for increasing alpha-galactosidase activity.
The developed SSF process shows potential for scale-up and industrial production of alpha-galactosidase.
This research contributes to improving the utilization of soybean-derived products by reducing associated digestive discomfort.