Sorbitol can be produced not only chemically but also biotechnologically

Area of Science:

• Biotechnology
• Industrial Microbiology
• Biochemical Engineering

Background:

• Sorbitol is a valuable polyol with diverse industrial applications, currently produced mainly through chemical synthesis.
• The bacterium Zymomonas mobilis possesses the unique enzyme glucose-fructose oxidoreductase, enabling sugar conversion.
• Exploring microbial production of sorbitol offers a sustainable alternative to chemical methods.

Purpose of the Study:

• To evaluate the potential of Zymomonas mobilis for industrial sorbitol production.
• To compare the microbial process with existing chemical and other microbiological methods.
• To assess the economic feasibility of this bioproduction route.

Main Methods:

• Utilizing Zymomonas mobilis for the one-step conversion of fructose and glucose into sorbitol and gluconic acid.
• Enzymatic analysis of glucose-fructose oxidoreductase activity.
• Process economics evaluation for industrial scale-up.

Main Results:

• Zymomonas mobilis efficiently produces sorbitol and gluconic acid from glucose and fructose in a single step.
• The microbial process yields ethanol as a significant byproduct.
• Economic analysis indicates potential viability for sorbitol and ethanol production in specific regions.

Conclusions:

• The Zymomonas mobilis-based bioproduction of sorbitol presents a promising alternative to chemical synthesis.
• Ethanol is a valuable co-product, enhancing the economic potential of the process.
• Further research is needed to optimize the utilization or substitution of the gluconic acid byproduct.