Synthetic Optimization of Ferulic Acid/Curdlan Graft Copolymers
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Abstract:
A free-radical-mediated grafting method was used to prepare ferulic acid (FA)/curdlan graft copolymers. The effects of FA and vitamin C (Vc) addition, hydrogen peroxide (H2O2) concentration, and reaction time on the grafting ratio and yield of FA/curdlan graft copolymers were investigated using single factor experiments. Accordingly, the synthetic parameters of FA/curdlan graft copolymers were further optimized through orthogonal experiments. The results demonstrated that the optimal process conditions for the preparation of FA/curdlan graft copolymers included 25 mL of 5 mg/mL curdlan solution, 250 mg of FA, 50 mg of Vc, 5 mol/L H2O2, and a reaction time of 12 h. Under these conditions, the highest grafting rate and yield of the FA/curdlan graft copolymers of 98.62 mg FA/g and 40.84%, respectively, were obtained. Grafting was also confirmed by ultraviolet and infrared spectroscopy analyses. Therefore, the proposed preparation technique not only improved the physicochemical properties of curdlan, but also increased the grafting ratio of the graft copolymers. The findings of this study provide a theoretical foundation for the practical applications of curdlan in food industry.
