Production of D-mannitol by conidia of Aspergillus candidus

Area of Science:

• Microbiology
• Biochemistry
• Industrial Biotechnology

Background:

• * Aspergillus candidus is a filamentous fungus known for its metabolic capabilities.
• * Mannitol production is a significant bioprocess with various industrial applications.
• * Understanding the optimal conditions for fungal sugar metabolism is crucial for efficient bioconversion.

Purpose of the Study:

• * To investigate the conversion of glucose and other sugars to mannitol by Aspergillus candidus conidia.
• * To determine the effect of pH on both the yield and rate of mannitol fermentation.

Main Methods:

• * Cultivation of Aspergillus candidus conidia.
• * Fermentation of sugars (glucose and others) under controlled conditions.
• * Measurement of mannitol production and fermentation rate at varying pH levels (specifically around pH 3.0).

Main Results:

• * Aspergillus candidus conidia successfully converted glucose and other sugars into mannitol.
• * A low pH environment (approximately 3.0) was found to enhance the percentage yield of mannitol.
• * The fermentation rate, however, was observed to decrease at this low pH.

Conclusions:

• * Aspergillus candidus is a viable microorganism for mannitol production from various sugars.
• * Optimizing pH is critical for mannitol fermentation, balancing yield and process efficiency.
• * Further research can explore strategies to mitigate the reduced fermentation rate at low pH for industrial scalability.