New Polycationic Arabinogalactan Derivatives with the CHPTAC System: Structure, Properties and Antioxidant Activity

Area of Science:

• Polymer Chemistry
• Materials Science
• Biochemistry

Background:

• Arabinogalactan (AG) is a natural polysaccharide with potential applications.
• Modifying AG can enhance its functional properties for various uses.
• Quaternization introduces cationic groups, altering polysaccharide characteristics.

Purpose of the Study:

• To synthesize cationic arabinogalactan (AG) derivatives.
• To investigate the impact of quaternization on AG properties.
• To evaluate the antioxidant capacity of the modified AG.

Main Methods:

• Etherification of AG using (3-Chloro-2-hydroxypropyl)-trimethylammonium chloride (CHPTAC).
• Control of degree of substitution (DS) via pH and reaction time.
• Characterization using elemental analysis, GPC, FTIR, 1H NMR, and TGA.
• Antioxidant activity assessed via DPPH free radical scavenging assay.

Main Results:

• Cationic AG derivatives with DS ranging from 0.02 to 0.19 were successfully prepared.
• Optimal quaternization conditions determined: pH 12, 50°C, and 31.6 hours.
• Quaternized AGs exhibited improved antioxidant capacity compared to unmodified AG.
• Hydrolysis side reactions observed with prolonged reaction times.

Conclusions:

• The study successfully produced cationic AG derivatives with tunable properties.
• Optimized synthesis conditions enhance the efficiency of quaternization.
• The modified AGs show promise as antioxidants.
• Understanding reaction kinetics is crucial to minimize side reactions.