Xylanolytic complex from Aspergillus giganteus: production and characterization.

Area of Science:

• Microbiology
• Enzymology
• Biotechnology

Background:

• Xylanase enzymes are crucial for breaking down xylan, a major component of plant cell walls.
• Industrial applications require enzymes with specific activity profiles and stability under process conditions.
• Aspergillus giganteus is explored for its potential as a microbial source of industrial enzymes.

Purpose of the Study:

• To isolate and characterize a high-yield xylanase-producing strain of Aspergillus giganteus.
• To optimize conditions for xylanase production and activity.
• To evaluate the enzyme's stability and potential industrial applicability.

Main Methods:

• Isolation and screening of Aspergillus giganteus for xylanase production.
• Optimization of fermentation parameters (medium, pH, temperature, time, carbon source).
• Enzyme activity assays, thermal stability tests, pH stability tests, and product hydrolysis analysis.

Main Results:

• Aspergillus giganteus demonstrated excellent xylanase production with low cellulase activity.
• Optimal production occurred in Vogel medium with xylan at pH 6.5-7.0, 25°C, 120 rpm for 84 hours.
• Optimal activity was at 50°C and pH 6.0, with high stability from pH 4.5-10.5, indicating potential for alkaline industrial processes.
• Enzyme showed low thermal stability but was inhibited by Hg(+2), Cu(+2), and SDS.
• Hydrolysis products indicated endoxylanase activity without significant debranching or beta-xylosidase activity.

Conclusions:

• Aspergillus giganteus is a promising source of endoxylanase with potential for industrial use, particularly in alkaline conditions.
• Further research could focus on enhancing thermal stability or using the enzyme in specific industrial applications.
• The characterized enzyme profile provides valuable data for biotechnological applications requiring specific xylanolytic activity.