Optimization of oligosaccharide synthesis from cellobiose by dextransucrase

Area of Science:

• Carbohydrate Chemistry
• Enzymology
• Biotechnology

Background:

• Oligosaccharides are increasingly sought after in food and pharmaceuticals for their prebiotic, sweetener, and immunostimulating properties.
• Novel carbohydrate-based products are favored due to low toxicity and minimal immune response.
• Cellobiose, a nondigestible sugar, presents potential for developing new functional ingredients.

Purpose of the Study:

• To produce a series of cellobio-oligosaccharides using cellobiose as an acceptor and sucrose as a donor.
• To optimize the enzymatic reaction catalyzed by dextransucrase from Leuconostoc mesenteroides B-512FMCM for maximum oligosaccharide yield.

Main Methods:

• Enzymatic synthesis involving cellobiose (acceptor) and sucrose (donor) catalyzed by dextransucrase.
• Optimization of reaction conditions using a Box-Behnken experimental design.
• Specific conditions tested: 289 mM sucrose, 250 mM cellobiose, 54 U enzyme activity, pH 5.2, and 30°C.

Main Results:

• Successful production of a series of cellobio-oligosaccharides.
• Identified optimal conditions for maximizing oligosaccharide yield.
• The optimized system achieved high yields under specific substrate concentrations, enzyme load, pH, and temperature.

Conclusions:

• The enzymatic production of cellobio-oligosaccharides is feasible and can be optimized for industrial applications.
• Optimized conditions provide a pathway for efficient synthesis of valuable oligosaccharides.
• This study contributes to the development of novel functional ingredients for the food and pharmaceutical sectors.