Synthesis and Functional Characterization of Caffeic Acid Glucoside Using Leuconostoc mesenteroides Dextransucrase

Area of Science:

• Biochemistry
• Food Science
• Pharmacology

Background:

• Caffeic acid is a phenolic compound with various health benefits but limited solubility and stability.
• Enhancing the properties of caffeic acid can expand its applications in food and pharmaceuticals.

Purpose of the Study:

• To enzymatically synthesize and characterize a novel caffeic acid glucoside.
• To evaluate the improved functional properties of the synthesized caffeic acid glucoside compared to native caffeic acid.

Main Methods:

• Transglucosylation of caffeic acid using sucrose and dextransucrase from Leuconostoc mesenteroides.
• Isolation and purification of the caffeic acid glucoside via butanol separation, silica gel chromatography, and preparative HPLC.
• Structural identification using mass spectrometry and optimization of production conditions.

Main Results:

• Successfully synthesized and identified caffeic acid-3-O-α-d-glucopyranoside.
• Optimized production yielded 153 mM of the glucoside with specific enzyme and substrate concentrations.
• The glucoside exhibited significantly enhanced water solubility, antilipid peroxidation activity, colon cancer cell growth inhibition, and browning resistance compared to caffeic acid.

Conclusions:

• Caffeic acid-3-O-α-d-glucopyranoside demonstrates superior functional properties over native caffeic acid.
• The enhanced characteristics suggest its potential as a valuable functional ingredient in food and pharmaceutical products.
• Enzymatic modification offers a viable strategy for improving the bioavailability and efficacy of phenolic compounds.